SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function getServerSetting (children 2)
     ExpressionList (children 1)
      Literal UInt64_10
     ExpressionList (children 1)
      Literal \'allow_use_jemalloc_memory\'
