greenplumn CXformProject2ComputeScalar 源码
greenplumn CXformProject2ComputeScalar 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformProject2ComputeScalar.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformProject2ComputeScalar.h
//
// @doc:
// Transform Project to ComputeScalar
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformProject2ComputeScalar_H
#define GPOPT_CXformProject2ComputeScalar_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformProject2ComputeScalar
//
// @doc:
// Transform Project to ComputeScalar
//
//---------------------------------------------------------------------------
class CXformProject2ComputeScalar : public CXformImplementation
{
private:
public:
CXformProject2ComputeScalar(const CXformProject2ComputeScalar &) = delete;
// ctor
explicit CXformProject2ComputeScalar(CMemoryPool *mp);
// dtor
~CXformProject2ComputeScalar() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfProject2ComputeScalar;
}
const CHAR *
SzId() const override
{
return "CXformProject2ComputeScalar";
}
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle &exprhdl) const override
{
if (exprhdl.DeriveHasSubquery(1))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; // class CXformProject2ComputeScalar
} // namespace gpopt
#endif // !GPOPT_CXformProject2ComputeScalar_H
// EOF
相关信息
相关文章
greenplumn CJoinOrderGreedy 源码
greenplumn CJoinOrderMinCard 源码
greenplumn CSubqueryHandler 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