[GitHub] [arrow] pitrou commented on a change in pull request #9100: Added a test to try and reproduce arrow-11067. Since it can only fai…

[GitBox <gi...@apache.org>]

pitrou commented on a change in pull request #9100:
URL: https://github.com/apache/arrow/pull/9100#discussion_r551852896



##########
File path: cpp/src/arrow/util/trie_test.cc
##########
@@ -175,6 +175,15 @@ TEST(Trie, EmptyString) {
   ASSERT_EQ(-1, trie.Find("x"));
 }
 
+TEST(Trie, LongString) {
+  TrieBuilder builder;
+  ASSERT_OK(builder.Append(""));
+  const Trie trie = builder.Finish();
+  auto maxlen = static_cast<size_t>(std::numeric_limits<int16_t>::max()) + 1;

Review comment:
       We may want to test with a bunch of limit-case sizes (e.g. `2^n, 2^n-1, 2^n+1` for `n` in 15, 16, 17).




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