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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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4
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.369 2007/02/27 01:11:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/copyfuncs.c,v 1.370 2007/03/13 00:33:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2142,7 +2142,6 @@ _copyIndexStmt(IndexStmt *from)
COPY_NODE_FIELD(indexParams);
COPY_NODE_FIELD(options);
COPY_NODE_FIELD(whereClause);
COPY_NODE_FIELD(rangetable);
COPY_SCALAR_FIELD(unique);
COPY_SCALAR_FIELD(primary);
COPY_SCALAR_FIELD(isconstraint);
@ -2785,7 +2784,6 @@ _copyPrepareStmt(PrepareStmt *from)
COPY_STRING_FIELD(name);
COPY_NODE_FIELD(argtypes);
COPY_NODE_FIELD(argtype_oids);
COPY_NODE_FIELD(query);
return newnode;