SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function countMatches (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Literal \'foobarfoo\'
          Literal UInt64_9
      Literal \'foo\'