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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Performance: Presize JsonStringArrayList vector results","articleBody":"### Describe the enhancement requested\n\n`FixedSizeListVector#getObject` already performs this optimization; however, `ListVector`, `ListViewVector`, `LargeListVector`, and `LargeListViewVector` do not yet presize the result `JsonStringArrayList` requiring dynamic reallocations as elements are converted \u0026 added. This can become a scalability bottleneck when using these types.\n\nExample of `FixedSizeListVector` presizing: \n\nhttps://github.com/apache/arrow-java/blob/a6245ab87c782e2b873526acbd876cdf96d1f0ee/vector/src/main/java/org/apache/arrow/vector/complex/FixedSizeListVector.java#L476-L482\n\nExample `ListVector` not presizing:\n\nhttps://github.com/apache/arrow-java/blob/a6245ab87c782e2b873526acbd876cdf96d1f0ee/vector/src/main/java/org/apache/arrow/vector/complex/ListVector.java#L718-L727","author":{"url":"https://github.com/schlosna","@type":"Person","name":"schlosna"},"datePublished":"2025-08-11T17:36:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/816/arrow-java/issues/816"}