define hash function for string_view

apache · Oct 27, 2020 · eec6dfd · eec6dfd
1 parent b8936d5
commit eec6dfd
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/cpp/src/gandiva/in_holder.h b/cpp/src/gandiva/in_holder.h
@@ -20,6 +20,7 @@
 #include <string>
 #include <unordered_set>
 
+#include "arrow/util/hashing.h"
 #include "gandiva/arrow.h"
 #include "gandiva/gandiva_aliases.h"
 
@@ -57,7 +58,14 @@ class InHolder<std::string> {
  }
 
  private:
- std::unordered_set<arrow::util::string_view> values_lookup_;
+ struct string_view_hash {
+ public:
+ std::size_t operator()(arrow::util::string_view v) const {
+ return arrow::internal::ComputeStringHash<0>(v.data(), v.length());
+ }
+ };
+
+ std::unordered_set<arrow::util::string_view, string_view_hash> values_lookup_;
  const std::unordered_set<std::string> values_;
 };