srowen commented on issue #25678: [SPARK-28973][SQL] Add `TimeType` and support 
`java.time.LocalTime` as its external type.
   It looks pretty thorough to me. I don't see a problem with supporting 
`LocalTime` as microseconds since midnight. 
   You're right that the more important question is whether introducing a 
catalyst `TimeType` causes any subtler problems. For example, what if I write 
this type as Parquet? I get a long type out? are there any related types in 
Parquet or otherwise that we need to consider the behavior of, whether it's 
consistent with those? I don't know, those are just the questions I'd have to 
decide if there is any issue here.

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