=?utf-8?q?PG_Doc_comments_form?= <nore...@postgresql.org> writes:
> https://www.postgresql.org/docs/current/queries-table-expressions.html#QUERIES-LATERAL
>> The resulting row(s) are joined as usual with the rows they were computed
>> from.
> Here is not so clear what 'joined as usual' mean.
Why not?
> Probably DOC should explicitly say that if LATERAL function return empty set
> then current row is excluded from result set
That would be wrong for "LEFT JOIN LATERAL ...", so it does not seem
like an improvement.
regards, tom lane
