I think that clearly it is getting "pg_statistic" from the pg_catalog schema and feeding it to the query. So "tatistic" gets extracted, being the last 8 characters. And then "tati" is fed to the YYYY part of the to_date function. But I already specify the table_schema to be the one that I want. So those internal pg_* views shouldn't even show up in the query.
I'm posting this question to pgsql-general. Hopefully someone can share some insights with me.
I have a bunch of tables in the database and in a separate schema. The tables' names are in this format:
???_???_???_YYYYMMDD
where the last 8 characters is a date.
When I query either the information_schema.tables or pg_tables extracting the last 8 characters out and converting it to a date, it works:
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah from information_schema.tables where table_schema = '????' and table_catalog = '????';
But as soon as I reference it in the where clause, it gives a weird error:
select table_name, to_date(right(table_name, 8), 'YYYYMMDD') blah from information_schema.tables where table_schema = '????' and table_catalog = '????' and to_date(right(table_name, 8), 'YYYYMMDD') is not null;
ERROR: invalid value "tati" for "YYYY" DETAIL: Value must be an integer.
It seems like some strange values were passed into the to_date function, but I'm seeing that the rightmost 8 characters of all the table names are dates. So only date strings are passed to the to_date function. Absolutely nothing containing the string "tati" is passed to the to_date function. What is going on? Is that a bug?