tps/transaction_range.pgsql

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SELECT
t.srce
,(ae.e::text[])[1] unq_constr
,MIN(rec #>> ae.e::text[]) min_text
,COUNT(*) cnt
,MAX(rec #>> ae.e::text[]) max_text
FROM
tps.trans t
INNER JOIN tps.srce s ON
s.srce = t.srce
LEFT JOIN LATERAL JSONB_ARRAY_ELEMENTS_TEXT(defn->'unique_constraint'->'fields') WITH ORDINALITY ae(e, rn) ON TRUE
GROUP BY
t.srce
,(ae.e::text[])[1]