greenplumn CTranslatorDXLToScalar 源码

  • 2022-08-18
  • 浏览 (313)

greenplumn CTranslatorDXLToScalar 代码

文件路径:/src/backend/gpopt/translate/CTranslatorDXLToScalar.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//
//	@filename:
//		CTranslatorDXLToScalar.cpp
//
//	@doc:
//		Implementation of the methods used to translate DXL Scalar Node into
//		GPDB's Expr.
//
//	@test:
//---------------------------------------------------------------------------

extern "C" {
#include "postgres.h"

#include "catalog/pg_collation.h"
#include "nodes/makefuncs.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/plannodes.h"
#include "nodes/primnodes.h"
#include "utils/datum.h"
}

#include <vector>

#include "gpos/base.h"

#include "gpopt/base/COptCtxt.h"
#include "gpopt/gpdbwrappers.h"
#include "gpopt/mdcache/CMDAccessor.h"
#include "gpopt/mdcache/CMDAccessorUtils.h"
#include "gpopt/translate/CMappingColIdVarPlStmt.h"
#include "gpopt/translate/CTranslatorDXLToPlStmt.h"
#include "gpopt/translate/CTranslatorDXLToScalar.h"
#include "gpopt/translate/CTranslatorUtils.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLDatumBool.h"
#include "naucrates/dxl/operators/CDXLDatumGeneric.h"
#include "naucrates/dxl/operators/CDXLDatumInt2.h"
#include "naucrates/dxl/operators/CDXLDatumInt4.h"
#include "naucrates/dxl/operators/CDXLDatumInt8.h"
#include "naucrates/dxl/operators/CDXLDatumOid.h"
#include "naucrates/dxl/operators/CDXLScalarAggref.h"
#include "naucrates/dxl/operators/CDXLScalarArray.h"
#include "naucrates/dxl/operators/CDXLScalarArrayCoerceExpr.h"
#include "naucrates/dxl/operators/CDXLScalarArrayComp.h"
#include "naucrates/dxl/operators/CDXLScalarArrayRef.h"
#include "naucrates/dxl/operators/CDXLScalarBoolExpr.h"
#include "naucrates/dxl/operators/CDXLScalarBooleanTest.h"
#include "naucrates/dxl/operators/CDXLScalarCaseTest.h"
#include "naucrates/dxl/operators/CDXLScalarCoalesce.h"
#include "naucrates/dxl/operators/CDXLScalarCoerceToDomain.h"
#include "naucrates/dxl/operators/CDXLScalarCoerceViaIO.h"
#include "naucrates/dxl/operators/CDXLScalarDistinctComp.h"
#include "naucrates/dxl/operators/CDXLScalarFuncExpr.h"
#include "naucrates/dxl/operators/CDXLScalarIfStmt.h"
#include "naucrates/dxl/operators/CDXLScalarMinMax.h"
#include "naucrates/dxl/operators/CDXLScalarNullIf.h"
#include "naucrates/dxl/operators/CDXLScalarNullTest.h"
#include "naucrates/dxl/operators/CDXLScalarOpExpr.h"
#include "naucrates/dxl/operators/CDXLScalarSortGroupClause.h"
#include "naucrates/dxl/operators/CDXLScalarSwitch.h"
#include "naucrates/dxl/operators/CDXLScalarValuesList.h"
#include "naucrates/dxl/operators/CDXLScalarWindowRef.h"
#include "naucrates/dxl/xml/dxltokens.h"
#include "naucrates/exception.h"
#include "naucrates/md/IMDAggregate.h"
#include "naucrates/md/IMDFunction.h"
#include "naucrates/md/IMDScalarOp.h"
#include "naucrates/md/IMDTypeBool.h"

using namespace gpdxl;
using namespace gpos;
using namespace gpopt;


//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::CTranslatorDXLToScalar
//
//	@doc:
//		Constructor
//---------------------------------------------------------------------------
CTranslatorDXLToScalar::CTranslatorDXLToScalar(CMemoryPool *mp,
											   CMDAccessor *md_accessor,
											   ULONG num_segments)
	: m_mp(mp),
	  m_md_accessor(md_accessor),
	  m_has_subqueries(false),
	  m_num_of_segments(num_segments)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLToScalar
//
//	@doc:
//		Translates a DXL scalar expression into a GPDB Expression node
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLToScalar(const CDXLNode *dxlnode,
											 CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != dxlnode);
	Edxlopid eopid = dxlnode->GetOperator()->GetDXLOperator();
	switch (eopid)
	{
		default:
		{
			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXL2PlStmtConversion,
					   dxlnode->GetOperator()->GetOpNameStr()->GetBuffer());
		}
		case EdxlopScalarIdent:
		{
			return TranslateDXLScalarIdentToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCmp:
		{
			return TranslateDXLScalarCmpToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarDistinct:
		{
			return TranslateDXLScalarDistinctToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarOpExpr:
		{
			return TranslateDXLScalarOpExprToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarArrayComp:
		{
			return TranslateDXLScalarArrayCompToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCoalesce:
		{
			return TranslateDXLScalarCoalesceToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarMinMax:
		{
			return TranslateDXLScalarMinMaxToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarConstValue:
		{
			return TranslateDXLScalarConstToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarBoolExpr:
		{
			return TranslateDXLScalarBoolExprToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarBooleanTest:
		{
			return TranslateDXLScalarBooleanTestToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarNullTest:
		{
			return TranslateDXLScalarNullTestToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarNullIf:
		{
			return TranslateDXLScalarNullIfToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarIfStmt:
		{
			return TranslateDXLScalarIfStmtToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarSwitch:
		{
			return TranslateDXLScalarSwitchToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCaseTest:
		{
			return TranslateDXLScalarCaseTestToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarFuncExpr:
		{
			return TranslateDXLScalarFuncExprToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarAggref:
		{
			return TranslateDXLScalarAggrefToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarWindowRef:
		{
			return TranslateDXLScalarWindowRefToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCast:
		{
			return TranslateDXLScalarCastToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCoerceToDomain:
		{
			return TranslateDXLScalarCoerceToDomainToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarCoerceViaIO:
		{
			return TranslateDXLScalarCoerceViaIOToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarArrayCoerceExpr:
		{
			return TranslateDXLScalarArrayCoerceExprToScalar(dxlnode,
															 colid_var);
		}
		case EdxlopScalarSubPlan:
		{
			return TranslateDXLScalarSubplanToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarArray:
		{
			return TranslateDXLScalarArrayToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarArrayRef:
		{
			return TranslateDXLScalarArrayRefToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarDMLAction:
		{
			return TranslateDXLScalarDMLActionToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarValuesList:
		{
			return TranslateDXLScalarValuesListToScalar(dxlnode, colid_var);
		}
		case EdxlopScalarSortGroupClause:
		{
			return TranslateDXLScalarSortGroupClauseToScalar(dxlnode,
															 colid_var);
		}
#if 0
		// GPDB_12_MERGE_FIXME: These were removed from the server with the v12 merge
		// of upstream partitioning. Need something to replace? Need to rip out from GPORCA?
		case EdxlopScalarPartDefault: { return TranslateDXLScalarPartDefaultToScalar(dxlnode, colid_var); }
		case EdxlopScalarPartBound: { return TranslateDXLScalarPartBoundToScalar(dxlnode, colid_var); }
		case EdxlopScalarPartBoundInclusion: { return TranslateDXLScalarPartBoundInclusionToScalar(dxlnode, colid_var); }
		case EdxlopScalarPartBoundOpen: { return TranslateDXLScalarPartBoundOpenToScalar(dxlnode, colid_var); }
		case EdxlopScalarPartListValues: { return TranslateDXLScalarPartListValuesToScalar(dxlnode, colid_var); }
		case EdxlopScalarPartListNullTest: { return TranslateDXLScalarPartListNullTestToScalar(dxlnode, colid_var); }
#endif
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarIfStmtToScalar
//
//	@doc:
//		Translates a DXL scalar if stmt into a GPDB CaseExpr node
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarIfStmtToScalar(
	const CDXLNode *scalar_if_stmt_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_if_stmt_node);
	CDXLScalarIfStmt *scalar_if_stmt_dxl =
		CDXLScalarIfStmt::Cast(scalar_if_stmt_node->GetOperator());

	CaseExpr *case_expr = MakeNode(CaseExpr);
	case_expr->casetype =
		CMDIdGPDB::CastMdid(scalar_if_stmt_dxl->GetResultTypeMdId())->Oid();
	// GPDB_91_MERGE_FIXME: collation
	case_expr->casecollid = gpdb::TypeCollation(case_expr->casetype);

	CDXLNode *curr_node = const_cast<CDXLNode *>(scalar_if_stmt_node);
	Expr *else_expr = nullptr;

	// An If statement is of the format: IF <condition> <then> <else>
	// The leaf else statement is the def result of the case statement
	BOOL is_leaf_else_stmt = false;

	while (!is_leaf_else_stmt)
	{
		if (3 != curr_node->Arity())
		{
			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLIncorrectNumberOfChildren);
			return nullptr;
		}

		Expr *when_expr = TranslateDXLToScalar((*curr_node)[0], colid_var);
		Expr *then_expr = TranslateDXLToScalar((*curr_node)[1], colid_var);

		CaseWhen *case_when = MakeNode(CaseWhen);
		case_when->expr = when_expr;
		case_when->result = then_expr;
		case_expr->args = gpdb::LAppend(case_expr->args, case_when);

		if (EdxlopScalarIfStmt ==
			(*curr_node)[2]->GetOperator()->GetDXLOperator())
		{
			curr_node = (*curr_node)[2];
		}
		else
		{
			is_leaf_else_stmt = true;
			else_expr = TranslateDXLToScalar((*curr_node)[2], colid_var);
		}
	}

	case_expr->defresult = else_expr;

	return (Expr *) case_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarSwitchToScalar
//
//	@doc:
//		Translates a DXL scalar switch into a GPDB CaseExpr node
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarSwitchToScalar(
	const CDXLNode *scalar_switch_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_switch_node);
	CDXLScalarSwitch *dxlop =
		CDXLScalarSwitch::Cast(scalar_switch_node->GetOperator());

