Jackie-Jiang commented on issue #5115: Refactor the data source to include all 
information needed for query execution
URL: https://github.com/apache/incubator-pinot/pull/5115#issuecomment-597280560
 
 
   > ColumnMetadata has getTextIndexType which is either NONE or LUCENE at this 
point to indicate whether the on-disk segment doesn't have a text index (NONE) 
or what kind (LUCENE). Our goal was to use this in future when we move to 
native text indexes and load segments appropriately or convert from lucene text 
to native text.
   > 
   > In the current implementation, getTextIndexType() is being used only in 
the tests. However, my plan was to use it in PhysicalColumnIndexContainer as 
well to load the index (right now it is using indexloadingConfig)
   > 
   > Looks like this will continue to be the same since we can use 
ColumnMetadata for everything before query execution.
   
   Yes, ColumnMetadata is used for segment loading purpose (available to 
immutable segments only)

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