metalmatze commented on PR #36165:
URL: https://github.com/apache/arrow/pull/36165#issuecomment-1597571428
Turns out this is actually not a bug where the underlying bitmap is null,
but we need to overwrite the dictionaryBuilder to use the idxBuilder's `IsNull`.
```go
func (b *dictionaryBuilder) IsNull(i int) bool { return
b.idxBuilder.IsNull(i) }
```
I'll update this PR tomorrow.
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