CreateQuery t3 (children 2)
 Identifier t3
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Identifier ref_0.vkey (alias c_2_c16_0)
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t0 (alias ref_0)
