SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function getServerSetting (children 1)
     ExpressionList (children 2)
      Literal \'allow_use_jemalloc_memory\'
      Literal \'background_merges_mutations_scheduling_policy\'
