[PR] [python] Verify native REST Blob view dependency reads [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi opened a new pull request, #10471:
URL: https://github.com/apache/paimon/pull/10471

   ### Purpose
   
   Verify the existing PyPaimon REST BLOB view capability through Native reads and MERGE table sources, using Java's dependency context and upstream FileIO semantics.
   
   Depends on https://github.com/apache/paimon-rust/pull/1085. This PR is draft until that core fix is merged. Native CI continues to build paimon-rust `main`; no fork/ref pin or compatibility fallback is added.
   
   The original native extension fails with 403 when the REST service requires `X-Paimon-Read-Via`, while the classic Python reader succeeds. These tests keep the existing Python capability and require the native implementation to produce the same result.
   
   - Direct/nested view reads retain the outermost table identity, NULL values, and descriptor output.
   - Native MERGE consumes a view table source without Python materialization.
   - A signed S3 fixture rejects the wrong table's data token and forces upstream token refresh without sleeps.
   - Multiple BLOB fields share one upstream metadata/snapshot scan; field IDs remain correct after dropping an ordinary column.
   - Branch identifiers, explicitly supplied outer Read-Via, and denied dependencies retain their semantics.
   - Native cases reject reader/source fallback rather than silently passing through Python.
   
   ### Tests
   
   Built the local extension with the Rust core fix and ran nine suites with `PYPAIMON_TEST_NATIVE_PLAN`, `READ`, `WRITE`, `UPDATE`, and `COMMIT` all enabled: **983 passed**. Counters confirmed native plans (1268), reads (1387), writes (686), commits (336), and every update family.
   
   The final Blob-view selection was also independently verified: **19 passed**. Flake8, Python 3.6 syntax parsing, and `git diff --check` passed.
   


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Re: [PR] [python] Verify native REST Blob view dependency reads [paimon]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #10471:
URL: https://github.com/apache/paimon/pull/10471


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