maropu commented on issue #26477: [SPARK-29776][SQL] rpad should return NULL when padstring parameter is empty URL: https://github.com/apache/spark/pull/26477#issuecomment-568837508 Can you update the description and the examples for `StringRPad`, too? https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala#L1244-L1259
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