greenplumn subselect 源码

2022-08-18
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文件路径：/src/include/optimizer/subselect.h

/*-------------------------------------------------------------------------
 *
 * subselect.h
 *	  Planning routines for subselects.
 *
 * Portions Copyright (c) 2006-2008, Greenplum inc
 * Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/optimizer/subselect.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SUBSELECT_H
#define SUBSELECT_H

#include "nodes/pathnodes.h"
#include "nodes/plannodes.h"

#if 0
/* Not used in GPDB */
extern void SS_process_ctes(PlannerInfo *root);
#endif
extern Node *convert_testexpr(PlannerInfo *root,
				 Node *testexpr,
				 List *subst_nodes);
extern JoinExpr *convert_ANY_sublink_to_join(PlannerInfo *root,
											 SubLink *sublink,
											 Relids available_rels);
extern JoinExpr *convert_EXISTS_sublink_to_join(PlannerInfo *root,
												SubLink *sublink,
												bool under_not,
												Relids available_rels);
extern Node *remove_useless_EXISTS_sublink(PlannerInfo *root,
                                           Query *subselect, bool under_not);
extern Node *SS_replace_correlation_vars(PlannerInfo *root, Node *expr);
extern Node *SS_process_sublinks(PlannerInfo *root, Node *expr, bool isQual);
extern void SS_identify_outer_params(PlannerInfo *root);
extern void SS_charge_for_initplans(PlannerInfo *root, RelOptInfo *final_rel);
extern void SS_attach_initplans(PlannerInfo *root, Plan *plan);
extern void SS_finalize_plan(PlannerInfo *root, Plan *plan);
extern Param *SS_make_initplan_output_param(PlannerInfo *root,
											Oid resulttype, int32 resulttypmod,
											Oid resultcollation);
extern void SS_make_initplan_from_plan(PlannerInfo *root,
									   PlannerInfo *subroot, Plan *plan,
									   PlanSlice *subslice,
									   Param *prm, bool is_initplan_func_sublink);

extern bool IsSubqueryCorrelated(Query *sq);
extern bool IsSubqueryMultiLevelCorrelated(Query *sq);

extern List *generate_subquery_vars(PlannerInfo *root, List *tlist,
					   Index varno);
extern bool QueryHasDistributedRelation(Query *q, bool recursive);

#endif							/* SUBSELECT_H */

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