Re: ALTER TABLE .. ALTER COLUMN .. ERROR: attribute .. has wrong type

Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> (gdb) bt
> #0 errfinish (dummy=0) at elog.c:414
> #1 0x00000000005d0e30 in ExecEvalScalarVar (exprstate=<value optimized out>, econtext=<value optimized out>, isNull=<value optimized out>, isDone=<value optimized out>) at execQual.c:655
> #2 0x00000000005d0c3c in ExecMakeFunctionResultNoSets (fcache=0x21f18a0, econtext=0x2199e80, isNull=0x21e90ee "", isDone=<value optimized out>) at execQual.c:2015
> #3 0x000000000059d5ce in ATRewriteTable (tab=<value optimized out>, OIDNewHeap=<value optimized out>, lockmode=<value optimized out>) at tablecmds.c:4152
> #4 0x00000000005a92fc in ATRewriteTables (parsetree=0x1f63b20, rel=<value optimized out>, cmds=<value optimized out>, recurse=<value optimized out>, lockmode=<value optimized out>) at tablecmds.c:3858
> #5 ATController (parsetree=0x1f63b20, rel=<value optimized out>, cmds=<value optimized out>, recurse=<value optimized out>, lockmode=<value optimized out>) at tablecmds.c:3104
> #6 0x00000000006e25e6 in ProcessUtilitySlow (parsetree=0x1fc6f78, queryString=0x1fc5fb0 "ALTER TABLE eric_umts_rnc_utrancell_metrics ALTER COLUMN PMSUMPACKETLATENCY_000 TYPE BIGINT USING PMSUMPACKETLATENCY_000::BIGINT;",
> context=PROCESS_UTILITY_TOPLEVEL, params=0x0, dest=<value optimized out>, completionTag=0x7fff8b9d3a90 "") at utility.c:1085

Okay, so it's clearly processing the USING expression and not something
else, which is weird because that should've just been parsed against the
existing table column; how could that Var contain the wrong type?

I'm wondering if this represents some sort of out-of-sync condition
between the table and its child tables. We can't actually tell from
this trace which table is being processed. Could you try, from this
breakpoint,

f 3
p oldrel->rd_rel->relname

regards, tom lane