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This commit is contained in:
Bruce Momjian 1999-02-24 10:20:07 +00:00
parent 02fa3e4394
commit f3f7c2acde
1 changed files with 89 additions and 78 deletions
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107
src/backend/executor/nodeMergejoin.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/executor/nodeMergejoin.c,v 1.23 1999/02/23 07:35:09 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/executor/nodeMergejoin.c,v 1.24 1999/02/24 10:20:07 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -321,8 +321,7 @@ ExecMergeTupleDumpOuter(ExprContext *econtext)
outerSlot->ttc_tupleDescriptor);
}
void
ExecMergeTupleDumpMarked(ExprContext *econtext,
void ExecMergeTupleDumpMarked(ExprContext *econtext,
MergeJoinState *mergestate);
void
@ -355,6 +354,7 @@ ExecMergeTupleDump(ExprContext *econtext, MergeJoinState *mergestate)
printf("******** \n");
}
#endif
/* ----------------------------------------------------------------
@ -427,11 +427,14 @@ ExecMergeJoin(MergeJoin *node)
ExprContext *econtext;
#ifdef ENABLE_OUTER_JOINS
/* These should be set from the expression context!
* - thomas 1999-02-20
/*
* These should be set from the expression context! - thomas
* 1999-02-20
*/
static bool isLeftJoin = true;
static bool isRightJoin = false;
#endif
/* ----------------
@ -486,19 +489,19 @@ ExecMergeJoin(MergeJoin *node)
switch (mergestate->mj_JoinState)
{
/*********************************
/*
* EXEC_MJ_INITIALIZE means that this is the first time
* ExecMergeJoin() has been called and so we have to initialize
* the inner, outer and marked tuples as well as various stuff
* in the expression context.
*********************************/
* ExecMergeJoin() has been called and so we have to
* initialize the inner, outer and marked tuples as well
* as various stuff in the expression context.
*/
case EXEC_MJ_INITIALIZE:
MJ_printf("ExecMergeJoin: EXEC_MJ_INITIALIZE\n");
/* ----------------
/*
* Note: at this point, if either of our inner or outer
* tuples are nil, then the join ends immediately because
* we know one of the subplans is empty.
* ----------------
*/
innerTupleSlot = ExecProcNode(innerPlan, (Plan *) node);
if (TupIsNull(innerTupleSlot))
@ -531,11 +534,12 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_SKIPINNER;
break;
/*********************************
* EXEC_MJ_JOINMARK means we have just found a new outer tuple
* and a possible matching inner tuple. This is the case after
* the INITIALIZE, SKIPOUTER or SKIPINNER states.
*********************************/
/*
* EXEC_MJ_JOINMARK means we have just found a new outer
* tuple and a possible matching inner tuple. This is the
* case after the INITIALIZE, SKIPOUTER or SKIPINNER
* states.
*/
case EXEC_MJ_JOINMARK:
MJ_printf("ExecMergeJoin: EXEC_MJ_JOINMARK\n");
ExecMarkPos(innerPlan);
@ -545,7 +549,7 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_JOINTEST;
break;
/*********************************
/*
* EXEC_MJ_JOINTEST means we have two tuples which might
* satisfy the merge clause, so we test them.
*
@ -553,7 +557,7 @@ ExecMergeJoin(MergeJoin *node)
* next inner tuple (EXEC_MJ_JOINTUPLES).
*
* If they do not satisfy then advance to next outer tuple.
*********************************/
*/
case EXEC_MJ_JOINTEST:
MJ_printf("ExecMergeJoin: EXEC_MJ_JOINTEST\n");
@ -566,11 +570,11 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_NEXTOUTER;
break;
/*********************************
/*
* EXEC_MJ_JOINTUPLES means we have two tuples which
* satisified the merge clause so we join them and then
* proceed to get the next inner tuple (EXEC_NEXT_INNER).
*********************************/
*/
case EXEC_MJ_JOINTUPLES:
MJ_printf("ExecMergeJoin: EXEC_MJ_JOINTUPLES\n");
mergestate->mj_JoinState = EXEC_MJ_NEXTINNER;
@ -599,11 +603,11 @@ ExecMergeJoin(MergeJoin *node)
}
break;
/*********************************
* EXEC_MJ_NEXTINNER means advance the inner scan to
* the next tuple. If the tuple is not nil, we then
* proceed to test it against the join qualification.
*********************************/
/*
* EXEC_MJ_NEXTINNER means advance the inner scan to the
* next tuple. If the tuple is not nil, we then proceed to
* test it against the join qualification.