	CaseExpr *case_expr = MakeNode(CaseExpr);
	case_expr->casetype = CMDIdGPDB::CastMdid(dxlop->MdidType())->Oid();
	// GPDB_91_MERGE_FIXME: collation
	case_expr->casecollid = gpdb::TypeCollation(case_expr->casetype);

	// translate arg child
	case_expr->arg = TranslateDXLToScalar((*scalar_switch_node)[0], colid_var);
	GPOS_ASSERT(nullptr != case_expr->arg);

	const ULONG arity = scalar_switch_node->Arity();
	GPOS_ASSERT(1 < arity);
	for (ULONG ul = 1; ul < arity; ul++)
	{
		const CDXLNode *child_dxl = (*scalar_switch_node)[ul];

		if (EdxlopScalarSwitchCase ==
			child_dxl->GetOperator()->GetDXLOperator())
		{
			CaseWhen *case_when = MakeNode(CaseWhen);
			case_when->expr = TranslateDXLToScalar((*child_dxl)[0], colid_var);
			case_when->result =
				TranslateDXLToScalar((*child_dxl)[1], colid_var);
			case_expr->args = gpdb::LAppend(case_expr->args, case_when);
		}
		else
		{
			// default return value
			GPOS_ASSERT(ul == arity - 1);
			case_expr->defresult =
				TranslateDXLToScalar((*scalar_switch_node)[ul], colid_var);
		}
	}

	return (Expr *) case_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarCaseTestToScalar
//
//	@doc:
//		Translates a DXL scalar case test into a GPDB CaseTestExpr node
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCaseTestToScalar(
	const CDXLNode *scalar_case_test_node,
	CMappingColIdVar *	//colid_var
)
{
	GPOS_ASSERT(nullptr != scalar_case_test_node);
	CDXLScalarCaseTest *dxlop =
		CDXLScalarCaseTest::Cast(scalar_case_test_node->GetOperator());

	CaseTestExpr *case_test_expr = MakeNode(CaseTestExpr);
	case_test_expr->typeId = CMDIdGPDB::CastMdid(dxlop->MdidType())->Oid();
	case_test_expr->typeMod = -1;
	// GPDB_91_MERGE_FIXME: collation
	case_test_expr->collation = gpdb::TypeCollation(case_test_expr->typeId);

	return (Expr *) case_test_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarOpExprToScalar
//
//	@doc:
//		Translates a DXL scalar opexpr into a GPDB OpExpr node
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarOpExprToScalar(
	const CDXLNode *scalar_op_expr_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_op_expr_node);
	CDXLScalarOpExpr *scalar_op_expr_dxl =
		CDXLScalarOpExpr::Cast(scalar_op_expr_node->GetOperator());

	OpExpr *op_expr = MakeNode(OpExpr);
	op_expr->opno = CMDIdGPDB::CastMdid(scalar_op_expr_dxl->MDId())->Oid();

	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(scalar_op_expr_dxl->MDId());
	op_expr->opfuncid = CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();

	IMDId *return_type_mdid = scalar_op_expr_dxl->GetReturnTypeMdId();
	if (nullptr != return_type_mdid)
	{
		op_expr->opresulttype = CMDIdGPDB::CastMdid(return_type_mdid)->Oid();
	}
	else
	{
		op_expr->opresulttype =
			GetFunctionReturnTypeOid(md_scalar_op->FuncMdId());
	}

	const IMDFunction *md_func =
		m_md_accessor->RetrieveFunc(md_scalar_op->FuncMdId());
	op_expr->opretset = md_func->ReturnsSet();

	GPOS_ASSERT(1 == scalar_op_expr_node->Arity() ||
				2 == scalar_op_expr_node->Arity());

	// translate children
	op_expr->args =
		TranslateScalarChildren(op_expr->args, scalar_op_expr_node, colid_var);

	// GPDB_91_MERGE_FIXME: collation
	op_expr->inputcollid = gpdb::ExprCollation((Node *) op_expr->args);
	op_expr->opcollid = gpdb::TypeCollation(op_expr->opresulttype);

	return (Expr *) op_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarArrayCompToScalar
//
//	@doc:
//		Translates a CDXLScalarArrayComp into a GPDB ScalarArrayOpExpr
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarArrayCompToScalar(
	const CDXLNode *scalar_array_comp_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_array_comp_node);
	CDXLScalarArrayComp *array_comp_dxl =
		CDXLScalarArrayComp::Cast(scalar_array_comp_node->GetOperator());

	ScalarArrayOpExpr *array_op_expr = MakeNode(ScalarArrayOpExpr);
	array_op_expr->opno = CMDIdGPDB::CastMdid(array_comp_dxl->MDId())->Oid();
	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(array_comp_dxl->MDId());
	array_op_expr->opfuncid =
		CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();

	switch (array_comp_dxl->GetDXLArrayCmpType())
	{
		case Edxlarraycomptypeany:
			array_op_expr->useOr = true;
			break;

		case Edxlarraycomptypeall:
			array_op_expr->useOr = false;
			break;

		default:
			GPOS_RAISE(
				gpdxl::ExmaDXL, gpdxl::ExmiPlStmt2DXLConversion,
				GPOS_WSZ_LIT(
					"Scalar Array Comparison: Specified operator type is invalid"));
	}

	// translate left and right child

	GPOS_ASSERT(2 == scalar_array_comp_node->Arity());

	CDXLNode *left_node = (*scalar_array_comp_node)[EdxlsccmpIndexLeft];
	CDXLNode *right_node = (*scalar_array_comp_node)[EdxlsccmpIndexRight];

	Expr *left_expr = TranslateDXLToScalar(left_node, colid_var);
	Expr *right_expr = TranslateDXLToScalar(right_node, colid_var);

	array_op_expr->args = ListMake2(left_expr, right_expr);
	// GPDB_91_MERGE_FIXME: collation
	array_op_expr->inputcollid =
		gpdb::ExprCollation((Node *) array_op_expr->args);

	return (Expr *) array_op_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarDistinctToScalar
//
//	@doc:
//		Translates a DXL scalar distinct comparison into a GPDB DistinctExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarDistinctToScalar(
	const CDXLNode *scalar_distinct_cmp_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_distinct_cmp_node);
	CDXLScalarDistinctComp *dxlop =
		CDXLScalarDistinctComp::Cast(scalar_distinct_cmp_node->GetOperator());

	DistinctExpr *dist_expr = MakeNode(DistinctExpr);
	dist_expr->opno = CMDIdGPDB::CastMdid(dxlop->MDId())->Oid();

	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(dxlop->MDId());

	dist_expr->opfuncid = CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();
	dist_expr->opresulttype =
		GetFunctionReturnTypeOid(md_scalar_op->FuncMdId());

	// translate left and right child
	GPOS_ASSERT(2 == scalar_distinct_cmp_node->Arity());
	CDXLNode *left_node = (*scalar_distinct_cmp_node)[EdxlscdistcmpIndexLeft];
	CDXLNode *right_node = (*scalar_distinct_cmp_node)[EdxlscdistcmpIndexRight];

	Expr *left_expr = TranslateDXLToScalar(left_node, colid_var);
	Expr *right_expr = TranslateDXLToScalar(right_node, colid_var);

	dist_expr->args = ListMake2(left_expr, right_expr);
	// GPDB_91_MERGE_FIXME: collation
	dist_expr->opcollid = gpdb::TypeCollation(dist_expr->opresulttype);
	dist_expr->inputcollid = gpdb::ExprCollation((Node *) dist_expr->args);

	return (Expr *) dist_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarAggrefToScalar
//
//	@doc:
//		Translates a DXL scalar aggref_node into a GPDB Aggref node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarAggrefToScalar(
	const CDXLNode *aggref_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != aggref_node);
	CDXLScalarAggref *dxlop =
		CDXLScalarAggref::Cast(aggref_node->GetOperator());

	Aggref *aggref = MakeNode(Aggref);
	aggref->aggfnoid = CMDIdGPDB::CastMdid(dxlop->GetDXLAggFuncMDid())->Oid();
	aggref->aggdistinct = NIL;
	aggref->agglevelsup = 0;
	aggref->aggkind = 'n';
	aggref->location = -1;
	aggref->aggtranstype = InvalidOid;
	aggref->aggargtypes = NIL;

	CMDIdGPDB *agg_mdid = GPOS_NEW(m_mp) CMDIdGPDB(aggref->aggfnoid);
	const IMDAggregate *pmdagg = m_md_accessor->RetrieveAgg(agg_mdid);
	agg_mdid->Release();

	EdxlAggrefStage edxlaggstage = dxlop->GetDXLAggStage();
	if (nullptr != dxlop->GetDXLResolvedRetTypeMDid())
	{
		// use resolved type
		aggref->aggtype =
			CMDIdGPDB::CastMdid(dxlop->GetDXLResolvedRetTypeMDid())->Oid();
	}
	else if (EdxlaggstageIntermediate == edxlaggstage ||
			 EdxlaggstagePartial == edxlaggstage)
	{
		aggref->aggtype =
			CMDIdGPDB::CastMdid(pmdagg->GetIntermediateResultTypeMdid())->Oid();
	}
	else
	{
		aggref->aggtype =
			CMDIdGPDB::CastMdid(pmdagg->GetResultTypeMdid())->Oid();
	}

	switch (dxlop->GetDXLAggStage())
	{
		case EdxlaggstageNormal:
			aggref->aggsplit = AGGSPLIT_SIMPLE;
			break;
		case EdxlaggstagePartial:
			aggref->aggsplit = AGGSPLIT_INITIAL_SERIAL;
			break;
		case EdxlaggstageIntermediate:
			aggref->aggsplit = AGGSPLIT_INTERNMEDIATE;
			break;
		case EdxlaggstageFinal:
			aggref->aggsplit = AGGSPLIT_FINAL_DESERIAL;
			break;
		default:
			GPOS_RAISE(
				gpdxl::ExmaDXL, gpdxl::ExmiPlStmt2DXLConversion,
				GPOS_WSZ_LIT("AGGREF: Specified AggStage value is invalid"));
	}

