wjones127 commented on code in PR #13851:
URL: https://github.com/apache/arrow/pull/13851#discussion_r1008418347
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cpp/src/arrow/type.cc:
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@@ -2093,17 +2101,33 @@ std::string DictionaryType::ComputeFingerprint() const {
}
std::string ListType::ComputeFingerprint() const {
- const auto& child_fingerprint = children_[0]->fingerprint();
+ const auto& child_fingerprint = value_type()->fingerprint();
if (!child_fingerprint.empty()) {
- return TypeIdFingerprint(*this) + "{" + child_fingerprint + "}";
+ std::stringstream ss;
+ ss << TypeIdFingerprint(*this);
+ if (value_field()->nullable()) {
+ ss << 'n';
+ } else {
+ ss << 'N';
+ }
Review Comment:
nullability of internal field is now part of the fingerprint.
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