SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function groupArrayLastArray (children 2)
     ExpressionList (children 1)
      Literal Array_[\'1\', \'2\', \'3\', \'4\', \'5\', \'6\']
     ExpressionList (children 1)
      Literal UInt64_3