All of the threading on this email seems to have been broken, +1 (non binding)
I would love to move forward with this. From our meeting this morning it seems we at least know the first step for the implementers. Add a flag to allow this encoding to be used with the knowledge that supporting it will not be required until a Parquet vNext release. On Mon, Jul 20, 2026 at 6:46 AM PRATEEK GAUR <[email protected]> wrote: > Hello everyone, > > This is a vote to add ALP (Adaptive Lossless floating-Point) as a new > encoding in Parquet, as discussed in the design document and proposal pull > request. > > We've had discussions on this in the design document ( > https://docs.google.com/document/d/1xz2cudDpN2Y1ImFcTXh15s-3fPtD_aWt/edit) > and the proposal pull request ( > https://github.com/apache/parquet-format/pull/557), as well as the > discussion thread ( > https://lists.apache.org/thread/tjtln1mmjqfoql1ls2dw9xpdk91r1909). > > Reference implementations are available in > > - parquet-java (https://github.com/apache/parquet-java/pull/3397) > - Arrow C++ (https://github.com/apache/arrow/pull/48345) > - Arrow Go (https://github.com/apache/arrow-go/pull/704). > - Test artifacts : https://github.com/apache/parquet-testing/pull/100 > > Cross-language compatibility is verified: the Arrow C++ decoder reads > Java-written data bit, covering V1 and V2 pages, multiple vector sizes, and > several real datasets — zero mismatches. > > This vote will be open for at least 72 hours: > > [ ] +1: Add ALP encoding to the Parquet spec > [ ] +0: Not going to block, but prefer . . . > [ ] -1: Do not add ALP to Parquet > > Thank you for all the feedback, input, and involvement in developing this > new encoding! > > Thanks, > Prateek Gaur >
