CONCAT function

Hello,

The pg_catalog.concat() is defined as STABLE function.

As per my understanding a STABLE function cannot modify the database and is
guaranteed to return the same results given the same arguments for all rows
within a single statement.
Example:
current_timestamp family of functions qualify as stable, since their values
do not change within a transaction.

An IMMUTABLE function cannot modify the database and is guaranteed to return
the same results given the same arguments forever.

why was STABLE preferred for concat() over IMMUTABLE?




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Regards,
Vinayak,

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