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Posted to issues@parquet.apache.org by "alamb (via GitHub)" <gi...@apache.org> on 2026/08/01 07:33:39 UTC
[PR] [GH-533] Mark ALP as in Preview [parquet-format]
alamb opened a new pull request, #604:
URL: https://github.com/apache/parquet-format/pull/604
- related to https://github.com/apache/parquet-format/issues/533
### Rationale for this change
We recently approved and merged the new ALP encoding into parquet-format
- https://github.com/apache/parquet-format/issues/533
However, as @divjotarora points out on the mailing list
- https://lists.apache.org/thread/sb4hq0fw19mo8ssov8v87z5jc738qnfd
We do not yet have a good way to communicate downstream in the ecosystem how widely supported it is, and when writers could feel safe enabling ALP encoding
Thus I think we should communicate this more clearly
### What changes are included in this PR?
1. Add an annotation to ALP saying it is in "preview"
2. Define inline what "preview" means
**Note 1**: There is a [different ongoing discussion](https://lists.apache.org/thread/qlf8lg90gqq41lllyy9mk2f0skqvftqj) to formalize the notion of "preview" and versioning in Parquet. If this is approved / agreed, I think we would move the definition of preview elsewhere
**Note 2**: @divjotarora I think has proposed an alternative of reverting the ALP encoding from parquet-format until we have finalized the above versioning discussion.
### Do these changes have PoC implementations?
No
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Re: [PR] [GH-533] Mark ALP as in Preview [parquet-format]
Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb merged PR #604:
URL: https://github.com/apache/parquet-format/pull/604
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Re: [PR] [GH-533] Mark ALP as in Preview [parquet-format]
Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb commented on PR #604:
URL: https://github.com/apache/parquet-format/pull/604#issuecomment-5327516906
Thank you everyone for your comments
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