Filter manifest entries on pyiceberg-core Arrow output in plan_files

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python
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Read _open_manifest in table/__init__.py and the referenced issues #3658, #4007, and apache/iceberg-rust#3649 to understand the current filtering and the dependency on Rust-side decisions. Then check how the optional pyiceberg-core reader exposes Arrow columns and how the Cython reader remains the fallback. Done means filtering Arrow output before constructing DataFile objects, with the existing fallback preserved.

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描述

Feature Request / Improvement

_open_manifest (table/__init__.py#L2321-L2334) filters each manifest entry with Python partition and metrics evaluators while decoding (#3658), but every entry still becomes a DataFile before it is filtered. #4007 shows that building those objects costs about as much as the whole Cython decode. To beat Cython, filtering has to happen on the Arrow columns from pyiceberg-core, so that only the matching entries become Python objects.

This needs apache/iceberg-rust#3649, which settles whether the filtering runs vectorized in PyIceberg or in Rust. pyiceberg-core is an optional extra, so the Cython reader stays as the fallback.

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