Fix explode to preserve datetime unit in Series and DataFrame; update… #61612
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This PR fixes an issue where the explode method in both Series and DataFrame does not preserve the datetime unit information (such as milliseconds or microseconds) of DatetimeIndex or datetime-like data. Previously, exploding a datetime-like Series or DataFrame column would convert timestamps to nanosecond resolution, losing the original unit precision.
The fix ensures that after exploding, the resulting Series or DataFrame retains the original datetime unit dtype, maintaining consistency and avoiding unwanted dtype changes.
Additionally, relevant tests have been updated and extended to verify that the datetime unit is preserved through explode operations in both single- and multi-column cases.
explode()converts timestamps at millisecond resolution in DatetimeIndex to nanosecond resolution #61610doc/source/whatsnew/v3.0.0.rstfile if fixing a bug or adding a new feature.