Re: pgsql: Add basic JSON_TABLE() functionality

I wrote:
> We need to either nuke that ecpg warning entirely, or find a more
> robust way of detecting whether the gram.y complaint is conditional.
> I'll put a brown paper bag on my head before suggesting that maybe
> we could pay attention to how far the errcode is indented. Perhaps
> a slightly nicer way is to assume it's conditional if any earlier
> line in the rule starts with "if".

The latter seems considerably safer, so I modified parse.pl along
those lines. Eyeball comparison of gram.y with preproc.y verifies
that now ecpg will emit the warning only in rules where the backend
unconditionally reports FEATURE_NOT_SUPPORTED.

I suppose this needs to be back-patched.

regards, tom lane