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Create hooks to let a loadable plugin monitor (or even replace) the planner

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and/or create plans for hypothetical situations; in particular, investigate
plans that would be generated using hypothetical indexes.  This is a
heavily-rewritten version of the hooks proposed by Gurjeet Singh for his
Index Advisor project.  In this formulation, the index advisor can be
entirely a loadable module instead of requiring a significant part to be
in the core backend, and plans can be generated for hypothetical indexes
without requiring the creation and rolling-back of system catalog entries.

The index advisor patch as-submitted is not compatible with these hooks,
but it needs significant work anyway due to other 8.2-to-8.3 planner
changes.  With these hooks in the core backend, development of the advisor
can proceed as a pgfoundry project.
This commit is contained in:
Tom Lane
2007-05-25 17:54:25 +00:00
parent ce5b24abed
commit 604ffd280b
9 changed files with 168 additions and 62 deletions
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18
src/include/commands/explain.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/explain.h,v 1.30 2007/03/13 00:33:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/explain.h,v 1.31 2007/05/25 17:54:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -15,6 +15,18 @@
#include "executor/executor.h"
/* Hook for plugins to get control in ExplainOneQuery() */
typedef void (*ExplainOneQuery_hook_type) (Query *query,
ExplainStmt *stmt,
const char *queryString,
ParamListInfo params,
TupOutputState *tstate);
extern DLLIMPORT ExplainOneQuery_hook_type ExplainOneQuery_hook;
/* Hook for plugins to get control in explain_get_index_name() */
typedef const char * (*explain_get_index_name_hook_type) (Oid indexId);
extern DLLIMPORT explain_get_index_name_hook_type explain_get_index_name_hook;
extern void ExplainQuery(ExplainStmt *stmt, const char *queryString,
ParamListInfo params, DestReceiver *dest);
@ -26,7 +38,7 @@ extern void ExplainOneUtility(Node *utilityStmt, ExplainStmt *stmt,
ParamListInfo params,
TupOutputState *tstate);
extern void ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt,
TupOutputState *tstate);
extern void ExplainOnePlan(PlannedStmt *plannedstmt, ParamListInfo params,
ExplainStmt *stmt, TupOutputState *tstate);
#endif /* EXPLAIN_H */