Jackie-Jiang opened a new pull request, #15869:
URL: https://github.com/apache/pinot/pull/15869

   This is a preparation for #15350
   
   Before this PR, in `IndexSegment`, `DataSource getDataSource(String column)` 
can only fetch `DataSource` for existing columns.
   
   This PR adds 2 APIs:
   - `@Nullable DataSource getDataSourceNullable(String column)`
   - `DataSource getDataSource(String column, Schema schema)`
   
   With this PR, we can add the logic to create a virtual `DataSource` when the 
column doesn't exist in the segment


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