Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17693
I like the idea but I am not sure of `DROPMALFORMED` mode though. If we use
an expression with the mode enabled, whole record (not only the column but all
columns) will be dropped in some json expressions, probably not a generator
expressions (did I understand correctly?).
I think we don't explicitly support parse modes in both
`from_json`/`to_json` -
https://github.com/apache/spark/blob/465818389aab1217c9de5c685cfaee3ffaec91bb/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L551
It sets `FAILFAST` but resembles `PERMISSIVE` mode up to my knowledge.
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