	// translate each DXL argument
	List *args = TranslateScalarListChildren(
		(*aggref_node)[EdxlscalaraggrefIndexArgs], colid_var);
	aggref->aggdirectargs = TranslateScalarListChildren(
		(*aggref_node)[EdxlscalaraggrefIndexDirectArgs], colid_var);
	aggref->aggorder = TranslateScalarListChildren(
		(*aggref_node)[EdxlscalaraggrefIndexAggOrder], colid_var);

	aggref->aggkind = CTranslatorUtils::GetAggKind(dxlop->GetAggKind());

	// 'indexes' stores the position of the TargetEntry which is referenced by
	// a SortGroupClause.
	std::vector<int> indexes(gpdb::ListLength(args) + 1, -1);

	{
		int i;
		ListCell *lc;
		ForEachWithCount(lc, aggref->aggorder, i)
		{
			SortGroupClause *gc = (SortGroupClause *) lfirst(lc);
			indexes[gc->tleSortGroupRef] = gc->tleSortGroupRef;

			// 'indexes' values are zero-based, but zero means TargetEntry
			// doesn't have corresponding SortGroupClause. So convert back to
			// one-based.
			gc->tleSortGroupRef += 1;
		}
	}
	if (dxlop->IsDistinct())
	{
		List *aggdistinct = TranslateScalarListChildren(
			(*aggref_node)[EdxlscalaraggrefIndexAggDistinct], colid_var);

		ULONG i;
		ListCell *lc;
		ForEachWithCount(lc, aggdistinct, i)
		{
			if (i >= gpdb::ListLength(args))
			{
				break;
			}

			SortGroupClause *gc = (SortGroupClause *) lfirst(lc);
			indexes[gc->tleSortGroupRef] = gc->tleSortGroupRef;

			// 'indexes' values are zero-based, but zero means TargetEntry
			// doesn't have corresponding SortGroupClause. So convert back to
			// one-based.
			gc->tleSortGroupRef += 1;

			aggref->aggdistinct = gpdb::LAppend(aggref->aggdistinct, gc);
		}
	}

	int attno;
	aggref->args = NIL;
	ListCell *lc;
	ForEachWithCount(lc, args, attno)
	{
		TargetEntry *new_target_entry = gpdb::MakeTargetEntry(
			(Expr *) lfirst(lc), attno + 1, nullptr, false);

		aggref->args = gpdb::LAppend(aggref->args, new_target_entry);
		if (gpdb::ListLength(aggref->aggorder) > 0 ||
			gpdb::ListLength(aggref->aggdistinct) > 0)
		{
			new_target_entry->ressortgroupref =
				indexes[attno] == -1 ? 0 : (indexes[attno] + 1);
		}
	}

	ULongPtrArray *argtypes = dxlop->GetArgTypes();
	for (ULONG ul = 0; ul < argtypes->Size(); ul++)
	{
		aggref->aggargtypes =
			gpdb::LAppendOid(aggref->aggargtypes, *(*argtypes)[ul]);
	}

	/*
	 * Resolve the possibly-polymorphic aggregate transition type.
	 */
	Oid aggtranstype;
	Oid inputTypes[FUNC_MAX_ARGS];
	int numArguments;

	aggtranstype = gpdb::GetAggIntermediateResultType(aggref->aggfnoid);

	/* extract argument types (ignoring any ORDER BY expressions) */
	numArguments = gpdb::GetAggregateArgTypes(aggref, inputTypes);

	/* resolve actual type of transition state, if polymorphic */
	aggtranstype = gpdb::ResolveAggregateTransType(
		aggref->aggfnoid, aggtranstype, inputTypes, numArguments);
	aggref->aggtranstype = aggtranstype;

	// GPDB_91_MERGE_FIXME: collation
	aggref->inputcollid = gpdb::ExprCollation((Node *) args);
	aggref->aggcollid = gpdb::TypeCollation(aggref->aggtype);

	return (Expr *) aggref;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarWindowRefToScalar
//
//	@doc:
//		Translate a DXL scalar window ref into a GPDB WindowRef node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarWindowRefToScalar(
	const CDXLNode *scalar_winref_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_winref_node);
	CDXLScalarWindowRef *dxlop =
		CDXLScalarWindowRef::Cast(scalar_winref_node->GetOperator());

	WindowFunc *window_func = MakeNode(WindowFunc);
	window_func->winfnoid = CMDIdGPDB::CastMdid(dxlop->FuncMdId())->Oid();

	window_func->windistinct = dxlop->IsDistinct();
	window_func->location = -1;
	window_func->winref = dxlop->GetWindSpecPos() + 1;
	window_func->wintype = CMDIdGPDB::CastMdid(dxlop->ReturnTypeMdId())->Oid();
	window_func->winstar = dxlop->IsStarArg();
	window_func->winagg = dxlop->IsSimpleAgg();

	if (dxlop->GetDxlWinStage() != EdxlwinstageImmediate)
	{
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiQuery2DXLError,
				   GPOS_WSZ_LIT("Unsupported window function stage"));
	}

	// translate the arguments of the window function
	window_func->args = TranslateScalarChildren(window_func->args,
												scalar_winref_node, colid_var);
	// GPDB_91_MERGE_FIXME: collation
	window_func->wincollid = gpdb::TypeCollation(window_func->wintype);
	window_func->inputcollid = gpdb::ExprCollation((Node *) window_func->args);

	return (Expr *) window_func;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarFuncExprToScalar
//
//	@doc:
//		Translates a DXL scalar opexpr into a GPDB FuncExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarFuncExprToScalar(
	const CDXLNode *scalar_func_expr_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_func_expr_node);
	CDXLScalarFuncExpr *dxlop =
		CDXLScalarFuncExpr::Cast(scalar_func_expr_node->GetOperator());

	FuncExpr *func_expr = MakeNode(FuncExpr);
	func_expr->funcid = CMDIdGPDB::CastMdid(dxlop->FuncMdId())->Oid();
	func_expr->funcretset = dxlop->ReturnsSet();
	func_expr->funcformat = COERCE_EXPLICIT_CALL;
	func_expr->funcresulttype =
		CMDIdGPDB::CastMdid(dxlop->ReturnTypeMdId())->Oid();
	func_expr->args = TranslateScalarChildren(func_expr->args,
											  scalar_func_expr_node, colid_var);

	// GPDB_91_MERGE_FIXME: collation
	func_expr->inputcollid = gpdb::ExprCollation((Node *) func_expr->args);
	func_expr->funccollid = gpdb::TypeCollation(func_expr->funcresulttype);

	return (Expr *) func_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarSubplanToScalar
//
//	@doc:
//		Translates a DXL scalar SubPlan into a GPDB SubPlan node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarSubplanToScalar(
	const CDXLNode *scalar_subplan_node, CMappingColIdVar *colid_var)
{
	CDXLTranslateContext *output_context =
		(dynamic_cast<CMappingColIdVarPlStmt *>(colid_var))->GetOutputContext();

	CContextDXLToPlStmt *dxl_to_plstmt_ctxt =
		(dynamic_cast<CMappingColIdVarPlStmt *>(colid_var))
			->GetDXLToPlStmtContext();

	CDXLScalarSubPlan *dxlop =
		CDXLScalarSubPlan::Cast(scalar_subplan_node->GetOperator());

	// translate subplan test expression
	List *param_ids = NIL;

	SubLinkType slink = CTranslatorUtils::MapDXLSubplanToSublinkType(
		dxlop->GetDxlSubplanType());
	Expr *test_expr = TranslateDXLSubplanTestExprToScalar(
		dxlop->GetDxlTestExpr(), slink, colid_var, dxlop->FOuterParam(),
		&param_ids);

	const CDXLColRefArray *outer_refs = dxlop->GetDxlOuterColRefsArray();

	const ULONG len = outer_refs->Size();

	// Translate a copy of the translate context: the param mappings from the outer scope get copied in the constructor
	CDXLTranslateContext subplan_translate_ctxt(
		m_mp, output_context->IsParentAggNode(),
		output_context->GetColIdToParamIdMap());

	// insert new outer ref mappings in the subplan translate context
	for (ULONG ul = 0; ul < len; ul++)
	{
		CDXLColRef *dxl_colref = (*outer_refs)[ul];
		IMDId *mdid = dxl_colref->MdidType();
		ULONG colid = dxl_colref->Id();
		INT type_modifier = dxl_colref->TypeModifier();
		OID type_oid = CMDIdGPDB::CastMdid(mdid)->Oid();

		if (nullptr == subplan_translate_ctxt.GetParamIdMappingElement(colid))
		{
			// keep outer reference mapping to the original column for subsequent subplans
			ULONG param_id = dxl_to_plstmt_ctxt->GetNextParamId(type_oid);
			CMappingElementColIdParamId *colid_to_param_id_map =
				GPOS_NEW(m_mp) CMappingElementColIdParamId(colid, param_id,
														   mdid, type_modifier);

			BOOL is_inserted GPOS_ASSERTS_ONLY =
				subplan_translate_ctxt.FInsertParamMapping(
					colid, colid_to_param_id_map);
			GPOS_ASSERT(is_inserted);
		}
	}

	CDXLNode *child_dxl = (*scalar_subplan_node)[0];
	GPOS_ASSERT(EdxloptypePhysical ==
				child_dxl->GetOperator()->GetDXLOperatorType());

	GPOS_ASSERT(nullptr != scalar_subplan_node);
	GPOS_ASSERT(EdxlopScalarSubPlan ==
				scalar_subplan_node->GetOperator()->GetDXLOperator());
	GPOS_ASSERT(1 == scalar_subplan_node->Arity());

