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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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7
src/backend/commands/dbcommands.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.192 2007/02/09 16:12:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.193 2007/03/13 00:33:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -97,9 +97,6 @@ createdb(const CreatedbStmt *stmt)
int encoding = -1;
int dbconnlimit = -1;
/* don't call this in a transaction block */
PreventTransactionChain((void *) stmt, "CREATE DATABASE");
/* Extract options from the statement node tree */
foreach(option, stmt->options)
{
@ -545,8 +542,6 @@ dropdb(const char *dbname, bool missing_ok)
Relation pgdbrel;
HeapTuple tup;
PreventTransactionChain((void *) dbname, "DROP DATABASE");
AssertArg(dbname);
if (strcmp(dbname, get_database_name(MyDatabaseId)) == 0)