SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier x
    Identifier arr1
    Identifier arr2
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       ColumnsRegexpMatcher
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier arr1
    OrderByElement (children 1)
     Identifier arr2
