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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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6
src/backend/bootstrap/bootparse.y
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.87 2007/03/07 13:35:02 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.88 2007/03/13 00:33:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -252,7 +252,7 @@ Boot_DeclareIndexStmt:
LexIDStr($8),
NULL,
$10,
NULL, NIL, NIL,
NULL, NIL,
false, false, false,
false, false, true, false, false);
do_end();
@ -270,7 +270,7 @@ Boot_DeclareUniqueIndexStmt:
LexIDStr($9),
NULL,
$11,
NULL, NIL, NIL,
NULL, NIL,
true, false, false,
false, false, true, false, false);
do_end();