greenplumn CDXLScalarWindowFrameEdge 源码

greenplumn CDXLScalarWindowFrameEdge 代码

文件路径：/src/backend/gporca/libnaucrates/src/operators/CDXLScalarWindowFrameEdge.cpp

//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2012 EMC Corp.
//
//	@filename:
//		CDXLScalarWindowFrameEdge.cpp
//
//	@doc:
//		Implementation of DXL scalar window frame edge
//---------------------------------------------------------------------------

#include "naucrates/dxl/operators/CDXLScalarWindowFrameEdge.h"

#include "naucrates/dxl/operators/CDXLNode.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"

using namespace gpos;
using namespace gpdxl;

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::CDXLScalarWindowFrameEdge
//
//	@doc:
//		Ctor
//
//---------------------------------------------------------------------------
CDXLScalarWindowFrameEdge::CDXLScalarWindowFrameEdge(
	CMemoryPool *mp, BOOL fLeading, EdxlFrameBoundary frame_boundary)
	: CDXLScalar(mp),
	  m_leading_edge(fLeading),
	  m_dxl_frame_boundary(frame_boundary)
{
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::GetDXLOperator
//
//	@doc:
//		Operator type
//
//---------------------------------------------------------------------------
Edxlopid
CDXLScalarWindowFrameEdge::GetDXLOperator() const
{
	return EdxlopScalarWindowFrameEdge;
}


//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::GetOpNameStr
//
//	@doc:
//		Operator name
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarWindowFrameEdge::GetOpNameStr() const
{
	if (m_leading_edge)
	{
		return CDXLTokens::GetDXLTokenStr(
			EdxltokenScalarWindowFrameLeadingEdge);
	}

	return CDXLTokens::GetDXLTokenStr(EdxltokenScalarWindowFrameTrailingEdge);
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::GetFrameBoundaryStr
//
//	@doc:
//		Return the string representation of the window frame boundary
//
//---------------------------------------------------------------------------
const CWStringConst *
CDXLScalarWindowFrameEdge::GetFrameBoundaryStr(EdxlFrameBoundary frame_boundary)
{
	GPOS_ASSERT(EdxlfbSentinel > frame_boundary);

	ULONG dxl_frame_boundary_token_mapping[][2] = {
		{EdxlfbUnboundedPreceding, EdxltokenWindowBoundaryUnboundedPreceding},
		{EdxlfbBoundedPreceding, EdxltokenWindowBoundaryBoundedPreceding},
		{EdxlfbCurrentRow, EdxltokenWindowBoundaryCurrentRow},
		{EdxlfbUnboundedFollowing, EdxltokenWindowBoundaryUnboundedFollowing},
		{EdxlfbBoundedFollowing, EdxltokenWindowBoundaryBoundedFollowing},
		{EdxlfbDelayedBoundedPreceding,
		 EdxltokenWindowBoundaryDelayedBoundedPreceding},
		{EdxlfbDelayedBoundedFollowing,
		 EdxltokenWindowBoundaryDelayedBoundedFollowing}};

	const ULONG arity = GPOS_ARRAY_SIZE(dxl_frame_boundary_token_mapping);
	for (ULONG idx = 0; idx < arity; idx++)
	{
		ULONG *element = dxl_frame_boundary_token_mapping[idx];
		if ((ULONG) frame_boundary == element[0])
		{
			Edxltoken dxl_token = (Edxltoken) element[1];
			return CDXLTokens::GetDXLTokenStr(dxl_token);
		}
	}

	GPOS_ASSERT(!"Unrecognized window frame boundary");
	return nullptr;
}

//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::SerializeToDXL
//
//	@doc:
//		Serialize operator in DXL format
//
//---------------------------------------------------------------------------
void
CDXLScalarWindowFrameEdge::SerializeToDXL(CXMLSerializer *xml_serializer,
										  const CDXLNode *dxlnode) const
{
	const CWStringConst *element_name = GetOpNameStr();
	xml_serializer->OpenElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);

	if (m_leading_edge)
	{
		xml_serializer->AddAttribute(
			CDXLTokens::GetDXLTokenStr(EdxltokenWindowLeadingBoundary),
			GetFrameBoundaryStr(m_dxl_frame_boundary));
	}
	else
	{
		xml_serializer->AddAttribute(
			CDXLTokens::GetDXLTokenStr(EdxltokenWindowTrailingBoundary),
			GetFrameBoundaryStr(m_dxl_frame_boundary));
	}

	dxlnode->SerializeChildrenToDXL(xml_serializer);
	xml_serializer->CloseElement(
		CDXLTokens::GetDXLTokenStr(EdxltokenNamespacePrefix), element_name);
}

#ifdef GPOS_DEBUG
//---------------------------------------------------------------------------
//	@function:
//		CDXLScalarWindowFrameEdge::AssertValid
//
//	@doc:
//		Checks whether operator node is well-structured
//
//---------------------------------------------------------------------------
void
CDXLScalarWindowFrameEdge::AssertValid(const CDXLNode *dxlnode,
									   BOOL validate_children) const
{
	const ULONG arity = dxlnode->Arity();
	GPOS_ASSERT(1 >= arity);

	GPOS_ASSERT_IMP((m_dxl_frame_boundary == EdxlfbBoundedPreceding ||
					 m_dxl_frame_boundary == EdxlfbBoundedFollowing ||
					 m_dxl_frame_boundary == EdxlfbDelayedBoundedPreceding ||
					 m_dxl_frame_boundary == EdxlfbDelayedBoundedFollowing),
					1 == arity);
	GPOS_ASSERT_IMP((m_dxl_frame_boundary == EdxlfbUnboundedPreceding ||
					 m_dxl_frame_boundary == EdxlfbUnboundedFollowing ||
					 m_dxl_frame_boundary == EdxlfbCurrentRow),
					0 == arity);

	for (ULONG idx = 0; idx < arity; ++idx)
	{
		CDXLNode *dxlnode_arg = (*dxlnode)[idx];
		GPOS_ASSERT(EdxloptypeScalar ==
					dxlnode_arg->GetOperator()->GetDXLOperatorType());

		if (validate_children)
		{
			dxlnode_arg->GetOperator()->AssertValid(dxlnode_arg,
													validate_children);
		}
	}
}
#endif	// GPOS_DEBUG

// EOF

相关信息

greenplumn 源码目录

相关文章

greenplumn CDXLColDescr 源码

greenplumn CDXLColRef 源码

greenplumn CDXLCtasStorageOptions 源码

greenplumn CDXLDatum 源码

greenplumn CDXLDatumBool 源码

greenplumn CDXLDatumGeneric 源码

greenplumn CDXLDatumInt2 源码

greenplumn CDXLDatumInt4 源码

greenplumn CDXLDatumInt8 源码

greenplumn CDXLDatumOid 源码