	// generate the child plan,
	// Translate DXL->PlStmt translator to handle subplan's relational children
	CTranslatorDXLToPlStmt dxl_to_plstmt_translator(
		m_mp, m_md_accessor,
		(dynamic_cast<CMappingColIdVarPlStmt *>(colid_var))
			->GetDXLToPlStmtContext(),
		m_num_of_segments);
	CDXLTranslationContextArray *prev_siblings_ctxt_arr =
		GPOS_NEW(m_mp) CDXLTranslationContextArray(m_mp);
	Plan *plan_child = dxl_to_plstmt_translator.TranslateDXLOperatorToPlan(
		child_dxl, &subplan_translate_ctxt, prev_siblings_ctxt_arr);
	prev_siblings_ctxt_arr->Release();

	GPOS_ASSERT(nullptr != plan_child->targetlist &&
				1 <= gpdb::ListLength(plan_child->targetlist));

	// translate subplan and set test expression
	SubPlan *subplan =
		TranslateSubplanFromChildPlan(plan_child, slink, dxl_to_plstmt_ctxt);
	subplan->testexpr = (Node *) test_expr;
	subplan->paramIds = param_ids;

	// translate other subplan params
	TranslateSubplanParams(subplan, &subplan_translate_ctxt, outer_refs,
						   colid_var);

	return (Expr *) subplan;
}

//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateDXLTestExprScalarIdentToExpr
//
//      @doc:
//              Translate subplan test expression parameter
//
//---------------------------------------------------------------------------
void
CTranslatorDXLToScalar::TranslateDXLTestExprScalarIdentToExpr(
	CDXLNode *child_node, Param *param, CDXLScalarIdent **ident, Expr **expr)
{
	if (EdxlopScalarIdent == child_node->GetOperator()->GetDXLOperator())
	{
		// Ident
		*ident = CDXLScalarIdent::Cast(child_node->GetOperator());
		*expr = (Expr *) param;
	}
	else if (EdxlopScalarCast == child_node->GetOperator()->GetDXLOperator() &&
			 child_node->Arity() > 0 &&
			 EdxlopScalarIdent ==
				 (*child_node)[0]->GetOperator()->GetDXLOperator())
	{
		// Casted Ident
		*ident = CDXLScalarIdent::Cast((*child_node)[0]->GetOperator());
		CDXLScalarCast *scalar_cast =
			CDXLScalarCast::Cast(child_node->GetOperator());
		*expr =
			TranslateDXLScalarCastWithChildExpr(scalar_cast, (Expr *) param);
	}
	else if (EdxlopScalarCoerceViaIO ==
				 child_node->GetOperator()->GetDXLOperator() &&
			 child_node->Arity() > 0 &&
			 EdxlopScalarIdent ==
				 (*child_node)[0]->GetOperator()->GetDXLOperator())
	{
		// CoerceViaIO over Ident
		*ident = CDXLScalarIdent::Cast((*child_node)[0]->GetOperator());
		CDXLScalarCoerceViaIO *coerce =
			CDXLScalarCoerceViaIO::Cast(child_node->GetOperator());
		*expr =
			TranslateDXLScalarCoerceViaIOWithChildExpr(coerce, (Expr *) param);
	}
	else
	{
		// ORCA currently only supports PARAMs of the form id or cast(id)
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXL2PlStmtConversion,
				   GPOS_WSZ_LIT("Unsupported subplan test expression"));
	}
}


//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateDXLSubplanTestExprToScalar
//
//      @doc:
//              Translate subplan test expression
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLSubplanTestExprToScalar(
	CDXLNode *test_expr_node, SubLinkType slink, CMappingColIdVar *colid_var,
	BOOL has_outer_refs, List **param_ids)
{
	if (EXPR_SUBLINK == slink || EXISTS_SUBLINK == slink ||
		NOT_EXISTS_SUBLINK == slink)
	{
		// expr/exists/not-exists sublinks have no test expression
		return nullptr;
	}
	GPOS_ASSERT(nullptr != test_expr_node);

	if (HasConstTrue(test_expr_node, m_md_accessor))
	{
		// dummy test expression
		return (Expr *) TranslateDXLScalarConstToScalar(test_expr_node,
														nullptr);
	}

	if (EdxlopScalarCmp != test_expr_node->GetOperator()->GetDXLOperator())
	{
		// test expression is expected to be a comparison
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXL2PlStmtConversion,
				   GPOS_WSZ_LIT("Unexpected subplan test expression"));
	}

	GPOS_ASSERT(2 == test_expr_node->Arity());
	GPOS_ASSERT(ANY_SUBLINK == slink || ALL_SUBLINK == slink);

	// Translate arguments
	List *args = nullptr;

	CDXLNode *outer_child_node = (*test_expr_node)[0];
	CDXLNode *inner_child_node = (*test_expr_node)[1];

	CContextDXLToPlStmt *dxl_to_plstmt_ctxt =
		(dynamic_cast<CMappingColIdVarPlStmt *>(colid_var))
			->GetDXLToPlStmtContext();

	// translate outer expression (can be a deep scalar tree)
	Expr *outer_arg_expr = nullptr;
	if (has_outer_refs)
	{
		Param *param1 = MakeNode(Param);
		param1->paramkind = PARAM_EXEC;

		CDXLScalarIdent *outer_ident = nullptr;
		Expr *outer_expr = nullptr;

		TranslateDXLTestExprScalarIdentToExpr(outer_child_node, param1,
											  &outer_ident, &outer_expr);
		GPOS_ASSERT(nullptr != outer_ident);
		GPOS_ASSERT(nullptr != outer_expr);

		// finalize outer expression
		param1->paramtype = CMDIdGPDB::CastMdid(outer_ident->MdidType())->Oid();
		param1->paramtypmod = outer_ident->TypeModifier();
		param1->paramid = dxl_to_plstmt_ctxt->GetNextParamId(param1->paramtype);

		// test expression is used for non-scalar subplan,
		// first arg of test expression must be an EXEC param1 referring to subplan output
		args = gpdb::LAppend(args, outer_expr);

		// also, add this param1 to subplan param1 ids before translating other params
		*param_ids = gpdb::LAppendInt(*param_ids, param1->paramid);
	}
	else
	{
		outer_arg_expr = TranslateDXLToScalar(outer_child_node, colid_var);
		args = gpdb::LAppend(args, outer_arg_expr);
	}

	// translate inner expression (only certain forms supported)
	// second arg must be an EXEC param which is replaced during query execution with subplan output
	Param *param = MakeNode(Param);
	param->paramkind = PARAM_EXEC;

	CDXLScalarIdent *inner_ident = nullptr;
	Expr *inner_expr = nullptr;

	TranslateDXLTestExprScalarIdentToExpr(inner_child_node, param, &inner_ident,
										  &inner_expr);

	GPOS_ASSERT(nullptr != inner_ident);
	GPOS_ASSERT(nullptr != inner_expr);

	// finalize inner expression
	param->paramtype = CMDIdGPDB::CastMdid(inner_ident->MdidType())->Oid();
	param->paramtypmod = inner_ident->TypeModifier();
	param->paramid = dxl_to_plstmt_ctxt->GetNextParamId(param->paramtype);

	// test expression is used for non-scalar subplan,
	// second arg of test expression must be an EXEC param referring to subplan output
	args = gpdb::LAppend(args, inner_expr);

	// also, add this param to subplan param ids before translating other params
	*param_ids = gpdb::LAppendInt(*param_ids, param->paramid);

	// finally, create an OpExpr for subplan test expression
	CDXLScalarComp *scalar_cmp_dxl =
		CDXLScalarComp::Cast(test_expr_node->GetOperator());
	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(scalar_cmp_dxl->MDId());

	OpExpr *op_expr = MakeNode(OpExpr);
	op_expr->opno = CMDIdGPDB::CastMdid(scalar_cmp_dxl->MDId())->Oid();
	op_expr->opfuncid = CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();
	op_expr->opresulttype =
		CMDIdGPDB::CastMdid(m_md_accessor->PtMDType<IMDTypeBool>()->MDId())
			->Oid();
	op_expr->opcollid = gpdb::TypeCollation(op_expr->opresulttype);
	op_expr->opretset = false;
	op_expr->args = args;
	op_expr->inputcollid = gpdb::ExprCollation((Node *) op_expr->args);
	return (Expr *) op_expr;
}


//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateSubplanParams
//
//      @doc:
//              Translate subplan parameters
//
//---------------------------------------------------------------------------
void
CTranslatorDXLToScalar::TranslateSubplanParams(
	SubPlan *subplan, CDXLTranslateContext *dxl_translator_ctxt,
	const CDXLColRefArray *outer_refs, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != subplan);
	GPOS_ASSERT(nullptr != dxl_translator_ctxt);
	GPOS_ASSERT(nullptr != outer_refs);
	GPOS_ASSERT(nullptr != colid_var);

	// Create the PARAM and ARG nodes
	const ULONG size = outer_refs->Size();
	for (ULONG ul = 0; ul < size; ul++)
	{
		CDXLColRef *dxl_colref = (*outer_refs)[ul];
		dxl_colref->AddRef();
		const CMappingElementColIdParamId *colid_to_param_id_map =
			dxl_translator_ctxt->GetParamIdMappingElement(dxl_colref->Id());

		// TODO: eliminate param, it's not *really* used, and it's (short-term) leaked
		Param *param = TranslateParamFromMapping(colid_to_param_id_map);
		subplan->parParam = gpdb::LAppendInt(subplan->parParam, param->paramid);

		GPOS_ASSERT(
			colid_to_param_id_map->MdidType()->Equals(dxl_colref->MdidType()));

		CDXLScalarIdent *scalar_ident_dxl =
			GPOS_NEW(m_mp) CDXLScalarIdent(m_mp, dxl_colref);
		Expr *arg = (Expr *) colid_var->VarFromDXLNodeScId(scalar_ident_dxl);

