Thanks for the suggestion, Used || , actually I was reluctant to use this because my columns could have contained null
values.But that I have handled using COALESCE.
-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Thursday, October 13, 2016 7:37 PM
To: Jaisingkar, Piyush
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Passing of where clause to remote table in FDW
"Jaisingkar, Piyush" <Piyush.Jaisingkar@nttdata.com> writes:
> While using fdw I am trying to get and filtered data from a foreign table. Filtering using a regex in where clause as
follows:
> EXPLAIN ANALYZE VERBOSE SELECT CAF1.uprn
> FROM XYZ as CAF1
> WHERE
>
> (regexp_replace(upper(concat(CAF1.SUB_BUILDING_NAME,CAF1.BUILDING_NAME
> ,CAF1.BUILDING_NUMBER,CAF1.STREET_DESCRIPTION , CAF1.TOWN_NAME)),
> '[^a-zA-Z0-9]','') = '84WELLINGTONROADEXETER');
concat() is not immutable (it's only stable) so it can't be sent for remote execution. Use the || operator instead.
regards, tom lane
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