walterddr commented on code in PR #8893:
URL: https://github.com/apache/pinot/pull/8893#discussion_r913887685
##########
pinot-common/src/main/java/org/apache/pinot/common/utils/RegexpPatternConverterUtils.java:
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@@ -33,7 +33,49 @@ private RegexpPatternConverterUtils() {
* Converts a LIKE pattern into REGEXP_LIKE pattern.
*/
public static String likeToRegexpLike(String likePattern) {
- return "^" + escapeMetaCharacters(likePattern).replace('_',
'.').replace("%", ".*") + "$";
+ int start = 0;
+ int end = likePattern.length();
+ String prefix = "^";
+ String suffix = "$";
+ switch (likePattern.length()) {
+ case 0:
+ return "^$";
+ case 1:
+ if (likePattern.charAt(0) == '%') {
+ return "^.*$";
+ }
+ break;
+ default:
+ if (likePattern.charAt(0) == '%') {
Review Comment:
thanks for the explanation. it just seems ok to recursively prune out
leading/trailing `%` e.g. instead of
`start = 1;` we can do start equal to first non `%` char.
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