I need to create two (or more) issues for custom_metadata in Footer ... https://lists.apache.org/thread.html/c3b3d1456b7062a435f6795c0308ccb7c8fe55c818cfed2cf55f76c5@%3Cdev.arrow.apache.org%3E
and memory map based on fd ... https://lists.apache.org/thread.html/83373ab00f552ee8afd2bac2b2721468b3f28fe283490e379998453a@%3Cdev.arrow.apache.org%3E For the first one, is this five separate JIRA issues? - [Format] add a custom_metadata:[KeyValue] field to the Footer table in File.fbs - [C++] access File Footer custom_metadata - [Python] access File Footer custom_metadata - [JS] access File Footer custom_metadata - [Java] access File Footer custom_metadata For the second, is it four? (One per language?) - [C++] retrieve fd of open memory mapped file and Open() memory mapped file by fd - [Python] retrieve fd of open memory mapped file and Open() memory mapped file by fd - [JS] retrieve fd of open memory mapped file and Open() memory mapped file by fd - [Java] retrieve fd of open memory mapped file and Open() memory mapped file by fd (I will also work on ARROW-5916 if I can carve out the time)
