SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function substring (children 1)
     ExpressionList (children 3)
      Identifier a
      Literal UInt64_1
      Literal UInt64_3
    Function substring (children 1)
     ExpressionList (children 3)
      Function substring (children 1)
       ExpressionList (children 3)
        Function substring (children 1)
         ExpressionList (children 3)
          Identifier a
          Identifier c
          Function count (children 1)
           ExpressionList (children 1)
            Identifier b
        Literal UInt64_1
        Function count (children 1)
         ExpressionList (children 1)
          Identifier b
      Literal UInt64_1
      Function count (children 1)
       ExpressionList (children 1)
        Identifier b
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier group_by_all