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Expose more cursor-related functionality in SPI: specifically, allow

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access to the planner's cursor-related planning options, and provide new
FETCH/MOVE routines that allow access to the full power of those commands.
Small refactoring of planner(), pg_plan_query(), and pg_plan_queries()
APIs to make it convenient to pass the planning options down from SPI.

This is the core-code portion of Pavel Stehule's patch for scrollable
cursor support in plpgsql; I'll review and apply the plpgsql changes
separately.
This commit is contained in:
Tom Lane
2007-04-16 01:14:58 +00:00
parent fa92d21a48
commit 66888f7424
15 changed files with 435 additions and 71 deletions
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9
src/backend/optimizer/plan/planner.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.216 2007/02/27 01:11:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/planner.c,v 1.217 2007/04/16 01:14:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -80,8 +80,7 @@ static List *postprocess_setop_tlist(List *new_tlist, List *orig_tlist);
*
*****************************************************************************/
PlannedStmt *
planner(Query *parse, bool isCursor, int cursorOptions,
ParamListInfo boundParams)
planner(Query *parse, int cursorOptions, ParamListInfo boundParams)
{
PlannedStmt *result;
PlannerGlobal *glob;
@ -107,7 +106,7 @@ planner(Query *parse, bool isCursor, int cursorOptions,
glob->finalrtable = NIL;
/* Determine what fraction of the plan is likely to be scanned */
if (isCursor)
if (cursorOptions & CURSOR_OPT_FAST_PLAN)
{
/*
* We have no real idea how many tuples the user will ultimately FETCH
@ -130,7 +129,7 @@ planner(Query *parse, bool isCursor, int cursorOptions,
* If creating a plan for a scrollable cursor, make sure it can run
* backwards on demand. Add a Material node at the top at need.
*/
if (isCursor && (cursorOptions & CURSOR_OPT_SCROLL))
if (cursorOptions & CURSOR_OPT_SCROLL)
{
if (!ExecSupportsBackwardScan(top_plan))
top_plan = materialize_finished_plan(top_plan);