		// not found in mapping, it must be an external parameter
		if (nullptr == arg)
		{
			arg = (Expr *) TranslateParamFromMapping(colid_to_param_id_map);
			GPOS_ASSERT(nullptr != arg);
		}

		scalar_ident_dxl->Release();
		subplan->args = gpdb::LAppend(subplan->args, arg);
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateSubplanFromChildPlan
//
//	@doc:
//		add child plan to translation context, and build a subplan from it
//
//---------------------------------------------------------------------------
SubPlan *
CTranslatorDXLToScalar::TranslateSubplanFromChildPlan(
	Plan *plan, SubLinkType slink, CContextDXLToPlStmt *dxl_to_plstmt_ctxt)
{
	dxl_to_plstmt_ctxt->AddSubplan(plan);

	SubPlan *subplan = MakeNode(SubPlan);
	subplan->plan_id =
		gpdb::ListLength(dxl_to_plstmt_ctxt->GetSubplanEntriesList());
	subplan->plan_name = GetSubplanAlias(subplan->plan_id);
	subplan->is_initplan = false;
	subplan->firstColType = gpdb::ExprType(
		(Node *) ((TargetEntry *) gpdb::ListNth(plan->targetlist, 0))->expr);
	// GPDB_91_MERGE_FIXME: collation
	subplan->firstColCollation = gpdb::TypeCollation(subplan->firstColType);
	subplan->firstColTypmod = -1;
	subplan->subLinkType = slink;
	subplan->is_multirow = false;
	subplan->unknownEqFalse = false;

	return subplan;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::GetSubplanAlias
//
//	@doc:
//		build plan name, for explain purposes
//
//---------------------------------------------------------------------------
CHAR *
CTranslatorDXLToScalar::GetSubplanAlias(ULONG plan_id)
{
	CWStringDynamic *plan_name = GPOS_NEW(m_mp) CWStringDynamic(m_mp);
	plan_name->AppendFormat(GPOS_WSZ_LIT("SubPlan %d"), plan_id);
	const WCHAR *buf = plan_name->GetBuffer();

	ULONG max_length = (GPOS_WSZ_LENGTH(buf) + 1) * GPOS_SIZEOF(WCHAR);
	CHAR *result_plan_name = (CHAR *) gpdb::GPDBAlloc(max_length);
	gpos::clib::Wcstombs(result_plan_name, const_cast<WCHAR *>(buf),
						 max_length);
	result_plan_name[max_length - 1] = '\0';
	GPOS_DELETE(plan_name);

	return result_plan_name;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateParamFromMapping
//
//	@doc:
//		Translates a GPDB param from the given mapping
//
//---------------------------------------------------------------------------
Param *
CTranslatorDXLToScalar::TranslateParamFromMapping(
	const CMappingElementColIdParamId *colid_to_param_id_map)
{
	Param *param = MakeNode(Param);
	param->paramid = colid_to_param_id_map->ParamId();
	param->paramkind = PARAM_EXEC;
	param->paramtype =
		CMDIdGPDB::CastMdid(colid_to_param_id_map->MdidType())->Oid();
	param->paramtypmod = colid_to_param_id_map->TypeModifier();
	// GPDB_91_MERGE_FIXME: collation
	param->paramcollid = gpdb::TypeCollation(param->paramtype);

	return param;
}


//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarBoolExprToScalar
//
//	@doc:
//		Translates a DXL scalar BoolExpr into a GPDB OpExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarBoolExprToScalar(
	const CDXLNode *scalar_bool_expr_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_bool_expr_node);
	CDXLScalarBoolExpr *dxlop =
		CDXLScalarBoolExpr::Cast(scalar_bool_expr_node->GetOperator());
	BoolExpr *scalar_bool_expr = MakeNode(BoolExpr);

	GPOS_ASSERT(1 <= scalar_bool_expr_node->Arity());
	switch (dxlop->GetDxlBoolTypeStr())
	{
		case Edxlnot:
		{
			GPOS_ASSERT(1 == scalar_bool_expr_node->Arity());
			scalar_bool_expr->boolop = NOT_EXPR;
			break;
		}
		case Edxland:
		{
			GPOS_ASSERT(2 <= scalar_bool_expr_node->Arity());
			scalar_bool_expr->boolop = AND_EXPR;
			break;
		}
		case Edxlor:
		{
			GPOS_ASSERT(2 <= scalar_bool_expr_node->Arity());
			scalar_bool_expr->boolop = OR_EXPR;
			break;
		}
		default:
		{
			GPOS_ASSERT(!"Boolean Operation: Must be either or/ and / not");
			return nullptr;
		}
	}

	scalar_bool_expr->args = TranslateScalarChildren(
		scalar_bool_expr->args, scalar_bool_expr_node, colid_var);
	scalar_bool_expr->location = -1;

	return (Expr *) scalar_bool_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarBooleanTestToScalar
//
//	@doc:
//		Translates a DXL scalar BooleanTest into a GPDB OpExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarBooleanTestToScalar(
	const CDXLNode *scalar_boolean_test_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_boolean_test_node);
	CDXLScalarBooleanTest *dxlop =
		CDXLScalarBooleanTest::Cast(scalar_boolean_test_node->GetOperator());
	BooleanTest *scalar_boolean_test = MakeNode(BooleanTest);

	switch (dxlop->GetDxlBoolTypeStr())
	{
		case EdxlbooleantestIsTrue:
			scalar_boolean_test->booltesttype = IS_TRUE;
			break;
		case EdxlbooleantestIsNotTrue:
			scalar_boolean_test->booltesttype = IS_NOT_TRUE;
			break;
		case EdxlbooleantestIsFalse:
			scalar_boolean_test->booltesttype = IS_FALSE;
			break;
		case EdxlbooleantestIsNotFalse:
			scalar_boolean_test->booltesttype = IS_NOT_FALSE;
			break;
		case EdxlbooleantestIsUnknown:
			scalar_boolean_test->booltesttype = IS_UNKNOWN;
			break;
		case EdxlbooleantestIsNotUnknown:
			scalar_boolean_test->booltesttype = IS_NOT_UNKNOWN;
			break;
		default:
		{
			GPOS_ASSERT(!"Invalid Boolean Test Operation");
			return nullptr;
		}
	}

	GPOS_ASSERT(1 == scalar_boolean_test_node->Arity());
	CDXLNode *dxlnode_arg = (*scalar_boolean_test_node)[0];

	Expr *arg_expr = TranslateDXLToScalar(dxlnode_arg, colid_var);
	scalar_boolean_test->arg = arg_expr;

	return (Expr *) scalar_boolean_test;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarNullTestToScalar
//
//	@doc:
//		Translates a DXL scalar NullTest into a GPDB NullTest node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarNullTestToScalar(
	const CDXLNode *scalar_null_test_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_null_test_node);
	CDXLScalarNullTest *dxlop =
		CDXLScalarNullTest::Cast(scalar_null_test_node->GetOperator());
	NullTest *null_test = MakeNode(NullTest);

	GPOS_ASSERT(1 == scalar_null_test_node->Arity());
	CDXLNode *child_dxl = (*scalar_null_test_node)[0];
	Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);

	if (dxlop->IsNullTest())
	{
		null_test->nulltesttype = IS_NULL;
	}
	else
	{
		null_test->nulltesttype = IS_NOT_NULL;
	}

	null_test->arg = child_expr;
	return (Expr *) null_test;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarNullIfToScalar
//
//	@doc:
//		Translates a DXL scalar nullif into a GPDB NullIfExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarNullIfToScalar(
	const CDXLNode *scalar_null_if_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_null_if_node);
	CDXLScalarNullIf *dxlop =
		CDXLScalarNullIf::Cast(scalar_null_if_node->GetOperator());

	NullIfExpr *scalar_null_if_expr = MakeNode(NullIfExpr);
	scalar_null_if_expr->opno = CMDIdGPDB::CastMdid(dxlop->MdIdOp())->Oid();

	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(dxlop->MdIdOp());

	scalar_null_if_expr->opfuncid =
		CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();
	scalar_null_if_expr->opresulttype =
		CMDIdGPDB::CastMdid(dxlop->MdidType())->Oid();
	scalar_null_if_expr->opretset = false;

	// translate children
	GPOS_ASSERT(2 == scalar_null_if_node->Arity());
	scalar_null_if_expr->args = TranslateScalarChildren(
		scalar_null_if_expr->args, scalar_null_if_node, colid_var);
	// GPDB_91_MERGE_FIXME: collation
	scalar_null_if_expr->opcollid =
		gpdb::TypeCollation(scalar_null_if_expr->opresulttype);
	scalar_null_if_expr->inputcollid =
		gpdb::ExprCollation((Node *) scalar_null_if_expr->args);

	return (Expr *) scalar_null_if_expr;
}

Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCastWithChildExpr(
	const CDXLScalarCast *scalar_cast, Expr *child_expr)
{
	if (IMDId::IsValid(scalar_cast->FuncMdId()))
	{
		FuncExpr *func_expr = MakeNode(FuncExpr);
		func_expr->funcid = CMDIdGPDB::CastMdid(scalar_cast->FuncMdId())->Oid();

		const IMDFunction *pmdfunc =
			m_md_accessor->RetrieveFunc(scalar_cast->FuncMdId());
		func_expr->funcretset = pmdfunc->ReturnsSet();
		;

		func_expr->funcformat = COERCE_IMPLICIT_CAST;
		func_expr->funcresulttype =
			CMDIdGPDB::CastMdid(scalar_cast->MdidType())->Oid();

		func_expr->args = NIL;
		func_expr->args = gpdb::LAppend(func_expr->args, child_expr);

