wjones127 opened a new issue, #4897: URL: https://github.com/apache/arrow-rs/issues/4897
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** Right now, concat only pre-allocates for string, binary, dictionary and primitive arrays (IIUC): https://github.com/apache/arrow-rs/blob/208da03979b2903c3182c20ef382b2895756380a/arrow-select/src/concat.rs#L129-L139 We use `FixedSizeList<{FloatType}>` as a storage type for tensor arrays, and not pre-allocating can get very expensive in plans. https://github.com/lancedb/lance/issues/1360 **Describe the solution you'd like** Should provide capacities for fixed size list array. We likely need to add an entry to this enum: https://github.com/apache/arrow-rs/blob/b46ea46aa65149fac763671b0adcb9c4e406ec11/arrow-data/src/transform/mod.rs#L323-L344 **Describe alternatives you've considered** <!-- A clear and concise description of any alternative solutions or features you've considered. --> **Additional context** <!-- Add any other context or screenshots about the feature request here. --> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
