Add support for writing deletion vectors in Delta Lake#22102
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ebyhr
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| deletedRows.or(deletion.rowsDeletedByDelete()); | ||
| deletedRows.or(deletion.rowsDeletedByUpdate()); | ||
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| TrinoInputFile inputFile = fileSystem.newInputFile(Location.of(path.toStringUtf8())); |
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Do we know size of deletion vector in advance from io.trino.plugin.deltalake.transactionlog.DeletionVectorEntry#sizeInBytes or any other metadata ?
If we do, then using it in newInputFile would probably save a FS call.
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This inputFile is a Parquet file, not deletion vector. I think that's possible, but it requires some refactoring. Let me handle in a follow-up.
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When we write a new deletion vector, is it mandatory as per the spec that it should be a union of all deleted/updated rows so far, or is that just how we've implemented it ?
Is cleanup of old deletion vectors something already handled by some optimize/vaccum procedure in Trino ?
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It's mandatory for compatiblity with Delta Lake. Otherwise, they return the wrong results if I remember correctly.
The cleanup should be handled in #22809
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Addressed comments. |
raunaqmorarka
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| RoaringBitmapArray deletedRows = loadDeletionVector(Location.of(path.toStringUtf8())); | ||
| deletedRows.or(deletion.rowsDeletedByDelete()); | ||
| deletedRows.or(deletion.rowsDeletedByUpdate()); |
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There was a discussion with @findepi about whether If the amount of rows deleted from file depasses a certain quota, we should consider to proactively rewrite the file.
Is there a potential follow-up here?
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It's a potential follow-up task. I don't expect we will handle it shortly though.
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Description
Fixes #17063
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(x) Release notes are required, with the following suggested text: