greenplumn CDXLScalarFuncExpr 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarFuncExpr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarFuncExpr.cpp
/
/ @doc:
/ Implementation of DXL Scalar FuncExpr
/
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarFuncExpr.h"
#include "gpopt/mdcache/CMDAccessor.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpopt;
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::CDXLScalarFuncExpr
/
/ @doc:
/ Constructs a scalar FuncExpr node
/
/---------------------------------------------------------------------------
CDXLScalarFuncExpr::CDXLScalarFuncExpr(CMemoryPool *mp, IMDId *mdid_func,
IMDId *mdid_return_type,
INT return_type_modifier, BOOL fRetSet)
: CDXLScalar(mp),
m_func_mdid(mdid_func),
m_return_type_mdid(mdid_return_type),
m_return_type_modifier(return_type_modifier),
m_returns_set(fRetSet)
{
GPOS_ASSERT(m_func_mdid->IsValid());
GPOS_ASSERT(m_return_type_mdid->IsValid());
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::~CDXLScalarFuncExpr
/
/ @doc:
/ Destructor
/
/---------------------------------------------------------------------------
CDXLScalarFuncExpr::~CDXLScalarFuncExpr()
{
m_func_mdid->Release();
m_return_type_mdid->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarFuncExpr::GetDXLOperator() const
{
return EdxlopScalarFuncExpr;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarFuncExpr::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarFuncExpr);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::FuncMdId
/
/ @doc:
/ Returns function id
/
/---------------------------------------------------------------------------
IMDId *
CDXLScalarFuncExpr::FuncMdId() const
{
return m_func_mdid;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::ReturnTypeMdId
/
/ @doc:
/ Return type
/
/---------------------------------------------------------------------------
IMDId *
CDXLScalarFuncExpr::ReturnTypeMdId() const
{
return m_return_type_mdid;
}
INT
CDXLScalarFuncExpr::TypeModifier() const
{
return m_return_type_modifier;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::ReturnsSet
/
/ @doc:
/ Returns whether the function returns a set
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarFuncExpr::ReturnsSet() const
{
return m_returns_set;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarFuncExpr::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
m_func_mdid->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenFuncId));
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenFuncRetSet), m_returns_set);
m_return_type_mdid->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenTypeId));
if (default_type_modifier != TypeModifier())
{
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenTypeMod), TypeModifier());
}
dxlnode->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::HasBoolResult
/
/ @doc:
/ Does the operator return boolean result
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarFuncExpr::HasBoolResult(CMDAccessor *md_accessor) const
{
IMDId *mdid = md_accessor->RetrieveFunc(m_func_mdid)->GetResultTypeMdid();
return (IMDType::EtiBool ==
md_accessor->RetrieveType(mdid)->GetDatumType());
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarFuncExpr::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarFuncExpr::AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const
{
for (ULONG ul = 0; ul < dxlnode->Arity(); ++ul)
{
CDXLNode *dxlnode_arg = (*dxlnode)[ul];
GPOS_ASSERT(EdxloptypeScalar ==
dxlnode_arg->GetOperator()->GetDXLOperatorType());
if (validate_children)
{
dxlnode_arg->GetOperator()->AssertValid(dxlnode_arg,
validate_children);
}
}
}
#endif / GPOS_DEBUG
/ EOF
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