Github user davies commented on the issue:
https://github.com/apache/spark/pull/15332
Paruqet support both millisecond and microseconds:
```
TIMESTAMP_MILLIS
TIMESTAMP_MILLIS is used for a combined logical date and time type, with
millisecond precision. It must annotate an int64 that stores the number of
milliseconds from the Unix epoch, 00:00:00.000 on 1 January 1970, UTC.
TIMESTAMP_MICROS
TIMESTAMP_MICROS is used for a combined logical date and time type with
microsecond precision. It must annotate an int64 that stores the number of
microseconds from the Unix epoch, 00:00:00.000000 on 1 January 1970, UTC.
```
We should be able to read both of them, but write it as TIMESTAMP_MICROS by
default?
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