greenplumn CTranslatorDXLToExprUtils 源码
greenplumn CTranslatorDXLToExprUtils 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/translate/CTranslatorDXLToExprUtils.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CTranslatorDXLToExprUtils.h
//
// @doc:
// Class providing helper methods for translating from DXL to Expr
//---------------------------------------------------------------------------
#ifndef GPOPT_CTranslatorDXLToExprUtils_H
#define GPOPT_CTranslatorDXLToExprUtils_H
#include "gpos/base.h"
#include "gpopt/mdcache/CMDAccessor.h"
#include "gpopt/metadata/CTableDescriptor.h"
#include "gpopt/operators/CExpression.h"
#include "gpopt/operators/CScalarBoolOp.h"
#include "gpopt/operators/CScalarConst.h"
#include "naucrates/dxl/operators/CDXLColDescr.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/operators/CDXLScalarBoolExpr.h"
namespace gpmd
{
class IMDRelation;
}
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
using namespace gpdxl;
//---------------------------------------------------------------------------
// @class:
// CTranslatorDXLToExprUtils
//
// @doc:
// Class providing helper methods for translating from DXL to Expr
//
//---------------------------------------------------------------------------
class CTranslatorDXLToExprUtils
{
public:
// create a cast expression from INT to INT8
static CExpression *PexprConstInt8(CMemoryPool *mp,
CMDAccessor *md_accessor,
CSystemId sysid, LINT liValue);
// create a scalar const operator from a DXL scalar const operator
static CScalarConst *PopConst(CMemoryPool *mp, CMDAccessor *md_accessor,
const CDXLScalarConstValue *dxl_op);
// create a datum from a DXL scalar const operator
static IDatum *GetDatum(CMDAccessor *md_accessor,
const CDXLScalarConstValue *dxl_op);
// create a datum array from a dxl datum array
static IDatumArray *Pdrgpdatum(CMemoryPool *mp, CMDAccessor *md_accessor,
const CDXLDatumArray *pdrgpdatum);
// update table descriptor's key sets info from the MD cache object
static void AddKeySets(CMemoryPool *mp, CTableDescriptor *ptabdesc,
const IMDRelation *pmdrel,
UlongToUlongMap *phmululColMapping);
// check if a dxl node is a boolean expression of the given type
static BOOL FScalarBool(const CDXLNode *dxlnode,
EdxlBoolExprType edxlboolexprtype);
// returns the equivalent bool expression type in the optimizer for
// a given DXL bool expression type
static CScalarBoolOp::EBoolOperator EBoolOperator(
EdxlBoolExprType edxlbooltype);
// construct a dynamic array of col refs corresponding to the given col ids
static CColRefArray *Pdrgpcr(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
const ULongPtrArray *colids);
// is the given expression is a scalar function that casts
static BOOL FCastFunc(CMDAccessor *md_accessor, const CDXLNode *dxlnode,
IMDId *pmdidInput);
};
} // namespace gpopt
#endif // !GPOPT_CTranslatorDXLToExprUtils_H
// EOF
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