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First stage of reclaiming memory in executor by resetting short-term

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memory contexts.  Currently, only leaks in expressions executed as
quals or projections are handled.  Clean up some old dead cruft in
executor while at it --- unused fields in state nodes, that sort of thing.
This commit is contained in:
Tom Lane
2000-07-12 02:37:39 +00:00
parent 46fb9c29e2
commit badce86a2c
53 changed files with 1536 additions and 1584 deletions
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61
src/backend/executor/nodeNestloop.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.16 2000/06/15 04:09:52 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeNestloop.c,v 1.17 2000/07/12 02:37:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,18 +32,18 @@
*
* It scans the inner relation to join with current outer tuple.
*
* If none is found, next tuple form the outer relation is retrieved
* If none is found, next tuple from the outer relation is retrieved
* and the inner relation is scanned from the beginning again to join
* with the outer tuple.
*
* Nil is returned if all the remaining outer tuples are tried and
* NULL is returned if all the remaining outer tuples are tried and
* all fail to join with the inner tuples.
*
* Nil is also returned if there is no tuple from inner realtion.
* NULL is also returned if there is no tuple from inner relation.
*
* Conditions:
* -- outerTuple contains current tuple from outer relation and
* the right son(inner realtion) maintains "cursor" at the tuple
* the right son(inner relation) maintains "cursor" at the tuple
* returned previously.
* This is achieved by maintaining a scan position on the outer
* relation.
@ -60,10 +60,8 @@ ExecNestLoop(NestLoop *node, Plan *parent)
Plan *innerPlan;
Plan *outerPlan;
bool needNewOuterTuple;
TupleTableSlot *outerTupleSlot;
TupleTableSlot *innerTupleSlot;
List *qual;
ExprContext *econtext;
@ -77,11 +75,6 @@ ExecNestLoop(NestLoop *node, Plan *parent)
qual = node->join.qual;
outerPlan = outerPlan(&node->join);
innerPlan = innerPlan(&node->join);
/* ----------------
* initialize expression context
* ----------------
*/
econtext = nlstate->jstate.cs_ExprContext;
/* ----------------
@ -92,11 +85,18 @@ ExecNestLoop(NestLoop *node, Plan *parent)
econtext->ecxt_outertuple = outerTupleSlot;
/* ----------------
* Ok, everything is setup for the join so now loop until
* we return a qualifying join tuple..
* Reset per-tuple memory context to free any expression evaluation
* storage allocated in the previous tuple cycle.
* ----------------
*/
ResetExprContext(econtext);
/* ----------------
* Check to see if we're still projecting out tuples from a previous
* join tuple (because there is a function-returning-set in the
* projection expressions). If so, try to project another one.
* ----------------
*/
if (nlstate->jstate.cs_TupFromTlist)
{
TupleTableSlot *result;
@ -105,9 +105,17 @@ ExecNestLoop(NestLoop *node, Plan *parent)
result = ExecProject(nlstate->jstate.cs_ProjInfo, &isDone);
if (!isDone)
return result;
/* Done with that source tuple... */
nlstate->jstate.cs_TupFromTlist = false;
}
/* ----------------
* Ok, everything is setup for the join so now loop until
* we return a qualifying join tuple..
* ----------------
*/
ENL1_printf("entering main loop");
for (;;)
{
/* ----------------
@ -115,15 +123,7 @@ ExecNestLoop(NestLoop *node, Plan *parent)
* and join it with the current outer tuple.
* ----------------
*/
needNewOuterTuple = false;
if (!TupIsNull(outerTupleSlot))
ENL1_printf("have outer tuple, deal with it");
else
{
ENL1_printf("outer tuple is nil, need new outer tuple");
needNewOuterTuple = true;
}
needNewOuterTuple = TupIsNull(outerTupleSlot);
/* ----------------
* if we have an outerTuple, try to get the next inner tuple.
@ -229,9 +229,11 @@ ExecNestLoop(NestLoop *node, Plan *parent)
}
/* ----------------
* qualification failed so we have to try again..
* Tuple fails qual, so free per-tuple memory and try again.
* ----------------
*/
ResetExprContext(econtext);
ENL1_printf("qualification failed, looping");
}
}
@ -263,18 +265,14 @@ ExecInitNestLoop(NestLoop *node, EState *estate, Plan *parent)
* ----------------
*/
nlstate = makeNode(NestLoopState);
nlstate->nl_PortalFlag = false;
node->nlstate = nlstate;
/* ----------------
* Miscellanious initialization
* Miscellaneous initialization
*
* + assign node's base_id
* + assign debugging hooks and
* + create expression context for node
* ----------------
*/
ExecAssignNodeBaseInfo(estate, &nlstate->jstate, parent);
ExecAssignExprContext(estate, &nlstate->jstate);
#define NESTLOOP_NSLOTS 1
@ -348,6 +346,7 @@ ExecEndNestLoop(NestLoop *node)
* ----------------
*/
ExecFreeProjectionInfo(&nlstate->jstate);
ExecFreeExprContext(&nlstate->jstate);
/* ----------------
* close down subplans
@ -386,9 +385,7 @@ ExecReScanNestLoop(NestLoop *node, ExprContext *exprCtxt, Plan *parent)
if (outerPlan->chgParam == NULL)
ExecReScan(outerPlan, exprCtxt, (Plan *) node);
/* let outerPlan to free its result typle ... */
/* let outerPlan to free its result tuple ... */
nlstate->jstate.cs_OuterTupleSlot = NULL;
nlstate->jstate.cs_TupFromTlist = false;
return;
}