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

On Tue, Jan 03, 2017 at 02:32:36PM -0500, Tom Lane wrote:
> Justin Pryzby <pryzby(at)telsasoft(dot)com> writes:
> >>>> I can cause the error at will on the existing table,
>
> That's good news, at least.
>
> 1. Please trigger it with "\set VERBOSITY verbose" enabled, so we can see
> the exact source location --- there are a couple of instances of that
> text.

ts=# begin; drop view umts_eric_ch_switch_view, eric_umts_rnc_utrancell_view, umts_eric_cell_integrity_view; ALTER TABLE eric_umts_rnc_utrancell_metrics ALTER COLUMN PMSUMPACKETLATENCY_000 TYPE BIGINT USING PMSUMPACKETLATENCY_000::BIGINT;
BEGIN
DROP VIEW
ERROR: 42804: attribute 424 has wrong type
DETAIL: Table has type smallint, but query expects integer.
LOCATION: ExecEvalScalarVar, execQual.c:660

> 2. Even better would be a stack trace for the call to errfinish,
> https://wiki.postgresql.org/wiki/Generating_a_stack_trace_of_a_PostgreSQL_backend

#1 0x00000000006dd39f in exec_simple_query (query_string=0x1fc5fb0 "begin;")
at postgres.c:932
dest = DestRemote
oldcontext = 0x1f3b100
parsetree_list = 0x1fc69f0
save_log_statement_stats = 0 '\000'
was_logged = 0 '\000'
msec_str = "\360:\235\213\377\177\000\000`<\235\213\377\177\000\000\260_\374\001", '\000' <repeats 11 times>
__func__ = "exec_simple_query"

and then

#1 0x00000000006dd39f in exec_simple_query (
query_string=0x1fc5fb0 "ALTER TABLE eric_umts_rnc_utrancell_metrics ALTER COLUMN PMSUMPACKETLATENCY_000 TYPE BIGINT USING PMSUMPACKETLATENCY_000::BIGINT;")
at postgres.c:932
dest = DestRemote
oldcontext = 0x1f3b100
parsetree_list = 0x1fc6fc8
save_log_statement_stats = 0 '\000'
was_logged = 0 '\000'
msec_str = "\360:\235\213\377\177\000\000`<\235\213\377\177\000\000\260_\374\001", '\000' <repeats 11 times>
__func__ = "exec_simple_query"

then

#1 0x00000000005d0e30 in ExecEvalScalarVar (exprstate=<value optimized out>,
econtext=<value optimized out>, isNull=<value optimized out>,
isDone=<value optimized out>) at execQual.c:655
attnum = 424
__func__ = "ExecEvalScalarVar"

> 3. It's pretty hard to see how you'd reach any of these places for an
> ALTER COLUMN TYPE on a simple table. Has the table got rules, triggers,
> default values? Could we see "\d+" output for it?

triggers and defaults, yes.

sect_id | integer | not null
start_time | timestamp with time zone | not null
site_id | integer | not null
interval_seconds | smallint | not null
utrancell | text | not null
nedn | text | not null
rnc_id | integer | not null
device_id | integer | not null
pmcelldowntimeauto | smallint |
pmcelldowntimeman | smallint |
pmchswitchattemptfachura | smallint |
pmchswitchattempturafach | smallint |
...
Triggers:
eric_umts_rnc_utrancell_insert_trigger BEFORE INSERT ON eric_umts_rnc_utrancell_metrics FOR EACH ROW EXECUTE PROCEDURE eric_umts_rnc_utrancell_insert_function()
Number of child tables: 3 (Use \d+ to list them.)

I'll send the rest of \d if you really want but:

ts=# SELECT COUNT(1) FROM pg_attribute WHERE attrelid='eric_umts_rnc_utrancell_metrics'::regclass;
count | 1116

Justin