[PR] fix: preserve empty projection in read_table [paimon-mosaic]

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

QuakeWang opened a new pull request, #25:
URL: https://github.com/apache/paimon-mosaic/pull/25

   ## Problem
   
   `read_table(..., columns=[])` currently skips projection because the Python wrapper checks `if columns:`. This makes an explicit empty projection behave the same as `columns=None`, so the convenience API returns all columns instead of a zero-column table with the row count preserved.
   
   ## Fix
   
   Change the wrapper to call `reader.project(columns)` whenever `columns is not None`, preserving the existing three-state projection semantics:
   
   - `None`: read all columns
   - non-empty list: read selected columns
   - empty list: read zero columns and preserve row count
   
   Add a regression test for `read_table(..., columns=[])`.


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Re: [PR] fix: preserve empty projection in read_table [paimon-mosaic]

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

JingsongLi merged PR #25:
URL: https://github.com/apache/paimon-mosaic/pull/25


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