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WL #12074: Volcano iterator executor base [14/15, zero tables]
Support queries with zero tables, ie. not even a const table.
(These are not allowed by ANSI SQL, but would seem a reasonably
useful extension.) This requires a little bit of coaxing,
since we allow having aggregation on such queries (which is
maybe a less useful extension), and there's no “last table”
to check the end_send function pointer on.
Change-Id: I2cee6424e84c7dec32424c9966293131c07939c2
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