greenplumn CDXLScalarSubPlan 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarSubPlan.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLScalarSubPlan.h
/
/ @doc:
/ Class for representing DXL Scalar SubPlan operator
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarSubPlan_H
#define GPDXL_CDXLScalarSubPlan_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLColRef.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
using namespace gpos;
/ indices of SubPlan elements in the children array
enum EdxlSubPlan
{
EdxlSubPlanIndexChildPlan,
EdxlSubPlanIndexSentinel
};
/ subplan type
enum EdxlSubPlanType
{
EdxlSubPlanTypeScalar = 0, / subplan for scalar subquery
EdxlSubPlanTypeExists, / subplan for exists subquery
EdxlSubPlanTypeNotExists, / subplan for not exists subquery
EdxlSubPlanTypeAny, / subplan for quantified (ANY/IN) subquery
EdxlSubPlanTypeAll, / subplan for quantified (ALL/NOT IN) subquery
EdxlSubPlanTypeSentinel
};
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarSubPlan
/
/ @doc:
/ Class for representing DXL scalar SubPlan operator
/
/---------------------------------------------------------------------------
class CDXLScalarSubPlan : public CDXLScalar
{
private:
/ catalog MDId of the first column type
IMDId *m_first_col_type_mdid;
/ array of outer column references
CDXLColRefArray *m_dxl_colref_array;
/ subplan type
EdxlSubPlanType m_dxl_subplan_type;
/ test expression -- not null if quantified/existential subplan
CDXLNode *m_dxlnode_test_expr;
/ does test expression contain outer param
BOOL m_outer_param;
public:
CDXLScalarSubPlan(CDXLScalarSubPlan &) = delete;
/ ctor/dtor
CDXLScalarSubPlan(CMemoryPool *mp, IMDId *first_col_type_mdid,
CDXLColRefArray *dxl_colref_array,
EdxlSubPlanType dxl_subplan_type,
CDXLNode *dxlnode_test_expr, BOOL outer_param = false);
~CDXLScalarSubPlan() override;
/ Operator type
Edxlopid
GetDXLOperator() const override
{
return EdxlopScalarSubPlan;
}
/ Operator name
const CWStringConst *GetOpNameStr() const override;
/ type of first output column
IMDId *GetFirstColTypeMdId() const;
/ outer references
const CDXLColRefArray *
GetDxlOuterColRefsArray() const
{
return m_dxl_colref_array;
}
/ return subplan type
EdxlSubPlanType
GetDxlSubplanType() const
{
return m_dxl_subplan_type;
}
/ return test expression
CDXLNode *
GetDxlTestExpr() const
{
return m_dxlnode_test_expr;
}
BOOL
FOuterParam() const
{
return m_outer_param;
}
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
/ conversion function
static CDXLScalarSubPlan *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarSubPlan == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarSubPlan *>(dxl_op);
}
/ does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
/ return a string representation of Subplan type
const CWStringConst *GetSubplanTypeStr() const;
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarSubPlan_H
/EOF
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