		// GPDB_91_MERGE_FIXME: collation
		func_expr->inputcollid = gpdb::ExprCollation((Node *) func_expr->args);
		func_expr->funccollid = gpdb::TypeCollation(func_expr->funcresulttype);

		return (Expr *) func_expr;
	}

	RelabelType *relabel_type = MakeNode(RelabelType);

	relabel_type->resulttype =
		CMDIdGPDB::CastMdid(scalar_cast->MdidType())->Oid();
	relabel_type->arg = child_expr;
	relabel_type->resulttypmod = -1;
	relabel_type->location = -1;
	relabel_type->relabelformat = COERCE_IMPLICIT_CAST;
	// GPDB_91_MERGE_FIXME: collation
	relabel_type->resultcollid = gpdb::ExprCollation((Node *) child_expr);

	return (Expr *) relabel_type;
}

// Translates a DXL scalar cast into a GPDB RelabelType / FuncExpr node
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCastToScalar(
	const CDXLNode *scalar_cast_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_cast_node);
	const CDXLScalarCast *dxlop =
		CDXLScalarCast::Cast(scalar_cast_node->GetOperator());

	GPOS_ASSERT(1 == scalar_cast_node->Arity());
	CDXLNode *child_dxl = (*scalar_cast_node)[0];

	Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);

	return TranslateDXLScalarCastWithChildExpr(dxlop, child_expr);
}


//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateDXLScalarCoerceToDomainToScalar
//
//      @doc:
//              Translates a DXL scalar coerce into a GPDB coercetodomain node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCoerceToDomainToScalar(
	const CDXLNode *scalar_coerce_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_coerce_node);
	CDXLScalarCoerceToDomain *dxlop =
		CDXLScalarCoerceToDomain::Cast(scalar_coerce_node->GetOperator());

	GPOS_ASSERT(1 == scalar_coerce_node->Arity());
	CDXLNode *child_dxl = (*scalar_coerce_node)[0];
	Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);

	CoerceToDomain *coerce = MakeNode(CoerceToDomain);

	coerce->resulttype = CMDIdGPDB::CastMdid(dxlop->GetResultTypeMdId())->Oid();
	coerce->arg = child_expr;
	coerce->resulttypmod = dxlop->TypeModifier();
	coerce->location = dxlop->GetLocation();
	coerce->coercionformat = (CoercionForm) dxlop->GetDXLCoercionForm();
	// GPDB_91_MERGE_FIXME: collation
	coerce->resultcollid = gpdb::TypeCollation(coerce->resulttype);

	return (Expr *) coerce;
}

Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCoerceViaIOWithChildExpr(
	const CDXLScalarCoerceViaIO *dxl_coerce_via_io, Expr *child_expr)
{
	CoerceViaIO *coerce = MakeNode(CoerceViaIO);

	coerce->resulttype =
		CMDIdGPDB::CastMdid(dxl_coerce_via_io->GetResultTypeMdId())->Oid();
	coerce->arg = child_expr;
	coerce->location = dxl_coerce_via_io->GetLocation();
	coerce->coerceformat =
		(CoercionForm) dxl_coerce_via_io->GetDXLCoercionForm();
	// GPDB_91_MERGE_FIXME: collation
	coerce->resultcollid = gpdb::TypeCollation(coerce->resulttype);

	return (Expr *) coerce;
}

//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateDXLScalarCoerceViaIOToScalar
//
//      @doc:
//              Translates a DXL scalar coerce into a GPDB coerceviaio node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCoerceViaIOToScalar(
	const CDXLNode *scalar_coerce_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_coerce_node);
	CDXLScalarCoerceViaIO *dxlop =
		CDXLScalarCoerceViaIO::Cast(scalar_coerce_node->GetOperator());

	GPOS_ASSERT(1 == scalar_coerce_node->Arity());
	CDXLNode *child_dxl = (*scalar_coerce_node)[0];
	Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);

	return (Expr *) TranslateDXLScalarCoerceViaIOWithChildExpr(dxlop,
															   child_expr);
}

//---------------------------------------------------------------------------
//      @function:
//              CTranslatorDXLToScalar::TranslateDXLScalarArrayCoerceExprToScalar
//
//      @doc:
//              Translates a DXL scalar array coerce expr into a GPDB T_ArrayCoerceExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarArrayCoerceExprToScalar(
	const CDXLNode *scalar_coerce_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_coerce_node);
	CDXLScalarArrayCoerceExpr *dxlop =
		CDXLScalarArrayCoerceExpr::Cast(scalar_coerce_node->GetOperator());

	GPOS_ASSERT(1 == scalar_coerce_node->Arity());
	CDXLNode *child_dxl = (*scalar_coerce_node)[0];

	Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);

	ArrayCoerceExpr *coerce = MakeNode(ArrayCoerceExpr);

	coerce->arg = child_expr;
	Oid elemfuncid = CMDIdGPDB::CastMdid(dxlop->GetCoerceFuncMDid())->Oid();
	coerce->resulttype = CMDIdGPDB::CastMdid(dxlop->GetResultTypeMdId())->Oid();
	coerce->resulttypmod = dxlop->TypeModifier();
	// GPDB_91_MERGE_FIXME: collation
	coerce->resultcollid = gpdb::TypeCollation(coerce->resulttype);
	coerce->coerceformat = (CoercionForm) dxlop->GetDXLCoercionForm();
	coerce->location = dxlop->GetLocation();
	// GPDB_12_MERGE_FIXME: change the representation of
	// CDXLScalarArrayCoerceExpr so that we can correctly roundtrip
	CaseTestExpr *case_test_expr = MakeNode(CaseTestExpr);
	Oid input_array_type = gpdb::ExprType((Node *) child_expr);
	int32 input_array_elem_typmod = gpdb::ExprTypeMod((Node *) child_expr);
	case_test_expr->typeId = gpdb::GetElementType(input_array_type);
	case_test_expr->typeMod = input_array_elem_typmod;
	if (elemfuncid != 0)
	{
		FuncExpr *func_expr = MakeNode(FuncExpr);
		func_expr->funcid = elemfuncid;
		func_expr->funcformat = COERCE_EXPLICIT_CAST;
		// GPDB_12_MERGE_FIXME: shouldn't this come from the DXL as well?
		func_expr->funcresulttype = gpdb::GetFuncRetType(elemfuncid);
		// FIXME: this is a giant hack. We really should know the arity of the
		//   function we're calling. Instead, we're jamming three arguments,
		//   _always_
		func_expr->args = gpdb::LPrepend(
			case_test_expr, ListMake2(gpdb::MakeIntConst(dxlop->TypeModifier()),
									  gpdb::MakeBoolConst(true, false)));
		coerce->elemexpr = (Expr *) func_expr;
	}
	else
	{
		RelabelType *rt = MakeNode(RelabelType);
		rt->resulttypmod = dxlop->TypeModifier();
		rt->resulttype = gpdb::GetElementType(coerce->resulttype);
		rt->arg = (Expr *) case_test_expr;
		coerce->elemexpr = (Expr *) rt;
	}

	return (Expr *) coerce;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarCoalesceToScalar
//
//	@doc:
//		Translates a DXL scalar coalesce operator into a GPDB coalesce node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCoalesceToScalar(
	const CDXLNode *scalar_coalesce_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_coalesce_node);
	CDXLScalarCoalesce *dxlop =
		CDXLScalarCoalesce::Cast(scalar_coalesce_node->GetOperator());
	CoalesceExpr *coalesce = MakeNode(CoalesceExpr);

	coalesce->coalescetype = CMDIdGPDB::CastMdid(dxlop->MdidType())->Oid();
	// GPDB_91_MERGE_FIXME: collation
	coalesce->coalescecollid = gpdb::TypeCollation(coalesce->coalescetype);
	coalesce->args = TranslateScalarChildren(coalesce->args,
											 scalar_coalesce_node, colid_var);
	coalesce->location = -1;

	return (Expr *) coalesce;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarMinMaxToScalar
//
//	@doc:
//		Translates a DXL scalar minmax operator into a GPDB minmax node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarMinMaxToScalar(
	const CDXLNode *scalar_min_max_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_min_max_node);
	CDXLScalarMinMax *dxlop =
		CDXLScalarMinMax::Cast(scalar_min_max_node->GetOperator());
	MinMaxExpr *min_max_expr = MakeNode(MinMaxExpr);

	min_max_expr->minmaxtype = CMDIdGPDB::CastMdid(dxlop->MdidType())->Oid();
	min_max_expr->minmaxcollid = gpdb::TypeCollation(min_max_expr->minmaxtype);
	min_max_expr->args = TranslateScalarChildren(
		min_max_expr->args, scalar_min_max_node, colid_var);
	// GPDB_91_MERGE_FIXME: collation
	min_max_expr->inputcollid =
		gpdb::ExprCollation((Node *) min_max_expr->args);
	min_max_expr->location = -1;

	CDXLScalarMinMax::EdxlMinMaxType min_max_type = dxlop->GetMinMaxType();
	if (CDXLScalarMinMax::EmmtMax == min_max_type)
	{
		min_max_expr->op = IS_GREATEST;
	}
	else
	{
		GPOS_ASSERT(CDXLScalarMinMax::EmmtMin == min_max_type);
		min_max_expr->op = IS_LEAST;
	}

	return (Expr *) min_max_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateScalarChildren
//
//	@doc:
//		Translate children of DXL node, and add them to list
//
//---------------------------------------------------------------------------
List *
CTranslatorDXLToScalar::TranslateScalarChildren(List *list,
												const CDXLNode *dxlnode,
												CMappingColIdVar *colid_var)
{
	List *new_list = list;

	const ULONG arity = dxlnode->Arity();
	for (ULONG ul = 0; ul < arity; ul++)
	{
		CDXLNode *child_dxl = (*dxlnode)[ul];
		Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);
		new_list = gpdb::LAppend(new_list, child_expr);
	}

	return new_list;
}

List *
CTranslatorDXLToScalar::TranslateScalarListChildren(const CDXLNode *dxlnode,
													CMappingColIdVar *colid_var)
{
	List *new_list = nullptr;

	const ULONG arity = dxlnode->Arity();
	for (ULONG ul = 0; ul < arity; ul++)
	{
		CDXLNode *child_dxl = (*dxlnode)[ul];
		Expr *child_expr = TranslateDXLToScalar(child_dxl, colid_var);
		new_list = gpdb::LAppend(new_list, child_expr);
	}

	return new_list;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarConstToScalar
//
//	@doc:
//		Translates a DXL scalar constant operator into a GPDB scalar const node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarConstToScalar(
	const CDXLNode *const_node,
	CMappingColIdVar *	//colid_var
)
{
	GPOS_ASSERT(nullptr != const_node);
	CDXLScalarConstValue *dxlop =
		CDXLScalarConstValue::Cast(const_node->GetOperator());
	CDXLDatum *datum_dxl = const_cast<CDXLDatum *>(dxlop->GetDatumVal());

	return TranslateDXLDatumToScalar(datum_dxl);
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLDatumToScalar
//
//	@doc:
//		Translates a DXL datum into a GPDB scalar const node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLDatumToScalar(CDXLDatum *datum_dxl)
{
	GPOS_ASSERT(nullptr != datum_dxl);

