CreateQuery t4 (children 2)
 Identifier t4
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Identifier ref_1.vkey (alias c_2_c48_2)
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t0 (alias ref_0)
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier t1 (alias ref_1)
      TableJoin (children 1)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier ref_0.c2
         Identifier ref_1.c8
