[PERF] import xlsx: avoid reading all cells multiple times during table_conversion #6057
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Previously, the content of each cell was inspected multiple times, once per table, leading to significant performance overhead. In this commit, the inspection process is optimized to traverse the cells only once.
A data structure now stores only the cells that need to be updated, improving both efficiency and calculation time.
This optimization results in a 10% reduction in total import time.
Task: 4699860