greenplumn IMDCast 源码
greenplumn IMDCast 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/md/IMDCast.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// IMDCast.h
//
// @doc:
// Interface for cast functions in the metadata cache
//---------------------------------------------------------------------------
#ifndef GPMD_IMDCast_H
#define GPMD_IMDCast_H
#include "gpos/base.h"
#include "naucrates/md/IMDCacheObject.h"
namespace gpmd
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// IMDCast
//
// @doc:
// Interface for cast functions in the metadata cache
//
//---------------------------------------------------------------------------
class IMDCast : public IMDCacheObject
{
public:
// type of coercion pathway
enum EmdCoercepathType
{
EmdtNone, /* failed to find any coercion pathway */
EmdtFunc, /* apply the specified coercion function */
EmdtRelabelType, /* binary-compatible cast, no function */
EmdtArrayCoerce, /* need an ArrayCoerceExpr node */
EmdtCoerceViaIO /* need a CoerceViaIO, no function */
};
// object type
Emdtype
MDType() const override
{
return EmdtCastFunc;
}
// source type
virtual IMDId *MdidSrc() const = 0;
// destination type
virtual IMDId *MdidDest() const = 0;
// is the cast between binary coercible types, i.e. the types are binary compatible
virtual BOOL IsBinaryCoercible() const = 0;
// cast function id
virtual IMDId *GetCastFuncMdId() const = 0;
// return the coercion path type
virtual EmdCoercepathType GetMDPathType() const = 0;
};
} // namespace gpmd
#endif // !GPMD_IMDCast_H
// EOF
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