greenplumn CDXLScalarDistinctComp 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarDistinctComp.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarDistinctComp.cpp
/
/ @doc:
/ Implementation of DXL "is distinct from" comparison operator
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarDistinctComp.h"
#include "naucrates/dxl/CDXLUtils.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarDistinctComp::CDXLScalarDistinctComp
/
/ @doc:
/ Constructs a scalar distinct comparison node
/
/---------------------------------------------------------------------------
CDXLScalarDistinctComp::CDXLScalarDistinctComp(CMemoryPool *mp, IMDId *mdid_op)
: CDXLScalarComp(
mp, mdid_op,
GPOS_NEW(mp) CWStringConst(
mp, CDXLTokens::GetDXLTokenStr(EdxltokenEq)->GetBuffer()))
{
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarDistinctComp::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarDistinctComp::GetDXLOperator() const
{
return EdxlopScalarDistinct;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarDistinctComp::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarDistinctComp::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarDistinctComp);
;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarDistinctComp::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarDistinctComp::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
m_mdid->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenOpNo));
node->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarDistinctComp::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarDistinctComp::AssertValid(const CDXLNode *node,
BOOL validate_children) const
{
GPOS_ASSERT(EdxlscdistcmpSentinel == node->Arity());
CDXLNode *dxlnode_left = (*node)[EdxlscdistcmpIndexLeft];
CDXLNode *dxlnode_right = (*node)[EdxlscdistcmpIndexRight];
/ assert children are of right type (scalar)
GPOS_ASSERT(EdxloptypeScalar ==
dxlnode_left->GetOperator()->GetDXLOperatorType());
GPOS_ASSERT(EdxloptypeScalar ==
dxlnode_right->GetOperator()->GetDXLOperatorType());
GPOS_ASSERT(
GetComparisonOpName()->Equals(CDXLTokens::GetDXLTokenStr(EdxltokenEq)));
if (validate_children)
{
dxlnode_left->GetOperator()->AssertValid(dxlnode_left,
validate_children);
dxlnode_right->GetOperator()->AssertValid(dxlnode_right,
validate_children);
}
}
#endif / GPOS_DEBUG
/ EOF
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