FormulaCellCacheEntry: Optimize ChangeConsumingCells method #939
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Using a HashSet to reduce the time complexity of the
ChangeConsumingCellsmethod.Similar to what is done in the original POI implementation:
https://github.com/apache/poi/blob/43b0529a67c813ae1ebd0812a7c8d87332704d71/poi/src/main/java/org/apache/poi/ss/formula/FormulaCellCacheEntry.java#L93
This change greatly improves the performance of formula value caching when the worksheet contains a lot of cells.