*/
case EXEC_MJ_NEXTINNER:
MJ_printf("ExecMergeJoin: EXEC_MJ_NEXTINNER\n");
@ -621,7 +625,7 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_JOINTEST;
break;
/*********************************
/*-------------------------------------------
* EXEC_MJ_NEXTOUTER means
*
* outer inner
@ -635,7 +639,8 @@ ExecMergeJoin(MergeJoin *node)
* so get a new outer tuple and then
* proceed to test it against the marked tuple
* (EXEC_MJ_TESTOUTER)
*********************************/
*------------------------------------------------
*/
case EXEC_MJ_NEXTOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_NEXTOUTER\n");
@ -657,7 +662,7 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_TESTOUTER;
break;
/*********************************
/*--------------------------------------------------------
* EXEC_MJ_TESTOUTER If the new outer tuple and the marked
* tuple satisfy the merge clause then we know we have
* duplicates in the outer scan so we have to restore the
@ -689,7 +694,8 @@ ExecMergeJoin(MergeJoin *node)
*
* new outer tuple > marked tuple
*
*********************************/
*---------------------------------------------------------
*/
case EXEC_MJ_TESTOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_TESTOUTER\n");
@ -760,7 +766,7 @@ ExecMergeJoin(MergeJoin *node)
}
break;
/*********************************
/*----------------------------------------------------------
* EXEC_MJ_SKIPOUTER means skip over tuples in the outer plan
* until we find an outer tuple > current inner tuple.
*
@ -775,7 +781,8 @@ ExecMergeJoin(MergeJoin *node)
*
* we have to advance the outer scan
* until we find the outer 8.
*********************************/
*----------------------------------------------------------
*/
case EXEC_MJ_SKIPOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_SKIPOUTER\n");
/* ----------------
@ -867,7 +874,7 @@ ExecMergeJoin(MergeJoin *node)
mergestate->mj_JoinState = EXEC_MJ_JOINMARK;
break;
/*********************************
/*-----------------------------------------------------------
* EXEC_MJ_SKIPINNER means skip over tuples in the inner plan
* until we find an inner tuple > current outer tuple.
*
@ -883,7 +890,8 @@ ExecMergeJoin(MergeJoin *node)
* we have to advance the inner scan
* until we find the inner 12.
*
*********************************/
*-------------------------------------------------------
*/
case EXEC_MJ_SKIPINNER:
MJ_printf("ExecMergeJoin: EXEC_MJ_SKIPINNER\n");
/* ----------------
@ -997,11 +1005,13 @@ ExecMergeJoin(MergeJoin *node)
break;
#ifdef ENABLE_OUTER_JOINS
/*********************************
* EXEC_MJ_FILLINNER means we have an unmatched inner tuple
* which must be null-expanded into the projection tuple.
* get the next inner tuple and reset markers (EXEC_MJ_JOINMARK).
*********************************/
/*
* EXEC_MJ_FILLINNER means we have an unmatched inner
* tuple which must be null-expanded into the projection
* tuple. get the next inner tuple and reset markers
* (EXEC_MJ_JOINMARK).
*/
case EXEC_MJ_FILLINNER:
MJ_printf("ExecMergeJoin: EXEC_MJ_FILLINNER\n");
mergestate->mj_JoinState = EXEC_MJ_JOINMARK;
@ -1046,11 +1056,12 @@ ExecMergeJoin(MergeJoin *node)
*/
break;
/*********************************
* EXEC_MJ_FILLOUTER means we have an unmatched outer tuple
* which must be null-expanded into the projection tuple.
* get the next outer tuple and reset markers (EXEC_MJ_JOINMARK).
*********************************/
/*
* EXEC_MJ_FILLOUTER means we have an unmatched outer
* tuple which must be null-expanded into the projection
* tuple. get the next outer tuple and reset markers
* (EXEC_MJ_JOINMARK).
*/
case EXEC_MJ_FILLOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_FILLOUTER\n");
mergestate->mj_JoinState = EXEC_MJ_JOINMARK;
@ -1095,10 +1106,10 @@ ExecMergeJoin(MergeJoin *node)
break;
#endif
/*********************************
* if we get here it means our code is fouled up
* and so we just end the join prematurely.
*********************************/
/*
* if we get here it means our code is fouled up and so we
* just end the join prematurely.
*/
default:
elog(NOTICE, "ExecMergeJoin: invalid join state. aborting");
return NULL;