Hi hackers,
While playing with the Merge command, I get an unexpected error. I've searched the mailing list, but couldn't find any reference to this, so decided to send an e-mail.
CREATE TABLE source (id integer, z int);
CREATE TABLE target (id integer, z int);
MERGE INTO public.target sda USING ((SELECT
source.id, source.z, 12 AS rnd FROM public.source source) sdn FULL JOIN public.source sdn2 ON ((
sdn.id OPERATOR(pg_catalog.=)
sdn2.id))) ON (
sda.id OPERATOR(pg_catalog.=)
sdn.id) WHEN NOT MATCHED THEN INSERT (id, z) VALUES (
sdn.id, sdn.rnd);
ERROR: PlaceHolderVar found where not expected
Here is the backtrace:
```
thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 2.1
* frame #0: 0x000000010d60f0df postgres`errstart(elevel=21, domain=0x0000000000000000) at elog.c:453:6 [opt]
frame #1: 0x000000010d6d7e7e postgres`pull_var_clause_walker.cold.7 at var.c:703:4 [opt]
frame #2: 0x000000010d415dae postgres`pull_var_clause_walker(node=<unavailable>, context=0x00007ff7b2dcb7d0) at var.c:703:4 [opt]
frame #3: 0x000000010d3782a5 postgres`expression_tree_walker_impl(node=0x00007ff18503a7c0, walker=<unavailable>, context=<unavailable>) at nodeFuncs.c:2206:9 [opt]
frame #4: 0x000000010d415dfe postgres`pull_var_clause_walker(node=<unavailable>, context=<unavailable>) at var.c:705:9 [opt] [artificial]
frame #5: 0x000000010d415cfc postgres`pull_var_clause(node=<unavailable>, flags=0) at var.c:622:2 [opt]
frame #6: 0x000000010d3fac81 postgres`preprocess_targetlist(root=0x00007ff185037a28) at preptlist.c:165:11 [opt]
frame #7: 0x000000010d3e6941 postgres`grouping_planner(root=<unavailable>, tuple_fraction=<unavailable>) at planner.c:1419:3 [opt]
frame #8: 0x000000010d3e5678 postgres`subquery_planner(glob=<unavailable>, parse=<unavailable>, parent_root=<unavailable>, hasRecursion=<unavailable>, tuple_fraction=0) at planner.c:1065:2 [opt]
frame #9: 0x000000010d3e4277 postgres`standard_planner(parse=0x00007ff185011668, query_string=<unavailable>, cursorOptions=2048, boundParams=0x0000000000000000) at planner.c:411:9 [opt]
```
Thanks,
Onder KALACI