SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal UInt64_1 (alias 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
