[JingsongLi]

Purpose

Stop automatically setting deletion-vectors.enabled=true and vector.file.format=parquet when creating Python multimodal tables. Both remain available through explicit table options. Update the default-options assertions and documentation, including the deletion-vector requirement for row-level deletes and matched MERGE deletes. Explicitly enable these options in test tables that exercise deletion vectors or dedicated vector files.

Tests

• PyTorch suite: 79 passed, 65 subtests passed.
• Ray vector, batch vector, search results, filter exactness, full-text and result metadata suites: 141 passed.
• Focused multimodal, column enrichment, Lance export, search snapshot, score metadata, batch lookup and global-index regressions passed, including the final partition-scoped index regression.
• Flake8 for changed Python files and git diff --check passed.

Native CI dependency

The latest Native CI run is blocked by an independent zero-width fixed binary upsert bug in paimon-rust, tracked in apache/paimon-rust#1316 and fixed by apache/paimon-rust#1317. All other selected jobs passed.

The rebuilt native wheel passes all 16 zero-width binary upsert cases, including the four CI failures, and all 534 upsert encoding and binary/text regressions. Native CI builds paimon-rust main; rerun it after the dependency fix is merged.

[leaves12138]

LGTM