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Document Calendar ORC metadata limitation #26874

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Document Calendar ORC metadata limitation #26874

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0d7cfd3
Add a known limitation of ORC reader to docs.
marcinsbd Oct 8, 2025
904f303
Add a known limitation of ORC reader to docs.
marcinsbd Oct 13, 2025
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8 changes: 8 additions & 0 deletions docs/src/main/sphinx/object-storage/file-formats.md
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Expand Up @@ -31,6 +31,14 @@ with ORC files performed by supported object storage connectors:
[](file-compression) is automatically performed and some details can be
configured.

## ORC support limitations

[Trino ignores Calendar entry in ORC file metadata.](https://github.com/trinodb/trino/issues/26865)
As a result Trino always treats dates and timestamps as values written using
proleptic Gregorian calendar. This causes incorrect values read when reading
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Suggested change
proleptic Gregorian calendar. This causes incorrect values read when reading
Gregorian calendar. This causes incorrect values when reading

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  • proleptic is an important word, we should keep it

  • "This causes incorrect values when reading" reads as missing something.
    Incorrect values where? does the file gets broken, changed or malformed when we try to read it? or only the values reconstructed in computer memory are wrong?

date/time values before Oct 15, 1582 that were written using hybrid
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date/time values before Oct 15, 1582 that were written using hybrid
values before Oct 15, 1582 that were written using hybrid

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we can remove "date/time", but then we need to indicate which types does this apply to.
@mosabua how would you want to indicate this?

Julian-Gregorian calendar.

(parquet-format-configuration)=
## Parquet format configuration properties

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