CreateQuery map_test_index_map_keys (children 3)
 Identifier map_test_index_map_keys
 Columns definition (children 2)
  ExpressionList (children 2)
   ColumnDeclaration row_id (children 1)
    DataType UInt32
   ColumnDeclaration map (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType String
      DataType String
  ExpressionList (children 1)
   Index (children 2)
    Function mapKeys (children 1)
     ExpressionList (children 1)
      Identifier map
    Function bloom_filter (children 1)
     ExpressionList
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Identifier row_id
  Set
