greenplumn placeholder 源码
greenplumn placeholder 代码
文件路径：/src/include/optimizer/placeholder.h
/*-------------------------------------------------------------------------
*
* placeholder.h
* prototypes for optimizer/util/placeholder.c.
*
*
* Portions Copyright (c) 2017, 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/placeholder.h
*
*-------------------------------------------------------------------------
*/
#ifndef PLACEHOLDER_H
#define PLACEHOLDER_H
#include "nodes/pathnodes.h"
extern PlaceHolderVar *make_placeholder_expr(PlannerInfo *root, Expr *expr,
Relids phrels);
extern PlaceHolderInfo *find_placeholder_info(PlannerInfo *root,
PlaceHolderVar *phv, bool create_new_ph);
extern void find_placeholders_in_jointree(PlannerInfo *root);
extern void update_placeholder_eval_levels(PlannerInfo *root,
SpecialJoinInfo *new_sjinfo);
extern void fix_placeholder_input_needed_levels(PlannerInfo *root);
extern void add_placeholders_to_base_rels(PlannerInfo *root);
extern void add_placeholders_to_joinrel(PlannerInfo *root, RelOptInfo *joinrel,
RelOptInfo *outer_rel, RelOptInfo *inner_rel);
extern void make_placeholders_for_subplans(PlannerInfo *root);
#endif /* PLACEHOLDER_H */
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