greenplumn cdbsetop 源码
greenplumn cdbsetop 代码
文件路径：/src/include/cdb/cdbsetop.h
/*-------------------------------------------------------------------------
*
* cdbsetop.h
*
* Portions Copyright (c) 2005-2008, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/cdb/cdbsetop.h
*
*-------------------------------------------------------------------------
*/
#ifndef CDBSETOP_H
#define CDBSETOP_H
#include "nodes/pg_list.h"
#include "nodes/pathnodes.h"
#include "nodes/plannodes.h"
/*
* GpSetOpType represents a strategy by which to construct a parallel
* execution plan for a set operation.
*
* PSETOP_PARALLEL_PARTITIONED
* The plans input to the Append node are (or are coerced to) partitioned
* loci (hashed, scattered, or single QE). The result of the Append is
* assumed to be scattered and unordered is redistributed (if necessary)
* to suit the particular set operation.
*
* PSETOP_SEQUENTIAL_QD
* The plans input to the Append node are (or are coerced to) root loci.
* The result of the Append is, therefore, root and unordered. The set
* operation is performed on the QD as if it were sequential.
*
* PSETOP_SEQUENTIAL_QE
* The plans input to the Append node are (or are coerced to) single QE
* loci. The result of the Append is, therefore, single QE and assumed
* unordered. The set operation is performed on the QE as if it were
* sequential.
*
* PSETOP_SEQUENTIAL_QE
* Similar to SEQUENTIAL_QD/QE, but the output must be made available
* to the outer query's locus. We don't know the outer query's locus yet,
* but we treat it sequential.
*
* PSETOP_GENERAL
* The plans input to the Append node are all general loci. The result
* of the Append is, therefore general as well.
*/
typedef enum GpSetOpType
{
PSETOP_NONE = 0,
PSETOP_PARALLEL_PARTITIONED,
PSETOP_SEQUENTIAL_QD,
PSETOP_SEQUENTIAL_QE,
PSETOP_SEQUENTIAL_OUTERQUERY,
PSETOP_GENERAL
} GpSetOpType;
extern
GpSetOpType choose_setop_type(List *pathlist);
extern
void adjust_setop_arguments(PlannerInfo *root, List *pathlist, List *tlist_list, GpSetOpType setop_type);
extern Path *make_motion_hash_all_targets(PlannerInfo *root, Path *subpath, List *tlist);
extern
void mark_append_locus(Path *path, GpSetOpType optype);
#endif /* CDBSETOP_H */
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