Github user sounakr commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1751#discussion_r161431619
--- Diff: format/src/main/thrift/carbondata.thrift ---
@@ -45,6 +45,7 @@ struct BlockletBTreeIndex{
struct BlockletMinMaxIndex{
1: required list<binary> min_values; //Min value of all columns of one blocklet Bit-Packed
2: required list<binary> max_values; //Max value of all columns of one blocklet Bit-Packed
+ 3: optional list<byte> null_value; // Null Bool turn on if null value present.
--- End diff --
Done. Stored as a Bitset
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