Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> Now I understand to interpretation. But there is little bit difficult
> to understand to error message. Can be message enhanced to show a
> complete expression?
It does already:
regression=# select foo();
ERROR: column "label" does not exist
LINE 2: <<label>>
^
QUERY: SELECT 10
<<label>>
CONTEXT: PL/pgSQL function "foo" line 3 at FOR with integer loop variable
The "query" is SELECT followed by whatever plpgsql thought the
expression was.
regards, tom lane