greenplumn CXformGbAgg2Apply 源码
greenplumn CXformGbAgg2Apply 代码
文件路径：/src/backend/gporca/libgpopt/src/xforms/CXformGbAgg2Apply.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformGbAgg2Apply.cpp
//
// @doc:
// Implementation of GbAgg to Apply transform
//---------------------------------------------------------------------------
#include "gpopt/xforms/CXformGbAgg2Apply.h"
#include "gpos/base.h"
#include "gpopt/operators/CLogicalGbAgg.h"
#include "gpopt/operators/CPatternLeaf.h"
using namespace gpopt;
//---------------------------------------------------------------------------
// @function:
// CXformGbAgg2Apply::CXformGbAgg2Apply
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CXformGbAgg2Apply::CXformGbAgg2Apply(CMemoryPool *mp)
: // pattern
CXformSubqueryUnnest(GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CLogicalGbAgg(mp),
GPOS_NEW(mp) CExpression(
mp, GPOS_NEW(mp) CPatternLeaf(mp)), // relational child
GPOS_NEW(mp)
CExpression(mp, GPOS_NEW(mp) CPatternTree(mp)) // project list
))
{
}
//---------------------------------------------------------------------------
// @function:
// CXformGbAgg2Apply::Exfp
//
// @doc:
// Compute xform promise for a given expression handle;
// scalar child must have subquery
//
//---------------------------------------------------------------------------
CXform::EXformPromise
CXformGbAgg2Apply::Exfp(CExpressionHandle &exprhdl) const
{
CLogicalGbAgg *popGbAgg = CLogicalGbAgg::PopConvert(exprhdl.Pop());
if (popGbAgg->FGlobal() && exprhdl.DeriveHasSubquery(1))
{
return CXform::ExfpHigh;
}
return CXform::ExfpNone;
}
// EOF
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