"David G. Johnston" <david.g.johns...@gmail.com> writes:
> On Wednesday, August 23, 2017, Kevin Golding <kgold...@axessgroup.com.au>
> wrote:
>> Presumably the length validation is being done before the trigger is run.
>> Is there some way this could be changed so the trigger happens first?
> The input tuple passed into the trigger is a valid record of the same type
> as the table to which it is attached. This means that while table
> constraints are not enforced all column values must already be valid for
> the defined column type.
Right, that's why this isn't likely to change. You could replace the
datatype-related limit with a CHECK constraint, and then it'd be possible
for a BEFORE trigger to modify the value to make it compliant before the
constraint is checked.
regards, tom lane
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