Am 13.04.19 um 11:22 schrieb Nithin Johnson:
>
> We are seeing this intermittent problem after we upgrade (using
> pg_upgrade) from postgres 9.3.12 to 9.6.12
>
> Querying few of the rows in the table using a TEXT field is failing.
>
sounds like a corrupt index, can you show us the complete error message
and the table definition?
Regards, Andreas
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