greenplumn CDXLScalarArrayRef 代码
文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarArrayRef.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CDXLScalarArrayRef.cpp
/
/ @doc:
/ Implementation of DXL arrayrefs
/---------------------------------------------------------------------------
#include "naucrates/dxl/operators/CDXLScalarArrayRef.h"
#include "gpopt/mdcache/CMDAccessor.h"
#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpos;
using namespace gpdxl;
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::CDXLScalarArrayRef
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CDXLScalarArrayRef::CDXLScalarArrayRef(CMemoryPool *mp, IMDId *elem_type_mdid,
INT type_modifier,
IMDId *array_type_mdid,
IMDId *return_type_mdid)
: CDXLScalar(mp),
m_elem_type_mdid(elem_type_mdid),
m_type_modifier(type_modifier),
m_array_type_mdid(array_type_mdid),
m_return_type_mdid(return_type_mdid)
{
GPOS_ASSERT(m_elem_type_mdid->IsValid());
GPOS_ASSERT(m_array_type_mdid->IsValid());
GPOS_ASSERT(m_return_type_mdid->IsValid());
GPOS_ASSERT(m_return_type_mdid->Equals(m_elem_type_mdid) ||
m_return_type_mdid->Equals(m_array_type_mdid));
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::~CDXLScalarArrayRef
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CDXLScalarArrayRef::~CDXLScalarArrayRef()
{
m_elem_type_mdid->Release();
m_array_type_mdid->Release();
m_return_type_mdid->Release();
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::GetDXLOperator
/
/ @doc:
/ Operator type
/
/---------------------------------------------------------------------------
Edxlopid
CDXLScalarArrayRef::GetDXLOperator() const
{
return EdxlopScalarArrayRef;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::GetOpNameStr
/
/ @doc:
/ Operator name
/
/---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarArrayRef::GetOpNameStr() const
{
return CDXLTokens::GetDXLTokenStr(EdxltokenScalarArrayRef);
}
INT
CDXLScalarArrayRef::TypeModifier() const
{
return m_type_modifier;
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::SerializeToDXL
/
/ @doc:
/ Serialize operator in DXL format
/
/---------------------------------------------------------------------------
void
CDXLScalarArrayRef::SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const
{
const CWStringConst *element_name = GetOpNameStr();
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
m_elem_type_mdid->Serialize(
xml_serializer, CDXLTokens::GetDXLTokenStr(EdxltokenArrayElementType));
if (default_type_modifier != TypeModifier())
{
xml_serializer->AddAttribute(
CDXLTokens::GetDXLTokenStr(EdxltokenTypeMod), TypeModifier());
}
m_array_type_mdid->Serialize(
xml_serializer, CDXLTokens::GetDXLTokenStr(EdxltokenArrayType));
m_return_type_mdid->Serialize(xml_serializer,
CDXLTokens::GetDXLTokenStr(EdxltokenTypeId));
/ serialize child nodes
const ULONG arity = dxlnode->Arity();
GPOS_ASSERT(3 == arity || 4 == arity);
/ first 2 children are index lists
(*dxlnode)[0]->SerializeToDXL(xml_serializer);
(*dxlnode)[1]->SerializeToDXL(xml_serializer);
/ 3rd child is the ref expression
const CWStringConst *pstrRefExpr =
CDXLTokens::GetDXLTokenStr(EdxltokenScalarArrayRefExpr);
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), pstrRefExpr);
(*dxlnode)[2]->SerializeToDXL(xml_serializer);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), pstrRefExpr);
/ 4th child is the optional assign expression
const CWStringConst *pstrAssignExpr =
CDXLTokens::GetDXLTokenStr(EdxltokenScalarArrayRefAssignExpr);
xml_serializer->OpenElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), pstrAssignExpr);
if (4 == arity)
{
(*dxlnode)[3]->SerializeToDXL(xml_serializer);
}
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), pstrAssignExpr);
xml_serializer->CloseElement(
CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::HasBoolResult
/
/ @doc:
/ Does the operator return boolean result
/
/---------------------------------------------------------------------------
BOOL
CDXLScalarArrayRef::HasBoolResult(CMDAccessor *md_accessor) const
{
return (IMDType::EtiBool ==
md_accessor->RetrieveType(m_return_type_mdid)->GetDatumType());
}
#ifdef GPOS_DEBUG
/---------------------------------------------------------------------------
/ @function:
/ CDXLScalarArrayRef::AssertValid
/
/ @doc:
/ Checks whether operator node is well-structured
/
/---------------------------------------------------------------------------
void
CDXLScalarArrayRef::AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const
{
const ULONG arity = dxlnode->Arity();
for (ULONG ul = 0; ul < arity; ++ul)
{
CDXLNode *child_dxlnode = (*dxlnode)[ul];
GPOS_ASSERT(EdxloptypeScalar ==
child_dxlnode->GetOperator()->GetDXLOperatorType());
if (validate_children)
{
child_dxlnode->GetOperator()->AssertValid(child_dxlnode,
validate_children);
}
}
}
#endif / GPOS_DEBUG
/ EOF
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