greenplumn CDXLLogicalSetOp 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalSetOp.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CDXLLogicalSetOp.h
/
/ @doc:
/ Class for representing DXL logical set operators
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalSetOp_H
#define GPDXL_CDXLLogicalSetOp_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLColDescr.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
namespace gpdxl
{
enum EdxlSetOpType
{
EdxlsetopUnion,
EdxlsetopUnionAll,
EdxlsetopIntersect,
EdxlsetopIntersectAll,
EdxlsetopDifference,
EdxlsetopDifferenceAll,
EdxlsetopSentinel
};
/---------------------------------------------------------------------------
/ @class:
/ CDXLLogicalSetOp
/
/ @doc:
/ Class for representing DXL logical set operators
/
/---------------------------------------------------------------------------
class CDXLLogicalSetOp : public CDXLLogical
{
private:
/ set operation type
EdxlSetOpType m_set_operation_dxl_type;
/ list of output column descriptors
CDXLColDescrArray *m_col_descr_array;
/ array of input colid arrays
ULongPtr2dArray *m_input_colids_arrays;
/ do the columns need to be casted accross inputs
BOOL m_cast_across_input_req;
public:
CDXLLogicalSetOp(CDXLLogicalSetOp &) = delete;
/ ctor
CDXLLogicalSetOp(CMemoryPool *mp, EdxlSetOpType edxlsetoptype,
CDXLColDescrArray *pdrgdxlcd, ULongPtr2dArray *array_2D,
BOOL fCastAcrossInput);
/ dtor
~CDXLLogicalSetOp() override;
/ operator id
Edxlopid GetDXLOperator() const override;
/ operator name
const CWStringConst *GetOpNameStr() const override;
/ set operator type
EdxlSetOpType
GetSetOpType() const
{
return m_set_operation_dxl_type;
}
/ array of output columns
const CDXLColDescrArray *
GetDXLColumnDescrArray() const
{
return m_col_descr_array;
}
/ number of output columns
ULONG
Arity() const
{
return m_col_descr_array->Size();
}
/ output column descriptor at a given position
const CDXLColDescr *
GetColumnDescrAt(ULONG idx) const
{
return (*m_col_descr_array)[idx];
}
/ number of inputs to the n-ary set operation
ULONG
ChildCount() const
{
return m_input_colids_arrays->Size();
}
/ column array of the input at a given position
const ULongPtrArray *
GetInputColIdArrayAt(ULONG idx) const
{
GPOS_ASSERT(idx < ChildCount());
return (*m_input_colids_arrays)[idx];
}
/ do the columns across inputs need to be casted
BOOL
IsCastAcrossInputReq() const
{
return m_cast_across_input_req;
}
/ serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
/ check if given column is defined by operator
BOOL IsColDefined(ULONG colid) const override;
/ conversion function
static CDXLLogicalSetOp *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalSetOp == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalSetOp *>(dxl_op);
}
#ifdef GPOS_DEBUG
/ checks whether the operator has valid structure, i.e. number and
/ types of child nodes
void AssertValid(const CDXLNode *, BOOL validate_children) const override;
#endif / GPOS_DEBUG
};
} / namespace gpdxl
#endif / !GPDXL_CDXLLogicalSetOp_H
/ EOF
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