Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19683
The sql in the failed test
`org.apache.spark.sql.hive.execution.HiveUDFSuite.UDTF` looks like:
```sql
SELECT udtf_count2(a) FROM (SELECT 1 AS a FROM src LIMIT 3) t
```
The `unrequiredChildOutput` is `ArrayBuffer(a#1287)` first. But as it is a
literal in fact, the `unrequiredChildOutput` is optimized to `ArrayBuffer(1)`
later.
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