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
相关信息
相关文章
greenplumn CColConstraintsArrayMapper 源码