raghavyadav01 opened a new pull request, #15006:
URL: https://github.com/apache/pinot/pull/15006

   PR add  support for enabling Custom MAP encoded forwarded index creator and 
reader. 
   Summary :
   
   - immutable Segment Index Build Path
   > Collect MapColumnPreIndexStatsCollector during gather stats phase
   > Collect MAP encoded column custom metadata properties file and merge with 
segment metadata.properties file. 
   
   - Immutable Segment Loader Path
   > Initialize MAP column with child columns (keys)
   > Collect all the key level indexes into custom MAP column IndexContainer.
   > For MAP encoded columns initialize Custom Forward Index Reader with child 
column indexes buffer.
   
   - Couple of MAP data column bug fixes
   
   > Fix MAP convert for segment upload use case.
   > Fix Dictionary Index reader API . 
   


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