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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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23
src/backend/nodes/readfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.202 2007/02/03 14:06:54 petere Exp $
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.203 2007/02/20 17:32:15 tgl Exp $
*
* NOTES
* Path and Plan nodes do not have any readfuncs support, because we
@ -140,9 +140,6 @@ _readQuery(void)
READ_NODE_FIELD(utilityStmt);
READ_INT_FIELD(resultRelation);
READ_NODE_FIELD(into);
READ_NODE_FIELD(intoOptions);
READ_ENUM_FIELD(intoOnCommit, OnCommitAction);
READ_STRING_FIELD(intoTableSpaceName);
READ_BOOL_FIELD(hasAggs);
READ_BOOL_FIELD(hasSubLinks);
READ_NODE_FIELD(rtable);
@ -157,8 +154,6 @@ _readQuery(void)
READ_NODE_FIELD(limitCount);
READ_NODE_FIELD(rowMarks);
READ_NODE_FIELD(setOperations);
READ_NODE_FIELD(resultRelations);
READ_NODE_FIELD(returningLists);
READ_DONE();
}
@ -287,6 +282,20 @@ _readRangeVar(void)
READ_DONE();
}
static IntoClause *
_readIntoClause(void)
{
READ_LOCALS(IntoClause);
READ_NODE_FIELD(rel);
READ_NODE_FIELD(colNames);
READ_NODE_FIELD(options);
READ_ENUM_FIELD(onCommit, OnCommitAction);
READ_STRING_FIELD(tableSpaceName);
READ_DONE();
}
/*
* _readVar
*/
@ -984,6 +993,8 @@ parseNodeString(void)
return_value = _readAlias();
else if (MATCH("RANGEVAR", 8))
return_value = _readRangeVar();
else if (MATCH("INTOCLAUSE", 10))
return_value = _readIntoClause();
else if (MATCH("VAR", 3))
return_value = _readVar();
else if (MATCH("CONST", 5))