CreateQuery b (children 3)
 Identifier b
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration b_id (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier uniq
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
 Storage definition (children 3)
  Function AggregatingMergeTree
  Function tuple (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
