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19e972d558
The original coding had three separate booleans representing partial
aggregation behavior, which was confusing, unreadable, and error-prone,
not least because the booleans weren't always listed in the same order.
It was also inadequate for the allegedly-desirable future extension to
support intermediate partial aggregation, because we'd need separate
markers for serialization and deserialization in such a case.
Merge these bools into an enum "AggSplit" to provide symbolic names for
the supported operating modes (and document what those are). By assigning
the values of the enum constants carefully, we can treat AggSplit values
as options bitmasks so that tests of what to do aren't noticeably more
expensive than before.
While at it, get rid of Aggref.aggoutputtype. That's not needed since
commit 59a3795c2 got rid of setrefs.c's special-purpose Aggref comparison
code, and it likewise seemed more confusing than helpful.
Assorted comment cleanup as well (there's still more that I want to do
in that line).
catversion bump for change in Aggref node contents. Should be the last
one for partial-aggregation changes.
Discussion: <29309.1466699160@sss.pgh.pa.us>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* planner.h
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* prototypes for planner.c.
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*
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*
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* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/optimizer/planner.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PLANNER_H
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#define PLANNER_H
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#include "nodes/plannodes.h"
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#include "nodes/relation.h"
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/* Hook for plugins to get control in planner() */
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typedef PlannedStmt *(*planner_hook_type) (Query *parse,
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int cursorOptions,
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ParamListInfo boundParams);
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extern PGDLLIMPORT planner_hook_type planner_hook;
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/* Hook for plugins to get control when grouping_planner() plans upper rels */
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typedef void (*create_upper_paths_hook_type) (PlannerInfo *root,
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UpperRelationKind stage,
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RelOptInfo *input_rel,
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RelOptInfo *output_rel);
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extern PGDLLIMPORT create_upper_paths_hook_type create_upper_paths_hook;
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extern PlannedStmt *planner(Query *parse, int cursorOptions,
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ParamListInfo boundParams);
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extern PlannedStmt *standard_planner(Query *parse, int cursorOptions,
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ParamListInfo boundParams);
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extern PlannerInfo *subquery_planner(PlannerGlobal *glob, Query *parse,
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PlannerInfo *parent_root,
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bool hasRecursion, double tuple_fraction);
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extern bool is_dummy_plan(Plan *plan);
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extern RowMarkType select_rowmark_type(RangeTblEntry *rte,
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LockClauseStrength strength);
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extern void mark_partial_aggref(Aggref *agg, AggSplit aggsplit);
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extern Path *get_cheapest_fractional_path(RelOptInfo *rel,
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double tuple_fraction);
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extern Expr *expression_planner(Expr *expr);
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extern Expr *preprocess_phv_expression(PlannerInfo *root, Expr *expr);
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extern bool plan_cluster_use_sort(Oid tableOid, Oid indexOid);
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#endif /* PLANNER_H */
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