Y Ethan Guo created HUDI-9178:
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             Summary: Unifying expressions into secondary index, record index, 
and bloom index
                 Key: HUDI-9178
                 URL: https://issues.apache.org/jira/browse/HUDI-9178
             Project: Apache Hudi
          Issue Type: Sub-task
            Reporter: Y Ethan Guo


Expression Index should not be a specific index type.  All indexes should 
support expressions, i.e., function(s) of column(s), and the simplest case is 
the identity of a table column.

In this way, a newly added index can also be built on expressions as a built-in 
feature.



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