kiszk commented on issue #6981:
URL: https://github.com/apache/arrow/pull/6981#issuecomment-616507292
At first, this PR address only test cases. This PR does not address the
routines (like `column_writer.h`) yet. To update test cases can clarify the
specification and implementation like this.
In this change, int96, which is a pair of uint64 and uint32, is stored in
memory as follows:
```
For little-endian
Int96 Int96_min = {{1024, 2048, 4096}};
00 04 00 00 00 08 00 00 00 10 00 00
~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~
uint64 (LE) uint32 (LE)
For big-endian,
Int96 Int96_min = {{2048, 1024, 4096}};
00 00 08 00 00 00 04 00 00 00 10 00
~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~
uint64 (BE) uint32 (BE)
```
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