greenplumn CLogicalLeftSemiCorrelatedApply 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CLogicalLeftSemiCorrelatedApply.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CLogicalLeftSemiCorrelatedApply.h
/
/ @doc:
/ Logical Left Semi Correlated Apply operator;
/ a variant of left semi apply that captures the need to implement a
/ correlated-execution strategy for EXISTS subquery
/---------------------------------------------------------------------------
#ifndef GPOPT_CLogicalLeftSemiCorrelatedApply_H
#define GPOPT_CLogicalLeftSemiCorrelatedApply_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftSemiApply.h"
namespace gpopt
{
/---------------------------------------------------------------------------
/ @class:
/ CLogicalLeftSemiCorrelatedApply
/
/ @doc:
/ Logical Apply operator used in scalar subquery transformations
/
/---------------------------------------------------------------------------
class CLogicalLeftSemiCorrelatedApply : public CLogicalLeftSemiApply
{
private:
public:
CLogicalLeftSemiCorrelatedApply(const CLogicalLeftSemiCorrelatedApply &) =
delete;
/ ctor for patterns
explicit CLogicalLeftSemiCorrelatedApply(CMemoryPool *mp);
/ ctor
CLogicalLeftSemiCorrelatedApply(CMemoryPool *mp, CColRefArray *pdrgpcrInner,
EOperatorId eopidOriginSubq);
/ dtor
~CLogicalLeftSemiCorrelatedApply() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopLogicalLeftSemiCorrelatedApply;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CLogicalLeftSemiCorrelatedApply";
}
/ applicable transformations
CXformSet *PxfsCandidates(CMemoryPool *mp) const override;
/ return true if operator is a correlated apply
BOOL
FCorrelated() const override
{
return true;
}
/ return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
/ conversion function
static CLogicalLeftSemiCorrelatedApply *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopLogicalLeftSemiCorrelatedApply == pop->Eopid());
return dynamic_cast<CLogicalLeftSemiCorrelatedApply *>(pop);
}
}; / class CLogicalLeftSemiCorrelatedApply
} / namespace gpopt
#endif / !GPOPT_CLogicalLeftSemiCorrelatedApply_H
/ EOF
相关信息
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码