greenplumn CDXLPhysicalHashJoin 源码
greenplumn CDXLPhysicalHashJoin 代码
文件路径:/src/backend/gporca/libnaucrates/src/operators/CDXLPhysicalHashJoin.cpp
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CDXLPhysicalHashJoin.cpp
//
// @doc:
// Implementation of DXL physical hash join operator
//---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLPhysicalHashJoin.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalHashJoin::CDXLPhysicalHashJoin
//
// @doc:
// Constructor
//
//---------------------------------------------------------------------------
CDXLPhysicalHashJoin::CDXLPhysicalHashJoin(CMemoryPool *mp,
EdxlJoinType join_type)
: CDXLPhysicalJoin(mp, join_type)
{
}
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalHashJoin::GetDXLOperator
//
// @doc:
// Operator type
//
//---------------------------------------------------------------------------
Edxlopid
CDXLPhysicalHashJoin::GetDXLOperator() const
{
return EdxlopPhysicalHashJoin;
}
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalHashJoin::GetOpNameStr
//
// @doc:
// Operator name
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLPhysicalHashJoin::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenPhysicalHashJoin);
}
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalHashJoin::SerializeToDXL
//
// @doc:
// Serialize operator in DXL format
//
//---------------------------------------------------------------------------
void
CDXLPhysicalHashJoin::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
xml_serializer->AddAttribute(CDXLTokens::GetDXLTokenStr(EdxltokenJoinType),
GetJoinTypeNameStr());
// serialize properties
node->SerializePropertiesToDXL(xml_serializer);
// serialize children
node->SerializeChildrenToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
// @function:
// CDXLPhysicalHashJoin::AssertValid
//
// @doc:
// Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLPhysicalHashJoin::AssertValid(const CDXLNode *node,
BOOL validate_children) const
{
// assert proj list and filter are valid
CDXLPhysical::AssertValid(node, validate_children);
GPOS_ASSERT(EdxlhjIndexSentinel == node->Arity());
GPOS_ASSERT(EdxljtSentinel > GetJoinType());
CDXLNode *join_filter = (*node)[EdxlhjIndexJoinFilter];
CDXLNode *hash_clauses = (*node)[EdxlhjIndexHashCondList];
CDXLNode *left = (*node)[EdxlhjIndexHashLeft];
CDXLNode *right = (*node)[EdxlhjIndexHashRight];
// assert children are of right type (physical/scalar)
GPOS_ASSERT(EdxlopScalarJoinFilter ==
join_filter->GetOperator()->GetDXLOperator());
GPOS_ASSERT(EdxlopScalarHashCondList ==
hash_clauses->GetOperator()->GetDXLOperator());
GPOS_ASSERT(EdxloptypePhysical ==
left->GetOperator()->GetDXLOperatorType());
GPOS_ASSERT(EdxloptypePhysical ==
right->GetOperator()->GetDXLOperatorType());
if (validate_children)
{
join_filter->GetOperator()->AssertValid(join_filter, validate_children);
hash_clauses->GetOperator()->AssertValid(hash_clauses,
validate_children);
left->GetOperator()->AssertValid(left, validate_children);
right->GetOperator()->AssertValid(right, validate_children);
}
}
#endif // GPOS_DEBUG
// EOF
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