jackylee-ch opened a new pull request, #9103:
URL: https://github.com/apache/paimon/pull/9103
### Purpose
`MosaicRowTypeVisitor` accepted every timestamp precision, but precision 0
maps to Arrow
`TimeUnit.SECOND` (`ArrowFieldTypeConversion#getTimeUnit`), which the mosaic
native writer
rejects. `CREATE TABLE t (ts TIMESTAMP(0)) WITH ('file.format' = 'mosaic')`
succeeded and the
first `INSERT` failed with `RuntimeException: failed to open writer` and a
null cause — the
real reason ("unsupported Timestamp unit: Second") only reached stderr from
native code.
MySQL `DATETIME`/`TIMESTAMP` without an explicit length maps to
`TIMESTAMP(0)`
(`MySqlTypeUtils`), so a CDC-synced table hits this by default.
Reject precision 0 at schema validation, as `LanceFileFormat` does for
`LOCAL_ZONED_TIMESTAMP`.
### Tests
`MosaicFileFormatTest` — added rejecting cases for `TIMESTAMP(0)` and
`TIMESTAMP_LTZ(0)`, plus
a positive case over precisions 1-9. 12/12 pass; both negatives fail without
the fix.
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