text: SET allow_experimental_data_skipping_indices=1;
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b Nullable(String), INDEX b_index b TYPE set(0) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a');
  insert into nullable_set_index values (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '--';
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b Nullable(String), INDEX b_index b TYPE set(1) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a');
  insert into nullable_set_index values (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '--';
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b Nullable(String), INDEX b_index b TYPE set(0) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a'), (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '----';
  
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b LowCardinality(Nullable(String)), INDEX b_index b TYPE set(0) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a');
  insert into nullable_set_index values (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '--';
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b LowCardinality(Nullable(String)), INDEX b_index b TYPE set(1) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a');
  insert into nullable_set_index values (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '--';
  
  drop table if exists nullable_set_index;
  create table nullable_set_index (a UInt64, b LowCardinality(Nullable(String)), INDEX b_index b TYPE set(0) GRANULARITY 8192) engine = MergeTree order by a;
  insert into nullable_set_index values (1, 'a'), (2, 'b');
  select * from nullable_set_index where b = 'a';
  select '-';
  select * from nullable_set_index where b = 'b';
  select '-';
  select * from nullable_set_index where b = 'c';
  select '----';
  
  drop table if exists nullable_set_index;
  
  