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Aleatory exception



Hi there,

I have a custom function where I execute a dynamic statement. I trap the 
exceptions, and sometimes I got the following error data:
            SQLSTATE = 22P02, SQLERRM = invalid input syntax for integer: 
"NULL::int4"

For instance I got this for the following statement string:

Please explain what could be the reason ?

TIA,
Sabin 





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