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First phase of plan-invalidation project: create a plan cache management

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module and teach PREPARE and protocol-level prepared statements to use it.
In service of this, rearrange utility-statement processing so that parse
analysis does not assume table schemas can't change before execution for
utility statements (necessary because we don't attempt to re-acquire locks
for utility statements when reusing a stored plan).  This requires some
refactoring of the ProcessUtility API, but it ends up cleaner anyway,
for instance we can get rid of the QueryContext global.

Still to do: fix up SPI and related code to use the plan cache; I'm tempted to
try to make SQL functions use it too.  Also, there are at least some aspects
of system state that we want to ensure remain the same during a replan as in
the original processing; search_path certainly ought to behave that way for
instance, and perhaps there are others.
This commit is contained in:
Tom Lane
2007-03-13 00:33:44 +00:00
parent f84308f195
commit b9527e9840
61 changed files with 2478 additions and 1354 deletions
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13
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.347 2007/03/08 17:03:31 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.348 2007/03/13 00:33:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -257,13 +257,14 @@ static Size PageGetFreeSpaceWithFillFactor(Relation relation, Page page);
* relation OIDs to be processed, and vacstmt->relation is ignored.
* (The non-NIL case is currently only used by autovacuum.)
*
* isTopLevel should be passed down from ProcessUtility.
*
* It is the caller's responsibility that both vacstmt and relids
* (if given) be allocated in a memory context that won't disappear
* at transaction commit. In fact this context must be QueryContext
* to avoid complaints from PreventTransactionChain.
* at transaction commit.
*/
void
vacuum(VacuumStmt *vacstmt, List *relids)
vacuum(VacuumStmt *vacstmt, List *relids, bool isTopLevel)
{
const char *stmttype = vacstmt->vacuum ? "VACUUM" : "ANALYZE";
volatile MemoryContext anl_context = NULL;
@@ -293,11 +294,11 @@ vacuum(VacuumStmt *vacstmt, List *relids)
*/
if (vacstmt->vacuum)
{
PreventTransactionChain((void *) vacstmt, stmttype);
PreventTransactionChain(isTopLevel, stmttype);
in_outer_xact = false;
}
else
in_outer_xact = IsInTransactionChain((void *) vacstmt);
in_outer_xact = IsInTransactionChain(isTopLevel);
/*
* Send info about dead objects to the statistics collector, unless we are