greenplumn CXformJoin2IndexApplyGeneric 源码
greenplumn CXformJoin2IndexApplyGeneric 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformJoin2IndexApplyGeneric.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (c) 2020 VMware and affiliates, Inc.
//
// Transform a join into an index apply. Allow a variety of nodes on
// the innser side, including a mandatory get, plus optional select,
// project and aggregate nodes.
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformJoin2IndexApplyGeneric_H
#define GPOPT_CXformJoin2IndexApplyGeneric_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalJoin.h"
#include "gpopt/operators/CPatternLeaf.h"
#include "gpopt/operators/CPatternNode.h"
#include "gpopt/xforms/CXformJoin2IndexApply.h"
namespace gpopt
{
using namespace gpos;
class CXformJoin2IndexApplyGeneric : public CXformJoin2IndexApply
{
private:
// this decides which types of plans are produced, index gets or bitmap gets
BOOL m_generateBitmapPlans;
// Can we transform left outer join to left outer index apply?
static BOOL FCanLeftOuterIndexApply(CMemoryPool *mp,
CExpression *pexprInner,
CExpression *pexprScalar,
CTableDescriptor *ptabDesc,
const CColRefSet *pcrsDist);
public:
CXformJoin2IndexApplyGeneric(const CXformJoin2IndexApplyGeneric &) = delete;
// ctor
explicit CXformJoin2IndexApplyGeneric(CMemoryPool *mp,
BOOL generateBitmapPlans)
: // pattern
CXformJoin2IndexApply(GPOS_NEW(mp) CExpression(
mp,
GPOS_NEW(mp)
CPatternNode(mp, CPatternNode::EmtMatchInnerOrLeftOuterJoin),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // outer child
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternTree(mp)), // inner child
GPOS_NEW(mp) CExpression(mp, GPOS_NEW(mp) CPatternTree(
mp)) // predicate tree operator,
)),
m_generateBitmapPlans(generateBitmapPlans)
{
}
// dtor
~CXformJoin2IndexApplyGeneric() override = default;
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
// Return true if xform should be applied only once.
// For now return true. We may need to revisit this if we find that
// there are multiple bindings and we miss interesting bindings because
// we extract only one of them.
BOOL
IsApplyOnce() override
{
return true;
}
}; // class CXformJoin2IndexApplyGeneric
} // namespace gpopt
#endif // !GPOPT_CXformJoin2IndexApplyGeneric_H
// EOF
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