greenplumn CFunctionProp 源码
greenplumn CFunctionProp 代码
文件路径：/src/backend/gporca/libgpopt/src/base/CFunctionProp.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CFunctionProp.cpp
//
// @doc:
// Implementation of function properties
//---------------------------------------------------------------------------
#include "gpopt/base/CFunctionProp.h"
#include "gpos/base.h"
using namespace gpopt;
FORCE_GENERATE_DBGSTR(CFunctionProp);
//---------------------------------------------------------------------------
// @function:
// CFunctionProp::CFunctionProp
//
// @doc:
// Ctor
//
//---------------------------------------------------------------------------
CFunctionProp::CFunctionProp(IMDFunction::EFuncStbl func_stability,
BOOL fHasVolatileFunctionScan, BOOL fScan)
: m_efs(func_stability),
m_fHasVolatileFunctionScan(fHasVolatileFunctionScan),
m_fScan(fScan)
{
GPOS_ASSERT(IMDFunction::EfsSentinel > func_stability);
GPOS_ASSERT_IMP(fScan && IMDFunction::EfsVolatile == func_stability,
fHasVolatileFunctionScan);
}
//---------------------------------------------------------------------------
// @function:
// CFunctionProp::~CFunctionProp
//
// @doc:
// Dtor
//
//---------------------------------------------------------------------------
CFunctionProp::~CFunctionProp() = default;
//---------------------------------------------------------------------------
// @function:
// CFunctionProp::SingletonExecution
//
// @doc:
// Check if must execute on a single host based on function properties
//
//---------------------------------------------------------------------------
BOOL
CFunctionProp::NeedsSingletonExecution() const
{
// a function needs to execute on a single host if any of the following holds:
// a) it reads or modifies SQL data
// b) it is volatile and used as a scan operator (i.e. in the from clause)
// TODO: - Feb 10, 2014; enable the following line instead of the
// current return statement once all function properties are fixed
//return (IMDFunction::EfdaContainsSQL < m_efda || (m_fScan && IMDFunction::EfsVolatile == m_efs));
return m_fScan && (IMDFunction::EfsVolatile == m_efs ||
IMDFunction::EfsStable == m_efs);
}
//---------------------------------------------------------------------------
// @function:
// CFunctionProp::OsPrint
//
// @doc:
// debug print
//
//---------------------------------------------------------------------------
IOstream &
CFunctionProp::OsPrint(IOstream &os) const
{
const CHAR *rgszStability[] = {"Immutable", "Stable", "Volatile"};
os << rgszStability[m_efs];
return os;
}
// EOF
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