maropu commented on issue #27309: [SPARK-30598][SQL] Detect equijoins better URL: https://github.com/apache/spark/pull/27309#issuecomment-576967342 This query (and the optimization) is useful for users? Actually, it seems pgsql don't allow it: ``` postgres=# SELECT * FROM t1 FULL OUTER JOIN t2 ON t1.c2 = 2 AND t2.c2 = 2; ERROR: FULL JOIN is only supported with merge-joinable or hash-joinable join conditions ```
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