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Remove the Query structure from the executor's API. This allows us to stop

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storing mostly-redundant Query trees in prepared statements, portals, etc.
To replace Query, a new node type called PlannedStmt is inserted by the
planner at the top of a completed plan tree; this carries just the fields of
Query that are still needed at runtime.  The statement lists kept in portals
etc. now consist of intermixed PlannedStmt and bare utility-statement nodes
--- no Query.  This incidentally allows us to remove some fields from Query
and Plan nodes that shouldn't have been there in the first place.

Still to do: simplify the execution-time range table; at the moment the
range table passed to the executor still contains Query trees for subqueries.

initdb forced due to change of stored rules.
This commit is contained in:
Tom Lane
2007-02-20 17:32:18 +00:00
parent 71b0cf2f6b
commit 9cbd0c155d
39 changed files with 1172 additions and 897 deletions
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3
src/include/commands/portalcmds.h
View File

@@ -7,13 +7,14 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/portalcmds.h,v 1.20 2007/01/05 22:19:53 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/portalcmds.h,v 1.21 2007/02/20 17:32:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PORTALCMDS_H
#define PORTALCMDS_H
#include "nodes/parsenodes.h"
#include "utils/portal.h"

16
src/include/commands/prepare.h
View File

@@ -6,7 +6,7 @@
*
* Copyright (c) 2002-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.23 2007/01/05 22:19:53 momjian Exp $
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.24 2007/02/20 17:32:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,6 +19,10 @@
/*
* The data structure representing a prepared statement
*
* A prepared statement might be fully planned, or only parsed-and-rewritten.
* If fully planned, stmt_list contains PlannedStmts and/or utility statements;
* if not, it contains Query nodes.
*
* Note: all subsidiary storage lives in the context denoted by the context
* field. However, the string referenced by commandTag is not subsidiary
* storage; it is assumed to be a compile-time-constant string. As with
@@ -31,11 +35,11 @@ typedef struct
char stmt_name[NAMEDATALEN];
char *query_string; /* text of query, or NULL */
const char *commandTag; /* command tag (a constant!), or NULL */
List *query_list; /* list of queries, rewritten */
List *plan_list; /* list of plans */
List *stmt_list; /* list of statement or Query nodes */
List *argtype_list; /* list of parameter type OIDs */
bool fully_planned; /* what is in stmt_list, exactly? */
bool from_sql; /* prepared via SQL, not FE/BE protocol? */
TimestampTz prepare_time; /* the time when the stmt was prepared */
bool from_sql; /* stmt prepared via SQL, not FE/BE protocol? */
MemoryContext context; /* context containing this query */
} PreparedStatement;
@@ -52,9 +56,9 @@ extern void ExplainExecuteQuery(ExplainStmt *stmt, ParamListInfo params,
extern void StorePreparedStatement(const char *stmt_name,
const char *query_string,
const char *commandTag,
List *query_list,
List *plan_list,
List *stmt_list,
List *argtype_list,
bool fully_planned,
bool from_sql);
extern PreparedStatement *FetchPreparedStatement(const char *stmt_name,
bool throwError);