NikhilS <[EMAIL PROTECTED]> writes:
> To allow both of the above to hold, I think the subselect will have to be
> treated like a EXPR_SUBLINK subquery. I was wondering if we have a similar
> mechanism for plain selects/subselects to check and restrict their output to
> a single row.
No. Offhand I think you'd either need to relax EXPR_SUBLINK to allow
multiple output columns, or invent a ROW_SUBLINK SubLinkType that is
just like EXPR_SUBLINK except for allowing multiple output columns.
The latter would probably be less likely to break other things...
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
