gatorsmile commented on issue #21055: [SPARK-23693][SQL] Functions to generate UUIDs URL: https://github.com/apache/spark/pull/21055#issuecomment-449610602 @tashoyan Based on my understanding, you want to get the unique IDs after the self union. ``` val df1 = spark.range(1, 10).selectExpr("id", "uuid()") df1.union(df1).show() df1.union(df1).explain(true) ``` To solve your issue, you just need to add a custom rule to update the initial seed instead of changing the way we implement UUID.
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