feat: expose timestamp nanos as Arrow timestamp(ns)#21
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Problem
Mosaic exposes TIMESTAMP precision > 6 as a legacy Arrow Struct (
millis,nanos_of_milli) instead of standard Arrow timestamp(ns). This leaks the internal 12-byte storage representation into the Arrow API and loses timezone metadata for TIMESTAMP_LTZ precision > 6.Fix
Keep the Mosaic file format unchanged, but expose high-precision timestamps through standard Arrow timestamp(ns):
Timestamp(Nanosecond, timezone).TimestampNanosecondArrayusing the existingmillis + nanos_of_millistorage encoding.Precision 7/8 is normalized to Arrow timestamp(ns), since Arrow does not preserve decimal timestamp precision separately.