greenplumn CScalarCast 源码
greenplumn CScalarCast 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarCast.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarCast.h
//
// @doc:
// Scalar casting operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarCast_H
#define GPOPT_CScalarCast_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarCast
//
// @doc:
// Scalar casting operator
//
//---------------------------------------------------------------------------
class CScalarCast : public CScalar
{
private:
// return type metadata id in the catalog
IMDId *m_return_type_mdid;
// function to be used for casting
IMDId *m_func_mdid;
// whether or not this cast is binary coercible
BOOL m_is_binary_coercible;
// does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
// is operator's return type BOOL?
BOOL m_fBoolReturnType;
public:
CScalarCast(const CScalarCast &) = delete;
// ctor
CScalarCast(CMemoryPool *mp, IMDId *return_type_mdid, IMDId *mdid_func,
BOOL is_binary_coercible);
// dtor
~CScalarCast() override
{
m_func_mdid->Release();
m_return_type_mdid->Release();
}
// ident accessors
// the type of the scalar expression
IMDId *
MdidType() const override
{
return m_return_type_mdid;
}
// func that casts
IMDId *
FuncMdId() const
{
return m_func_mdid;
}
EOperatorId
Eopid() const override
{
return EopScalarCast;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarCast";
}
// match function
BOOL Matches(COperator *) const override;
// sensitivity to order of inputs
BOOL
FInputOrderSensitive() const override
{
return false;
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// whether or not this cast is binary coercible
BOOL
IsBinaryCoercible() const
{
return m_is_binary_coercible;
}
// boolean expression evaluation
EBoolEvalResult
Eber(ULongPtrArray *pdrgpulChildren) const override
{
return EberNullOnAllNullChildren(pdrgpulChildren);
}
// conversion function
static CScalarCast *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarCast == pop->Eopid());
return dynamic_cast<CScalarCast *>(pop);
}
}; // class CScalarCast
} // namespace gpopt
#endif // !GPOPT_CScalarCast_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
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