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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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34
src/backend/optimizer/util/clauses.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.237 2007/03/06 22:45:16 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/clauses.c,v 1.238 2007/03/13 00:33:41 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -3603,38 +3603,6 @@ query_tree_walker(Query *query,
return true;
if (range_table_walker(query->rtable, walker, context, flags))
return true;
if (query->utilityStmt)
{
/*
* Certain utility commands contain general-purpose Querys embedded in
* them --- if this is one, invoke the walker on the sub-Query.
*/
if (IsA(query->utilityStmt, CopyStmt))
{
if (walker(((CopyStmt *) query->utilityStmt)->query, context))
return true;
}
if (IsA(query->utilityStmt, DeclareCursorStmt))
{
if (walker(((DeclareCursorStmt *) query->utilityStmt)->query, context))
return true;
}
if (IsA(query->utilityStmt, ExplainStmt))
{
if (walker(((ExplainStmt *) query->utilityStmt)->query, context))
return true;
}
if (IsA(query->utilityStmt, PrepareStmt))
{
if (walker(((PrepareStmt *) query->utilityStmt)->query, context))
return true;
}
if (IsA(query->utilityStmt, ViewStmt))
{
if (walker(((ViewStmt *) query->utilityStmt)->query, context))
return true;
}
}
return false;
}