fix: Make fewer copies when building a string array #5503
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"In the last few months a performance degradation has crept in when processing flux. One possible cause was the changes that were made to the way string arrays were built, which always built a full array even if it would ultimately not be needed. This change ensures that a full arrow array is only created when necessary.
btasker
approved these changes
Aug 13, 2024
array/builder.go
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| return | ||
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| b.makeBuilder(buf) | ||
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| // Append appends a string to the array being built. The input string | ||
| // will always be copied. |
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Minor point: the second half of this comment was true prior to this change, but now isn't
crepererum
approved these changes
Aug 13, 2024
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Change the StringBuilder to only create an arrow builder when it becomes necessary. Whist the StringBuilder has only a single distinct value it will just record how long the array is. Creating an arrow.StringBuilder when a second distinct value is added.
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experimental/docs/Spec.mdhas been updatedDear Reviewer(s) 👋, you are responsible (among others) for ensuring the completeness and quality of the above before approval.