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Error: column "host" does not exist

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Hello,

I am working with 8.1.4 pgsql as my database backend. I have a function written in plpgsql language, that queries a particular table as below,

select host from table_host where ip_address = ip_array[i] and port = port_array[i];

The query is running in a for loop. I see ip_array and port_array getting populated with correct values during the execution.
The error I see is,

ERROR:  column "host" does not exist
CONTEXT:  SQL statement "SELECT host"
       PL/pgSQL function "sp_get_ip_data" line 286 at raise

throu psql, I can select the table_host fine.
column "host" is a primary key here.

I dont understand why I see the "column does not exist" error; any idea ?

cheers
Mayuresh


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