greenplumn CDistributionSpecStrictHashed 源码
greenplumn CDistributionSpecStrictHashed 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/base/CDistributionSpecStrictHashed.h
// Greenplum Database
// Copyright (C) 2016 VMware, Inc. or its affiliates.
#ifndef GPOPT_CDistributionSpecStrictHashed_H
#define GPOPT_CDistributionSpecStrictHashed_H
#include "gpopt/base/CDistributionSpecHashed.h"
namespace gpopt
{
// Class to represent a "forced" hashed distribution. Introduced to support
// parallel append, this distribution is meant to be incompatible with
// (or unsatisfiable by) most other distributions to force a motion.
class CDistributionSpecStrictHashed : public CDistributionSpecHashed
{
public:
CDistributionSpecStrictHashed(CExpressionArray *pdrgpexpr,
BOOL fNullsColocated);
EDistributionType Edt() const override;
const CHAR *
SzId() const override
{
return "STRICT HASHED";
}
};
} // namespace gpopt
#endif
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