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https://issues.apache.org/jira/browse/ARROW-110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15809840#comment-15809840
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Wes McKinney commented on ARROW-110:
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for arrays with 128K elements and less it uses 1.5; we could potentially
implement a similar strategy, once we write enough benchmarks to measure an
impact on making lots of medium-ish arrays
https://github.com/facebook/folly/blob/master/folly/FBVector.h#L1141
> [C++] Decide on optimal growth factor when appending to buffers/arrays
> ----------------------------------------------------------------------
>
> Key: ARROW-110
> URL: https://issues.apache.org/jira/browse/ARROW-110
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Micah Kornfield
>
> There is some evidence that powers of 2 might not be optimal (the facebook
> folly library suggests this in there explanation of why they have there own
> vector type). They use 1.5 (as do other implementations that don't use two).
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