Aravind-Suresh commented on code in PR #10897:
URL: https://github.com/apache/pinot/pull/10897#discussion_r1236882803
##########
pinot-common/src/main/java/org/apache/pinot/common/utils/RegexpPatternConverterUtils.java:
##########
@@ -64,24 +72,56 @@ public static String likeToRegexpLike(String likePattern) {
break;
}
- String escaped = escapeMetaCharacters(likePattern.substring(start, end));
- StringBuilder sb = new StringBuilder(escaped.length() + 2);
- sb.append(prefix);
- sb.append(escaped);
- sb.append(suffix);
+ likePattern = likePattern.substring(start, end);
+ return escapeMetaCharsAndWildcards(likePattern, prefix, suffix);
+ }
+ /**
+ * Escapes the provided pattern by considering the following constraints:
+ * <ul>
+ * <li> SQL wildcards escaping is handled (_, %) </li>
+ * <li> Regex meta characters escaping is handled </li>
+ * </ul>
+ * @param input the provided input string
+ * @param prefix the prefix to be added to the output string
+ * @param suffix the suffix to be added to the output string
+ * @return the final output string
+ */
+ private static String escapeMetaCharsAndWildcards(String input, String
prefix, String suffix) {
+ StringBuilder sb = new StringBuilder();
+ sb.append(prefix);
+ // handling SQL wildcards (_, %) by replacing them with corresponding
regex equivalents
+ // we ignore them if the SQL wildcards are escaped
int i = 0;
- while (i < sb.length()) {
- char c = sb.charAt(i);
+ boolean isPrevCharBackSlash = false;
+ while (i < input.length()) {
+ char c = input.charAt(i);
if (c == '_') {
- sb.replace(i, i + 1, ".");
+ sb.append(isPrevCharBackSlash ? c : ".");
} else if (c == '%') {
- sb.replace(i, i + 1, ".*");
- i++;
+ sb.append(isPrevCharBackSlash ? c : ".*");
+ } else if (Chars.indexOf(REGEXP_METACHARACTERS, c) >= 0) {
Review Comment:
Did a minor refactor to fix this.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org
For additional commands, e-mail: commits-h...@pinot.apache.org
