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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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21
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.530 2007/03/29 19:10:10 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.531 2007/04/16 01:14:57 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -656,9 +656,12 @@ pg_rewrite_queries(List *querytree_list)
}
/* Generate a plan for a single already-rewritten query. */
/*
* Generate a plan for a single already-rewritten query.
* This is a thin wrapper around planner() and takes the same parameters.
*/
PlannedStmt *
pg_plan_query(Query *querytree, ParamListInfo boundParams)
pg_plan_query(Query *querytree, int cursorOptions, ParamListInfo boundParams)
{
PlannedStmt *plan;
@ -670,7 +673,7 @@ pg_plan_query(Query *querytree, ParamListInfo boundParams)
ResetUsage();
/* call the optimizer */
plan = planner(querytree, false, 0, boundParams);
plan = planner(querytree, cursorOptions, boundParams);
if (log_planner_stats)
ShowUsage("PLANNER STATISTICS");
@ -718,7 +721,7 @@ pg_plan_query(Query *querytree, ParamListInfo boundParams)
* list. Utility statements are simply represented by their statement nodes.
*/
List *
pg_plan_queries(List *querytrees, ParamListInfo boundParams,
pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams,
bool needSnapshot)
{
List *stmt_list = NIL;
@ -741,7 +744,7 @@ pg_plan_queries(List *querytrees, ParamListInfo boundParams,
ActiveSnapshot = CopySnapshot(GetTransactionSnapshot());
needSnapshot = false;
}
stmt = (Node *) pg_plan_query(query, boundParams);
stmt = (Node *) pg_plan_query(query, cursorOptions, boundParams);
}
stmt_list = lappend(stmt_list, stmt);
@ -892,7 +895,7 @@ exec_simple_query(const char *query_string)
querytree_list = pg_analyze_and_rewrite(parsetree, query_string,
NULL, 0);
plantree_list = pg_plan_queries(querytree_list, NULL, true);
plantree_list = pg_plan_queries(querytree_list, 0, NULL, true);
/* If we got a cancel signal in analysis or planning, quit */
CHECK_FOR_INTERRUPTS();
@ -1207,7 +1210,7 @@ exec_parse_message(const char *query_string, /* string to execute */
}
else
{
stmt_list = pg_plan_queries(querytree_list, NULL, true);
stmt_list = pg_plan_queries(querytree_list, 0, NULL, true);
fully_planned = true;
}
}
@ -1621,7 +1624,7 @@ exec_bind_message(StringInfo input_message)
*/
oldContext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
query_list = copyObject(cplan->stmt_list);
plan_list = pg_plan_queries(query_list, params, true);
plan_list = pg_plan_queries(query_list, 0, params, true);
MemoryContextSwitchTo(oldContext);
/* We no longer need the cached plan refcount ... */