GH-44248: [Format] Add TimestampWithOffset canonical extension type#48002
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- Drop JSON encoding recommendation - Inner fields must be non-nullble - Time unit is not a type parameter
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Thanks for this PR @serramatutu -- the basic idea looks good to me
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Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
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Co-authored-by: Felipe Oliveira Carvalho <felipekde@gmail.com>
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After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit b10386e. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. It also includes information about 11 possible false positives for unstable benchmarks that are known to sometimes produce them. |
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# Which issue does this PR close? Implement `arrow.timestamp_with_offset` canonical extension type. # Rationale for this change Be compliant with Arrow spec: apache/arrow#48002 # What changes are included in this PR? This commit adds a new `TimestampWithOffset` extension type. This type represents a timestamp column that stores potentially different timezone offsets per value. The timestamp is stored in UTC alongside the original timezone offset in minutes. # Are these changes tested? Yes. # Are there any user-facing changes? Yes, this is a new canonical extension type.
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# Which issue does this PR close? Implement `arrow.timestamp_with_offset` canonical extension type. # Rationale for this change Be compliant with Arrow spec: apache/arrow#48002 # What changes are included in this PR? This commit adds a new `TimestampWithOffset` extension type. This type represents a timestamp column that stores potentially different timezone offsets per value. The timestamp is stored in UTC alongside the original timezone offset in minutes. # Are these changes tested? Yes. # Are there any user-facing changes? Yes, this is a new canonical extension type.
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Rationale for this change
Closes #44248
Arrow has no built-in canonical way of representing the
TIMESTAMP WITH TIME ZONESQL type, which is present across multiple different database systems. Not having a native way to represent this forces users to either convert to UTC and drop the time zone, which may have correctness implications, or use bespoke workarounds. A newarrow.timestamp_with_offsetextension type would introduce a standard canonical way of representing that information.Rust implementation: apache/arrow-rs#8743
Go implementation: apache/arrow-go#558
[DISCUSS] thread in the mailing list.
What changes are included in this PR?
Proposal and documentation for
arrow.timestamp_with_offsetcanonical extension type.Are these changes tested?
N/A
Are there any user-facing changes?
Yes, this is an extension to the arrow format.