clintropolis opened a new pull request #11925:
URL: https://github.com/apache/druid/pull/11925
### Description
Follow-up to #11829, this PR adds safeguards to prevent using `BitmapIndex`
(which still relies on the underlying column using a String typed dictionary)
from being used directly for non-virtual columns that are dictionary encoded,
but not String typed. Virtual columns may still provide bitmap indexes, but
only dictionary encoded string columns will supply them directly from the
column after the changes of this patch.
We should be able to remove these in the future if we modify filtering to be
more friendly to non-string types, but until then this will prevent funny class
cast exceptions when filters notice that a column has a bitmap and so will use
it, but then fail when actually trying to use them.
<hr>
##### Key changed/added classes in this PR
* `ColumnSelectorBitmapIndexSelector`
<hr>
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- [x] been tested in a test Druid cluster.
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