greenplumn CDXLScalarAggref 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarAggref.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 Greenplum, Inc.
/
/ @filename:
/ CDXLScalarAggref.h
/
/ @doc:
/ Class for representing DXL AggRef
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarAggref_H
#define GPDXL_CDXLScalarAggref_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
enum Edxlascalarggref
{
EdxlscalaraggrefIndexArgs = 0,
EdxlscalaraggrefIndexDirectArgs,
EdxlscalaraggrefIndexAggOrder,
EdxlscalaraggrefIndexAggDistinct,
};
enum EdxlAggrefStage
{
EdxlaggstageNormal = 0,
EdxlaggstagePartial, / First (lower, earlier) stage of 2-stage aggregation.
EdxlaggstageIntermediate, / Between AGGSTAGE_PARTIAL and AGGSTAGE_FINAL that handles the higher aggregation
/ level in a (partial) ROLLUP grouping extension query
EdxlaggstageFinal, / Second (upper, later) stage of 2-stage aggregation.
EdxlaggstageSentinel
};
enum EdxlAggrefKind
{
EdxlaggkindNormal = 0,
EdxlaggkindOrderedSet,
EdxlaggkindHypothetical
};
/---------------------------------------------------------------------------
/ @class:
/ CDXLScalarAggref
/
/ @doc:
/ Class for representing DXL AggRef
/
/---------------------------------------------------------------------------
class CDXLScalarAggref : public CDXLScalar
{
private:
/ catalog id of the function
IMDId *m_agg_func_mdid;
/ resolved return type refers to a non-ambiguous type that was resolved during query
/ parsing if the actual return type of Agg is ambiguous (e.g., AnyElement in GPDB)
/ if resolved return type is NULL, then we can get Agg return type by looking up MD cache
/ using Agg MDId
IMDId *m_resolved_rettype_mdid;
/ Denotes whether it's agg(DISTINCT ...)
BOOL m_is_distinct;
/ Denotes the MPP Stage
EdxlAggrefStage m_agg_stage;
EdxlAggrefKind m_aggkind;
ULongPtrArray *m_argtypes;
public:
CDXLScalarAggref(const CDXLScalarAggref &) = delete;
/ ctor/dtor
CDXLScalarAggref(CMemoryPool *mp, IMDId *agg_mdid, IMDId *resolved_rettype,
BOOL is_distinct, EdxlAggrefStage agg_stage,
EdxlAggrefKind aggkind, ULongPtrArray *argtypes);
~CDXLScalarAggref() override;
/ ident accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
IMDId *GetDXLAggFuncMDid() const;
IMDId *GetDXLResolvedRetTypeMDid() const;
const CWStringConst *GetDXLStrAggStage() const;
EdxlAggrefStage GetDXLAggStage() const;
const CWStringConst *GetDXLStrAggKind() const;
BOOL IsDistinct() const;
EdxlAggrefKind
GetAggKind() const
{
return m_aggkind;
}
ULongPtrArray *
GetArgTypes() const
{
return m_argtypes;
}
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
void SerializeValuesListChildToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode, ULONG index,
const CHAR *attr_name) const;
/ conversion function
static CDXLScalarAggref *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarAggref == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarAggref *>(dxl_op);
}
/ does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLScalarAggref_H
/ EOF
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