fix: handle empty index in _pd_index_to_array_value #2356
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- Replaced Python-based row explosion with optimized PyArrow computation for nested arrays. - Cleaned up comments in to strictly adhere to Google Python Style Guide (focused on 'why', removed redundant 'what'). - Renamed variable to for clarity. - Verified changes with Python unit tests and JavaScript frontend tests.
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THIS PR is not ready to review. I need this pr to test it on colab notebooks.
This PR fixes a crash (IndexError: tuple index out of range) that occurred when performing unpivot operations, such as melt, stack, or summarize, on empty or filtered DataFrames. This issue was frequently encountered by users in notebook workflows, particularly when using SQL Cells and Viz Cells on result sets with zero rows.
Fixes #<452681068> 🦕