kou commented on code in PR #33806:
URL: https://github.com/apache/arrow/pull/33806#discussion_r1083334566
##########
cpp/src/arrow/compute/kernels/scalar_string_ascii.cc:
##########
@@ -1505,6 +1508,13 @@ struct MatchLike {
static const RE2 kLikePatternIsStartsWith(R"(([^%_]*[^\\%_])?%+)",
kRE2Options);
// A LIKE pattern matching this regex can be translated into a suffix
search.
static const RE2 kLikePatternIsEndsWith(R"(%+([^%_]*))", kRE2Options);
+ static bool global_checked = false;
+ if (ARROW_PREDICT_FALSE(!global_checked)) {
+ RETURN_NOT_OK(RegexStatus(kLikePatternIsSubstringMatch));
+ RETURN_NOT_OK(RegexStatus(kLikePatternIsStartsWith));
+ RETURN_NOT_OK(RegexStatus(kLikePatternIsEndsWith));
Review Comment:
I see. Thanks.
##########
cpp/src/arrow/compute/kernels/scalar_string_ascii.cc:
##########
@@ -1505,6 +1508,13 @@ struct MatchLike {
static const RE2 kLikePatternIsStartsWith(R"(([^%_]*[^\\%_])?%+)",
kRE2Options);
// A LIKE pattern matching this regex can be translated into a suffix
search.
static const RE2 kLikePatternIsEndsWith(R"(%+([^%_]*))", kRE2Options);
+ static bool global_checked = false;
Review Comment:
Ah, I see. `std::call_once` isn't suitable here.
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