> I am trying to create an expression which
> - always yield true if the incomming array is NULL
> - yields true if a given value is in the array, otherwise yields false
>
> I thought this should work:
> Select 'target'=ANY(COALESCE('{indata1, indata2}','{target}'))
>
> but I get an ERROR: op ANY/ALL (array) requires array on right side
> Can somebody tell me what I am doing wrong and how to do this right?
Read up on array input syntax
(http://www.postgresql.org/docs/current/static/arrays.html). What you
are giving as input to your coalesce above are two strings, not two
arrays. Try this:
select 'target' = any(coalesce('{"indata1","target"}'::text[],
'{"target"}'::text[]));
I personally find the ARRAY syntax more intuitive:
select 'target' = any(coalesce(array['indata1','indata2'],
array['target']));
This will work as i think you expect it to. Note that array behavior
with respect to nulls changed with 8.2 so whether "incomming array is
NULL" will differ depend on your version.
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