R-JunmingChen commented on PR #37418:
URL: https://github.com/apache/arrow/pull/37418#issuecomment-1734723401
> 3. Remap original `dict_indices` to new `changed_indices`?
remap the `indices` to new `changed_indices`. You can check the test for
better understanding
```
// input isn't compacted && its indice needs to be adjusted
CheckDictionaryCompact(dict_type, "[3, 4, 7, 0, 12, 191, 21, 8]",
"[0, 2, 4, 4, 6, 4, 2, 0, 6]", "[3, 7, 12, 21]",
"[0, 1, 2, 2, 3, 2, 1, 0, 3]");
CheckDictionaryCompact(dict_type, "[3, 4, 7, 0, 12, 191, 21, 8]",
"[4, 6, 7, 7, 6, 4, 6, 6, 6]", "[12, 21, 8]",
"[0, 1, 2, 2, 1, 0, 1, 1, 1]");
CheckDictionaryCompact(dict_type, "[3, 4, 7, 0, 12, 191, 21, 8]",
"[7, 4, 7, 7, 7, 7, 4, 7, 7]", "[12, 8]",
"[1, 0, 1, 1, 1, 1, 0, 1, 1]");
```
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