wjones127 commented on a change in pull request #8844:
URL: https://github.com/apache/arrow/pull/8844#discussion_r606019594
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File path: cpp/src/gandiva/regex_util.cc
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@@ -30,8 +30,14 @@ Status RegexUtil::SqlLikePatternToPcre(const std::string&
sql_pattern, char esca
for (size_t idx = 0; idx < sql_pattern.size(); ++idx) {
auto cur = sql_pattern.at(idx);
+ if (idx == 0 && cur != '%') {
+ pcre_pattern += '^';
+ } else if (idx == 0 && cur == '%') {
+ continue;
+ }
+
// Escape any char that is special for pcre regex
- if (pcre_regex_specials_.find(cur) != pcre_regex_specials_.end()) {
+ if (pcre_regex_specials_.find(cur) != pcre_regex_specials_.end() && cur !=
escape_char) {
Review comment:
This change enables using `\` as an escape character in LIKE statements.
For example, `col like '\_%'` can match anything starting with an underscore.
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