Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/15432 FWIW, the cases below are fine in MySQL: ```sql mysql> SELECT RAND(CAST(2 AS UNSIGNED)); +---------------------------+ | RAND(CAST(2 AS UNSIGNED)) | +---------------------------+ | 0.6555866465490187 | +---------------------------+ 1 row in set (0.00 sec) mysql> SELECT RAND(CAST(NULL AS UNSIGNED)); +------------------------------+ | RAND(CAST(NULL AS UNSIGNED)) | +------------------------------+ | 0.15522042769493574 | +------------------------------+ 1 row in set (0.00 sec) ```
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