cyb70289 commented on a change in pull request #12504:
URL: https://github.com/apache/arrow/pull/12504#discussion_r816417705
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File path: cpp/src/arrow/csv/writer.cc
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@@ -328,6 +351,26 @@ class QuotedColumnPopulator : public ColumnPopulator {
}
private:
+ // Returns true if there's no quote in the string array
+ // similar to std::find, but with much better performance
+ static bool NoQuoteInArray(const StringArray& array) {
+ const uint8_t* data = array.raw_data() + array.value_offset(0);
+ const int64_t buffer_size = array.total_values_length();
+ const uint8_t* const data_end = data + buffer_size;
+
+ for (int64_t i = 0; i < buffer_size / 16; ++i) {
+ bool r = false;
+ for (int i = 0; i < 16; ++i) {
+ r |= data[i] == '"';
+ }
Review comment:
`std::string_view::find` and `std::char_traits<char>::find` calls
`memchr` internaly. But `std::find`doesn't (maybe because the code has to be
general for all kinds of iterators, even a list).
https://godbolt.org/z/asGx1f35s
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