"David G. Johnston" <david.g.johns...@gmail.com> writes:
> On Tuesday, September 19, 2017, Tom Lane <t...@sss.pgh.pa.us> wrote:
>> I'd be much happier if there were some notational difference
>> between I-want-the-composite-variable-to-absorb-a-composite-column
>> and I-want-the-composite-variable-to-absorb-N-scalar-columns.
> If we change to considering exactly one output column for each target var
> this seems unnecessary.
Breaking backwards compatibility to that extent seems like a nonstarter.
regards, tom lane
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