feat: support nanosecond date_part#20674
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alamb merged 4 commits intoapache:mainfrom Mar 4, 2026
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Support using 'nanosecond' as a part in the date_part function. If nanosecond is requested then the date_part will return the seconds, and smaller units, scaled to nanoseconds. This is consistent with the behaviour of 'millisecond' and 'microsecond'. In order to accomodate the required range of results, a request for 'nanosecond' will return a 64-bit integer, rather than a 32-bit integer as is returned for everything else (except 'epoch').
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Mar 3, 2026
| matches!(part.to_lowercase().as_str(), "epoch") | ||
| } | ||
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| fn is_nanosecond(part: &str) -> bool { |
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Is it worth adding a note that this is required due to the fact that nanosecond needs a different return type
| let subsecs = as_int32_array(subsecs.as_ref())?; | ||
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| // Special case where there are no nulls. | ||
| if subsecs.null_count() == 0 { |
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Would it be safer to also check sec.nulls too? It does feel like any nulls in subsecs would also be in secs and vica versa
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I re-reviewed the code and since they both come from calling arrow date_part I don't think this is necessary
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| query error DataFusion error: This feature is not implemented: Date part Nanosecond not supported | ||
| query I |
| .zip(subsecs) | ||
| .map(|(secs, subsecs)| { | ||
| secs.map(|secs| { | ||
| let subsecs = subsecs.unwrap_or(0); |
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I didn't see any test coverage of nulls 🤔 -- maybe we can add some
Contributor
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I took the liberty of adding some comments and a few more tests |
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Support using 'nanosecond' as a part in the date_part function. If nanosecond is requested then the date_part will return the seconds, and smaller units, scaled to nanoseconds. This is consistent with the behaviour of 'millisecond' and 'microsecond'. In order to accomodate the required range of results, a request for 'nanosecond' will return a 64-bit integer, rather than a 32-bit integer as is returned for everything else (except 'epoch').
Which issue does this PR close?
Rationale for this change
The feature is a) useful & b) documented
What changes are included in this PR?
Are these changes tested?
Yes, some added and modified SLT tests.
Are there any user-facing changes?
Only in as much as the implementation now matches the documentation (for this specific case).