Github user gczsjdy commented on the issue:
https://github.com/apache/spark/pull/16476
@cloud-fan I have checked some other popular RDBMS, such as Oracle,
Microsoft SQL Server, PostgreSQL, DB2, SQLite, neither of them support function
`FIELD`.
In my opinion, Hive has an important place in SQL on Big Data area, and
many Spark SQL users originally use Hive, so maybe it's more reasonable to
follow Hive since other databases currently not support this function.
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