greenplumn CCastUtils 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CCastUtils.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2017 VMware, Inc. or its affiliates.
/
/ @filename:
/ CCastUtils.h
/
/ @doc:
/ Optimizer cast utility functions
/---------------------------------------------------------------------------
#ifndef GPOPT_CCastUtils_H
#define GPOPT_CCastUtils_H
#include "gpopt/base/CColRef.h"
#include "gpopt/operators/CExpression.h"
namespace gpmd
{
class IMDId;
}
namespace gpopt
{
using namespace gpos;
/ general cast utility functions
class CCastUtils
{
public:
/ is the given expression a binary coercible cast of a scalar identifier for the given column
static BOOL FBinaryCoercibleCastedScId(CExpression *pexpr, CColRef *colref);
/ is the given expression a binary coercible cast of a scalar identifier
static BOOL FBinaryCoercibleCastedScId(CExpression *pexpr);
static BOOL FBinaryCoercibleCastedConst(CExpression *pexpr);
/ extract the column reference if the given expression a scalar identifier
/ or a cast of a scalar identifier or a function that casts a scalar identifier.
/ Else return NULL.
static const CColRef *PcrExtractFromScIdOrCastScId(CExpression *pexpr);
/ cast the input column reference to the destination mdid
static CExpression *PexprCast(CMemoryPool *mp, CMDAccessor *md_accessor,
const CColRef *colref, IMDId *mdid_dest);
/ check whether the given expression is a binary coercible cast of something
static BOOL FBinaryCoercibleCast(CExpression *pexpr);
/ check whether the given expression is a cast of something
static BOOL FScalarCast(CExpression *pexpr);
/ return the given expression without any binary coercible casts
/ that exist on the top
static CExpression *PexprWithoutBinaryCoercibleCasts(CExpression *pexpr);
/ add explicit casting to equality operations between compatible types
static CExpressionArray *PdrgpexprCastEquality(CMemoryPool *mp,
CExpression *pexpr);
/ helper to add explicit casting to left child of given equality predicate
static CExpression *PexprAddCast(CMemoryPool *mp, CExpression *pexprPred);
/ add explicit casting on the input expression to the destination type
static CExpression *PexprCast(CMemoryPool *mp, CMDAccessor *md_accessor,
CExpression *pexpr, IMDId *mdid_dest);
}; / class CCastUtils
} / namespace gpopt
#endif / !GPOPT_CCastUtils_H
/ EOF
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