SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function coalesce (alias x) (children 1)
     ExpressionList (children 4)
      Identifier t1.x
      Identifier t2.x
      Identifier t3.x
      Identifier t4.x
   TablesInSelectQuery (children 4)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t2
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier x
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t3
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier x
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t4
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier x