	CDXLDatum::EdxldatumType edxldatumtype = datum_dxl->GetDatumType();
	switch (edxldatumtype)
	{
		default:
		{
			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXL2PlStmtConversion,
					   CDXLTokens::GetDXLTokenStr(EdxltokenScalarConstValue)
						   ->GetBuffer());
		}
		case CDXLDatum::EdxldatumInt2:
		{
			return (Expr *) ConvertDXLDatumToConstInt2(datum_dxl);
		}
		case CDXLDatum::EdxldatumInt4:
		{
			return (Expr *) ConvertDXLDatumToConstInt4(datum_dxl);
		}
		case CDXLDatum::EdxldatumInt8:
		{
			return (Expr *) ConvertDXLDatumToConstInt8(datum_dxl);
		}
		case CDXLDatum::EdxldatumBool:
		{
			return (Expr *) ConvertDXLDatumToConstBool(datum_dxl);
		}
		case CDXLDatum::EdxldatumOid:
		{
			return (Expr *) ConvertDXLDatumToConstOid(datum_dxl);
		}
		case CDXLDatum::EdxldatumGeneric:
		case CDXLDatum::EdxldatumStatsDoubleMappable:
		case CDXLDatum::EdxldatumStatsLintMappable:
		{
			return (Expr *) TranslateDXLDatumGenericToScalar(datum_dxl);
		}
	}
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::ConvertDXLDatumToConstOid
//
//	@doc:
//		Translates an oid datum into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::ConvertDXLDatumToConstOid(CDXLDatum *datum_dxl)
{
	CDXLDatumOid *oid_datum_dxl = CDXLDatumOid::Cast(datum_dxl);

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(oid_datum_dxl->MDId())->Oid();
	constant->consttypmod = -1;
	constant->constcollid = InvalidOid;
	constant->constbyval = true;
	constant->constisnull = oid_datum_dxl->IsNull();
	constant->constlen = sizeof(Oid);

	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else
	{
		constant->constvalue = gpdb::DatumFromInt32(oid_datum_dxl->OidValue());
	}

	return constant;
}


//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::ConvertDXLDatumToConstInt2
//
//	@doc:
//		Translates an int2 datum into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::ConvertDXLDatumToConstInt2(CDXLDatum *datum_dxl)
{
	CDXLDatumInt2 *datum_int2_dxl = CDXLDatumInt2::Cast(datum_dxl);

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(datum_int2_dxl->MDId())->Oid();
	constant->consttypmod = -1;
	constant->constcollid = InvalidOid;
	constant->constbyval = true;
	constant->constisnull = datum_int2_dxl->IsNull();
	constant->constlen = sizeof(int16);

	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else
	{
		constant->constvalue = gpdb::DatumFromInt16(datum_int2_dxl->Value());
	}

	return constant;
}


//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::ConvertDXLDatumToConstInt4
//
//	@doc:
//		Translates an int4 datum into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::ConvertDXLDatumToConstInt4(CDXLDatum *datum_dxl)
{
	CDXLDatumInt4 *datum_int4_dxl = CDXLDatumInt4::Cast(datum_dxl);

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(datum_int4_dxl->MDId())->Oid();
	constant->consttypmod = -1;
	constant->constcollid = InvalidOid;
	constant->constbyval = true;
	constant->constisnull = datum_int4_dxl->IsNull();
	constant->constlen = sizeof(int32);

	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else
	{
		constant->constvalue = gpdb::DatumFromInt32(datum_int4_dxl->Value());
	}

	return constant;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::ConvertDXLDatumToConstInt8
//
//	@doc:
//		Translates an int8 datum into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::ConvertDXLDatumToConstInt8(CDXLDatum *datum_dxl)
{
	CDXLDatumInt8 *datum_int8_dxl = CDXLDatumInt8::Cast(datum_dxl);

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(datum_int8_dxl->MDId())->Oid();
	constant->consttypmod = -1;
	constant->constcollid = InvalidOid;
	constant->constbyval = FLOAT8PASSBYVAL;
	constant->constisnull = datum_int8_dxl->IsNull();
	constant->constlen = sizeof(int64);

	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else
	{
		constant->constvalue = gpdb::DatumFromInt64(datum_int8_dxl->Value());
	}

	return constant;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::ConvertDXLDatumToConstBool
//
//	@doc:
//		Translates a boolean datum into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::ConvertDXLDatumToConstBool(CDXLDatum *datum_dxl)
{
	CDXLDatumBool *datum_bool_dxl = CDXLDatumBool::Cast(datum_dxl);

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(datum_bool_dxl->MDId())->Oid();
	constant->consttypmod = -1;
	constant->constcollid = InvalidOid;
	constant->constbyval = true;
	constant->constisnull = datum_bool_dxl->IsNull();
	constant->constlen = sizeof(bool);

	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else
	{
		constant->constvalue = gpdb::DatumFromBool(datum_bool_dxl->GetValue());
	}


	return constant;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLDatumGenericToScalar
//
//	@doc:
//		Translates a datum of generic type into a constant
//
//---------------------------------------------------------------------------
Const *
CTranslatorDXLToScalar::TranslateDXLDatumGenericToScalar(CDXLDatum *datum_dxl)
{
	CDXLDatumGeneric *datum_generic_dxl = CDXLDatumGeneric::Cast(datum_dxl);
	const IMDType *type =
		m_md_accessor->RetrieveType(datum_generic_dxl->MDId());

	Const *constant = MakeNode(Const);
	constant->consttype = CMDIdGPDB::CastMdid(datum_generic_dxl->MDId())->Oid();
	constant->consttypmod = datum_generic_dxl->TypeModifier();
	// GPDB_91_MERGE_FIXME: collation
	constant->constcollid = gpdb::TypeCollation(constant->consttype);
	constant->constbyval = type->IsPassedByValue();
	constant->constlen = type->Length();

	constant->constisnull = datum_generic_dxl->IsNull();
	if (constant->constisnull)
	{
		constant->constvalue = (Datum) 0;
	}
	else if (constant->constbyval)
	{
		// if it is a by-value constant, the value is stored in the datum.
		GPOS_ASSERT(constant->constlen >= 0);
		GPOS_ASSERT((ULONG) constant->constlen <= sizeof(Datum));
		memcpy(&constant->constvalue, datum_generic_dxl->GetByteArray(),
			   sizeof(Datum));
	}
	else
	{
		Datum val = gpdb::DatumFromPointer(datum_generic_dxl->GetByteArray());
		ULONG length = (ULONG) gpdb::DatumSize(val, false, constant->constlen);

		CHAR *str = (CHAR *) gpdb::GPDBAlloc(length + 1);
		memcpy(str, datum_generic_dxl->GetByteArray(), length);
		str[length] = '\0';
		constant->constvalue = gpdb::DatumFromPointer(str);
	}

	return constant;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarIdentToScalar
//
//	@doc:
//		Translates a DXL scalar ident into a GPDB Expr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarIdentToScalar(
	const CDXLNode *scalar_id_node, CMappingColIdVar *colid_var)
{
	CMappingColIdVarPlStmt *colid_var_plstmt_map =
		dynamic_cast<CMappingColIdVarPlStmt *>(colid_var);

	// scalar identifier
	CDXLScalarIdent *dxlop =
		CDXLScalarIdent::Cast(scalar_id_node->GetOperator());
	Expr *result_expr = nullptr;
	if (nullptr == colid_var_plstmt_map ||
		nullptr ==
			colid_var_plstmt_map->GetOutputContext()->GetParamIdMappingElement(
				dxlop->GetDXLColRef()->Id()))
	{
		// not an outer ref -> Translate var node
		result_expr = (Expr *) colid_var->VarFromDXLNodeScId(dxlop);
	}
	else
	{
		// outer ref -> Translate param node
		result_expr =
			(Expr *) colid_var_plstmt_map->ParamFromDXLNodeScId(dxlop);
	}

	if (nullptr == result_expr)
	{
		GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXL2PlStmtAttributeNotFound,
				   dxlop->GetDXLColRef()->Id());
	}
	return result_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarCmpToScalar
//
//	@doc:
//		Translates a DXL scalar comparison operator or a scalar distinct comparison into a GPDB OpExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarCmpToScalar(
	const CDXLNode *scalar_cmp_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_cmp_node);
	CDXLScalarComp *dxlop =
		CDXLScalarComp::Cast(scalar_cmp_node->GetOperator());

	OpExpr *op_expr = MakeNode(OpExpr);
	op_expr->opno = CMDIdGPDB::CastMdid(dxlop->MDId())->Oid();

	const IMDScalarOp *md_scalar_op =
		m_md_accessor->RetrieveScOp(dxlop->MDId());

	op_expr->opfuncid = CMDIdGPDB::CastMdid(md_scalar_op->FuncMdId())->Oid();
	op_expr->opresulttype =
		CMDIdGPDB::CastMdid(m_md_accessor->PtMDType<IMDTypeBool>()->MDId())
			->Oid();
	op_expr->opretset = false;

