apache / apache/iceberg-python

[Feat] Support Merge-on-Read mode for Deletes

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Description

### Feature Request / Improvement

Similar to Spark, we would like to implement Merge-on-Read mode of deleting, by creating delete files that encode position and equality delete markers that can be applied within a given partition.

https://iceberg.apache.org/spec/?h=delete+files#row-level-deletes

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