Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/15432 Oh, strictly, it does not ignore in case of `PostgreSQL`. It unsets. ```sql postgres=# SELECT setseed(0); setseed --------- (1 row) postgres=# SELECT random(); random ------------------- 0.840187716763467 (1 row) postgres=# SELECT random(); random ------------------- 0.394382926635444 (1 row) postgres=# SELECT setseed(null); setseed --------- (1 row) postgres=# SELECT random(); random ------------------- 0.783099223393947 (1 row) postgres=# SELECT random(); random ------------------- 0.798440033104271 (1 row) postgres=# SELECT setseed(0); setseed --------- (1 row) postgres=# SELECT random(); random ------------------- 0.840187716763467 (1 row) postgres=# SELECT random(); random ------------------- 0.394382926635444 (1 row) ```
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