	// translate left and right child
	GPOS_ASSERT(2 == scalar_cmp_node->Arity());

	CDXLNode *left_node = (*scalar_cmp_node)[EdxlsccmpIndexLeft];
	CDXLNode *right_node = (*scalar_cmp_node)[EdxlsccmpIndexRight];

	Expr *left_expr = TranslateDXLToScalar(left_node, colid_var);
	Expr *right_expr = TranslateDXLToScalar(right_node, colid_var);

	op_expr->args = ListMake2(left_expr, right_expr);

	// GPDB_91_MERGE_FIXME: collation
	op_expr->inputcollid = gpdb::ExprCollation((Node *) op_expr->args);
	op_expr->opcollid = gpdb::TypeCollation(op_expr->opresulttype);
	;

	return (Expr *) op_expr;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarArrayToScalar
//
//	@doc:
//		Translates a DXL scalar array into a GPDB ArrayExpr node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarArrayToScalar(
	const CDXLNode *scalar_array_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_array_node);
	CDXLScalarArray *dxlop =
		CDXLScalarArray::Cast(scalar_array_node->GetOperator());

	ArrayExpr *expr = MakeNode(ArrayExpr);
	expr->element_typeid = CMDIdGPDB::CastMdid(dxlop->ElementTypeMDid())->Oid();
	expr->array_typeid = CMDIdGPDB::CastMdid(dxlop->ArrayTypeMDid())->Oid();
	// GPDB_91_MERGE_FIXME: collation
	expr->array_collid = gpdb::TypeCollation(expr->array_typeid);
	expr->multidims = dxlop->IsMultiDimensional();
	expr->elements =
		TranslateScalarChildren(expr->elements, scalar_array_node, colid_var);

	/*
	 * ORCA doesn't know how to construct array constants, so it will
	 * return any arrays as ArrayExprs. Convert them to array constants,
	 * for more efficient evaluation at runtime. (This will try to further
	 * simplify the elements, too, but that is most likely futile, as the
	 * expressions were already simplified as much as we could before they
	 * were passed to ORCA. But there's little harm in trying).
	 */
	return (Expr *) gpdb::EvalConstExpressions((Node *) expr);
}

Expr *
CTranslatorDXLToScalar::TranslateDXLScalarValuesListToScalar(
	const CDXLNode *scalar_array_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_array_node);

	List *values = nullptr;
	values = TranslateScalarChildren(values, scalar_array_node, colid_var);

	return (Expr *) values;
}
//
// GPDB_12_MERGE_FIXME: ArrayRef was renamed in commit 558d77f20e4e9.
// I've fixed the renamed type and fields but the wording "ArrayRef" is
// still everywhere. Do we plan to rename them?

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarArrayRefToScalar
//
//	@doc:
//		Translates a DXL scalar arrayref into a GPDB SubscriptingRef node
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarArrayRefToScalar(
	const CDXLNode *scalar_array_ref_node, CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != scalar_array_ref_node);
	CDXLScalarArrayRef *dxlop =
		CDXLScalarArrayRef::Cast(scalar_array_ref_node->GetOperator());

	SubscriptingRef *array_ref = MakeNode(SubscriptingRef);
	array_ref->refcontainertype =
		CMDIdGPDB::CastMdid(dxlop->ArrayTypeMDid())->Oid();
	array_ref->refelemtype =
		CMDIdGPDB::CastMdid(dxlop->ElementTypeMDid())->Oid();
	// GPDB_91_MERGE_FIXME: collation
	array_ref->refcollid = gpdb::TypeCollation(array_ref->refelemtype);
	array_ref->reftypmod = dxlop->TypeModifier();

	const ULONG arity = scalar_array_ref_node->Arity();
	GPOS_ASSERT(3 == arity || 4 == arity);

	array_ref->reflowerindexpr = TranslateDXLArrayRefIndexListToScalar(
		(*scalar_array_ref_node)[0], CDXLScalarArrayRefIndexList::EilbLower,
		colid_var);
	array_ref->refupperindexpr = TranslateDXLArrayRefIndexListToScalar(
		(*scalar_array_ref_node)[1], CDXLScalarArrayRefIndexList::EilbUpper,
		colid_var);

	array_ref->refexpr =
		TranslateDXLToScalar((*scalar_array_ref_node)[2], colid_var);
	array_ref->refassgnexpr = nullptr;
	if (4 == arity)
	{
		array_ref->refassgnexpr =
			TranslateDXLToScalar((*scalar_array_ref_node)[3], colid_var);
	}

	return (Expr *) array_ref;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLArrayRefIndexListToScalar
//
//	@doc:
//		Translates a DXL arrayref index list
//
//---------------------------------------------------------------------------
List *
CTranslatorDXLToScalar::TranslateDXLArrayRefIndexListToScalar(
	const CDXLNode *index_list_node,
	CDXLScalarArrayRefIndexList::EIndexListBound
#ifdef GPOS_DEBUG
		index_list_bound
#endif	//GPOS_DEBUG
	,
	CMappingColIdVar *colid_var)
{
	GPOS_ASSERT(nullptr != index_list_node);
	GPOS_ASSERT(index_list_bound == CDXLScalarArrayRefIndexList::Cast(
										index_list_node->GetOperator())
										->GetDXLIndexListBound());

	List *children = NIL;
	children = TranslateScalarChildren(children, index_list_node, colid_var);

	return children;
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::TranslateDXLScalarDMLActionToScalar
//
//	@doc:
//		Translates a DML action expression
//
//---------------------------------------------------------------------------
Expr *
CTranslatorDXLToScalar::TranslateDXLScalarDMLActionToScalar(
	const CDXLNode *
#ifdef GPOS_DEBUG
		dml_action_node
#endif
	,
	CMappingColIdVar *	// colid_var
)
{
	GPOS_ASSERT(nullptr != dml_action_node);
	GPOS_ASSERT(EdxlopScalarDMLAction ==
				dml_action_node->GetOperator()->GetDXLOperator());

	DMLActionExpr *expr = MakeNode(DMLActionExpr);

	return (Expr *) expr;
}


Expr *
CTranslatorDXLToScalar::TranslateDXLScalarSortGroupClauseToScalar(
	const CDXLNode *node,
	CMappingColIdVar *	//colid_var
)
{
	CDXLScalarSortGroupClause *dxlop =
		CDXLScalarSortGroupClause::Cast(node->GetOperator());

	SortGroupClause *expr = MakeNode(SortGroupClause);
	expr->tleSortGroupRef = dxlop->Index();
	expr->eqop = dxlop->EqOp();
	expr->sortop = dxlop->SortOp();
	expr->nulls_first = dxlop->NullsFirst();
	expr->hashable = dxlop->IsHashable();

	return (Expr *) expr;
}


//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::GetFunctionReturnTypeOid
//
//	@doc:
//		Returns the operator return type oid for the operator funcid from the translation context
//
//---------------------------------------------------------------------------
Oid
CTranslatorDXLToScalar::GetFunctionReturnTypeOid(IMDId *mdid) const
{
	return CMDIdGPDB::CastMdid(
			   m_md_accessor->RetrieveFunc(mdid)->GetResultTypeMdid())
		->Oid();
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::HasBoolResult
//
//	@doc:
//		Check to see if the operator returns a boolean result
//
//---------------------------------------------------------------------------
BOOL
CTranslatorDXLToScalar::HasBoolResult(CDXLNode *dxlnode,
									  CMDAccessor *md_accessor)
{
	GPOS_ASSERT(nullptr != dxlnode);

	if (EdxloptypeScalar != dxlnode->GetOperator()->GetDXLOperatorType())
	{
		return false;
	}

	CDXLScalar *dxlop = dynamic_cast<CDXLScalar *>(dxlnode->GetOperator());

	return dxlop->HasBoolResult(md_accessor);
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::HasConstTrue
//
//	@doc:
//		Check if the operator is a "true" bool constant
//
//---------------------------------------------------------------------------
BOOL
CTranslatorDXLToScalar::HasConstTrue(CDXLNode *dxlnode,
									 CMDAccessor *md_accessor)
{
	GPOS_ASSERT(nullptr != dxlnode);
	if (!HasBoolResult(dxlnode, md_accessor) ||
		EdxlopScalarConstValue != dxlnode->GetOperator()->GetDXLOperator())
	{
		return false;
	}

	CDXLScalarConstValue *dxlop =
		CDXLScalarConstValue::Cast(dxlnode->GetOperator());
	CDXLDatumBool *datum_bool_dxl =
		CDXLDatumBool::Cast(const_cast<CDXLDatum *>(dxlop->GetDatumVal()));

	return datum_bool_dxl->GetValue();
}

//---------------------------------------------------------------------------
//	@function:
//		CTranslatorDXLToScalar::HasConstNull
//
//	@doc:
//		Check if the operator is a NULL constant
//
//---------------------------------------------------------------------------
BOOL
CTranslatorDXLToScalar::HasConstNull(CDXLNode *dxlnode)
{
	GPOS_ASSERT(nullptr != dxlnode);
	if (EdxlopScalarConstValue != dxlnode->GetOperator()->GetDXLOperator())
	{
		return false;
	}

	CDXLScalarConstValue *dxlop =
		CDXLScalarConstValue::Cast(dxlnode->GetOperator());

	return dxlop->GetDatumVal()->IsNull();
}

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CCTEListEntry 源码

greenplumn CContextDXLToPlStmt 源码

greenplumn CContextQueryToDXL 源码

greenplumn CDXLTranslateContext 源码

greenplumn CDXLTranslateContextBaseTable 源码

greenplumn CMappingColIdVar 源码

greenplumn CMappingColIdVarPlStmt 源码

greenplumn CMappingElementColIdParamId 源码

greenplumn CMappingVarColId 源码

greenplumn CPartPruneStepsBuilder 源码

0  赞