SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier t1.col
    Identifier t1.col_sq
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test2 (alias t2)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier test1 (alias t1)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.col
        Identifier t2.col
   Set
