doc: mention GROUP BY columns can reference target col numbers
Bruce Momjian <bruce@momjian.us>
doc: mention GROUP BY columns can reference target col numbers Reported-by: hape <postgres-hape@gmx.de> Discussion: https://postgr.es/m/168871536004.379168.9352636188330923805@wrigleys.postgresql.org Backpatch-through: 11
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