|
3 | 3 | *back to source text |
4 | 4 | * |
5 | 5 | * IDENTIFICATION |
6 | | - * $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.211 2005/12/28 01:30:00 tgl Exp $ |
| 6 | + * $PostgreSQL: pgsql/src/backend/utils/adt/ruleutils.c,v 1.212 2005/12/30 18:34:22 tgl Exp $ |
7 | 7 | * |
8 | 8 | * This software is copyrighted by Jan Wieck - Hamburg. |
9 | 9 | * |
@@ -1525,8 +1525,15 @@ deparse_context_for_subplan(const char *name, List *tlist, |
1525 | 1525 | attrs=lappend(attrs,makeString(pstrdup(buf))); |
1526 | 1526 | } |
1527 | 1527 |
|
1528 | | -rte->rtekind=RTE_SPECIAL;/* XXX */ |
| 1528 | +/* |
| 1529 | + * We create an RTE_SPECIAL RangeTblEntry, and store the given tlist |
| 1530 | + * in its coldeflist field. This is a hack to make the tlist available |
| 1531 | + * to get_name_for_var_field(). RTE_SPECIAL nodes shouldn't appear in |
| 1532 | + * deparse contexts otherwise. |
| 1533 | + */ |
| 1534 | +rte->rtekind=RTE_SPECIAL; |
1529 | 1535 | rte->relid=InvalidOid; |
| 1536 | +rte->coldeflist=tlist; |
1530 | 1537 | rte->eref=makeAlias(name,attrs); |
1531 | 1538 | rte->inh= false; |
1532 | 1539 | rte->inFromCl= true; |
@@ -2571,7 +2578,8 @@ get_names_for_var(Var *var, int levelsup, deparse_context *context, |
2571 | 2578 | * Note: this has essentially the same logic as the parser's |
2572 | 2579 | * expandRecordVariable() function, but we are dealing with a different |
2573 | 2580 | * representation of the input context, and we only need one field name not |
2574 | | - * a TupleDesc. |
| 2581 | + * a TupleDesc. Also, we have a special case for RTE_SPECIAL so that we can |
| 2582 | + * deal with displaying RECORD-returning functions in subplan targetlists. |
2575 | 2583 | */ |
2576 | 2584 | staticconstchar* |
2577 | 2585 | get_name_for_var_field(Var*var,intfieldno, |
@@ -2602,7 +2610,6 @@ get_name_for_var_field(Var *var, int fieldno, |
2602 | 2610 | switch (rte->rtekind) |
2603 | 2611 | { |
2604 | 2612 | caseRTE_RELATION: |
2605 | | -caseRTE_SPECIAL: |
2606 | 2613 |
|
2607 | 2614 | /* |
2608 | 2615 | * This case should not occur: a column of a table shouldn't have |
@@ -2663,6 +2670,21 @@ get_name_for_var_field(Var *var, int fieldno, |
2663 | 2670 | * its result columns as RECORD, which is not allowed. |
2664 | 2671 | */ |
2665 | 2672 | break; |
| 2673 | +caseRTE_SPECIAL: |
| 2674 | +/* |
| 2675 | + * This case occurs during EXPLAIN when we are looking at a |
| 2676 | + * deparse context node set up by deparse_context_for_subplan(). |
| 2677 | + * Look into the subplan's target list to get the referenced |
| 2678 | + * expression, and then pass it to get_expr_result_type(). |
| 2679 | + */ |
| 2680 | +if (rte->coldeflist) |
| 2681 | +{ |
| 2682 | +TargetEntry*ste=get_tle_by_resno(rte->coldeflist,attnum); |
| 2683 | + |
| 2684 | +if (ste!=NULL) |
| 2685 | +expr= (Node*)ste->expr; |
| 2686 | +} |
| 2687 | +break; |
2666 | 2688 | } |
2667 | 2689 |
|
2668 | 2690 | /* |
|