*
*
* 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 $
*
*-------------------------------------------------------------------------
*/
*/
#ifdef EXEC_MERGEJOINDEBUG
void
-ExecMergeTupleDumpInner(ExprContext *econtext);
+ ExecMergeTupleDumpInner(ExprContext *econtext);
void
ExecMergeTupleDumpInner(ExprContext *econtext)
}
void
-ExecMergeTupleDumpOuter(ExprContext *econtext);
+ ExecMergeTupleDumpOuter(ExprContext *econtext);
void
ExecMergeTupleDumpOuter(ExprContext *econtext)
outerSlot->ttc_tupleDescriptor);
}
-void
-ExecMergeTupleDumpMarked(ExprContext *econtext,
+void ExecMergeTupleDumpMarked(ExprContext *econtext,
MergeJoinState *mergestate);
void
}
void
-ExecMergeTupleDump(ExprContext *econtext, MergeJoinState *mergestate);
+ ExecMergeTupleDump(ExprContext *econtext, MergeJoinState *mergestate);
void
ExecMergeTupleDump(ExprContext *econtext, MergeJoinState *mergestate)
printf("******** \n");
}
+
#endif
/* ----------------------------------------------------------------
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
/* ----------------
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.
- * ----------------
+
+ /*
+ * 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))
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);
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.
*
* 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");
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;
}
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");
mergestate->mj_JoinState = EXEC_MJ_JOINTEST;
break;
- /*********************************
+ /*-------------------------------------------
* EXEC_MJ_NEXTOUTER means
*
- * outer inner
- * outer tuple - 5 5 - marked tuple
- * 5 5
- * 6 6 - inner tuple
- * 7 7
+ * outer inner
+ * outer tuple - 5 5 - marked tuple
+ * 5 5
+ * 6 6 - inner tuple
+ * 7 7
*
- * we know we just bumped into the
+ * we know we just bumped into the
* first inner tuple > current outer tuple
* 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");
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
* 7 12
*
*
- * new outer tuple > marked tuple
+ * new outer tuple > marked tuple
*
- *********************************/
+ *---------------------------------------------------------
+ */
case EXEC_MJ_TESTOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_TESTOUTER\n");
* tuple didn't match the marked outer tuple then
* we may have the case:
*
- * outer inner
- * 4 4 - marked tuple
- * new outer - 5 4
- * 6 nil - inner tuple
- * 7
+ * outer inner
+ * 4 4 - marked tuple
+ * new outer - 5 4
+ * 6 nil - inner tuple
+ * 7
*
* which means that all subsequent outer tuples will be
* larger than our inner tuples.
}
break;
- /*********************************
+ /*----------------------------------------------------------
* EXEC_MJ_SKIPOUTER means skip over tuples in the outer plan
* until we find an outer tuple > current inner tuple.
*
* For example:
*
- * outer inner
- * 5 5
- * 5 5
- * outer tuple - 6 8 - inner tuple
- * 7 12
- * 8 14
+ * outer inner
+ * 5 5
+ * 5 5
+ * outer tuple - 6 8 - inner tuple
+ * 7 12
+ * 8 14
*
* we have to advance the outer scan
* until we find the outer 8.
- *********************************/
+ *----------------------------------------------------------
+ */
case EXEC_MJ_SKIPOUTER:
MJ_printf("ExecMergeJoin: EXEC_MJ_SKIPOUTER\n");
/* ----------------
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.
*
* For example:
*
- * outer inner
- * 5 5
- * 5 5
- * outer tuple - 12 8 - inner tuple
- * 14 10
- * 17 12
+ * outer inner
+ * 5 5
+ * 5 5
+ * outer tuple - 12 8 - inner tuple
+ * 14 10
+ * 17 12
*
* we have to advance the inner scan
* until we find the inner 12.
*
- *********************************/
+ *-------------------------------------------------------
+ */
case EXEC_MJ_SKIPINNER:
MJ_printf("ExecMergeJoin: EXEC_MJ_SKIPINNER\n");
/* ----------------
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;
*/
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;
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;
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