maropu commented on issue #27803: [SPARK-31049][SQL] Support nested adjacent generators, e.g., explode(explode(v)) URL: https://github.com/apache/spark/pull/27803#issuecomment-596365067 Thanks for your question, @dongjoon-hyun. Yea, actually no. But, I saw some usecases on the web where users expand nested arrays by a `unnest` function in potgresql and google big query; ``` postgres=# select unnest(ARRAY[ARRAY[1,2],ARRAY[3,4]]); unnest -------- 1 2 3 4 (4 rows) ``` Based on this, IMO extending the existing `explode` for nested arrays seems helpful for users. FYI: we already have the [jira](https://issues.apache.org/jira/browse/SPARK-28382) for implementing the unnest function, but we've closed the jira because of our policy as you know.
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