Github user xuchuanyin commented on the issue:
https://github.com/apache/carbondata/pull/2665
@ravipesala What I want to say is that even if we support composite index,
the current datamap chooser still failed to work, because it composites
irrelevant expressions and forwards that to the datamap ignoring that the
expression contains non-index columns. You can see it from the logs in the
maillist that currently we have to deal 27 expressions while after applying
this patch we only need to deal 4 expressions.
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