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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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25
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.125 2007/02/19 07:03:31 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.126 2007/02/20 17:32:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -49,6 +49,15 @@ typedef enum InhOption
INH_DEFAULT /* Use current SQL_inheritance option */
} InhOption;
/* What to do at commit time for temporary relations */
typedef enum OnCommitAction
{
ONCOMMIT_NOOP, /* No ON COMMIT clause (do nothing) */
ONCOMMIT_PRESERVE_ROWS, /* ON COMMIT PRESERVE ROWS (do nothing) */
ONCOMMIT_DELETE_ROWS, /* ON COMMIT DELETE ROWS */
ONCOMMIT_DROP /* ON COMMIT DROP */
} OnCommitAction;
/*
* RangeVar - range variable, used in FROM clauses
*
@@ -69,6 +78,20 @@ typedef struct RangeVar
Alias *alias; /* table alias & optional column aliases */
} RangeVar;
/*
* IntoClause - target information for SELECT INTO and CREATE TABLE AS
*/
typedef struct IntoClause
{
NodeTag type;
RangeVar *rel; /* target relation name */
List *colNames; /* column names to assign, or NIL */
List *options; /* options from WITH clause */
OnCommitAction onCommit; /* what do we do at COMMIT? */
char *tableSpaceName; /* table space to use, or NULL */
} IntoClause;
/* ----------------------------------------------------------------
* node types for executable expressions