deemoliu commented on code in PR #12392:
URL: https://github.com/apache/pinot/pull/12392#discussion_r1576631085
##########
pinot-common/src/main/java/org/apache/pinot/common/function/scalar/StringFunctions.java:
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@@ -581,6 +584,111 @@ public static String[] split(String input, String
delimiter, int limit) {
return StringUtils.splitByWholeSeparator(input, delimiter, limit);
}
+ /**
+ * @param input an input string for prefix strings generations.
+ * @param maxlength the max length of the prefix strings for the string.
+ * @return generate an array of prefix strings of the string that are
shorter than the specified length.
+ */
+ @ScalarFunction
+ public static String[] prefixes(String input, int maxlength) {
+ int arrLength = Math.min(maxlength, input.length());
+ String[] prefixArr = new String[arrLength];
+ for (int prefixIdx = 1; prefixIdx <= arrLength; prefixIdx++) {
+ prefixArr[prefixIdx - 1] = input.substring(0, prefixIdx);
+ }
+ return prefixArr;
+ }
+
+ /**
+ * @param input an input string for prefix strings generations.
+ * @param maxlength the max length of the prefix strings for the string.
+ * @param prefix the prefix to be prepended to prefix strings generated.
e.g. '^' for regex matching
+ * @return generate an array of prefix matchers of the string that are
shorter than the specified length.
+ */
+ @ScalarFunction(nullableParameters = true, names = {"prefix"})
+ public static String[] prefixesWithPrefix(String input, int maxlength,
@Nullable String prefix) {
+ if (prefix == null) {
+ return prefixes(input, maxlength);
+ }
+ int arrLength = Math.min(maxlength, input.length());
+ String[] prefixArr = new String[arrLength];
+ for (int prefixIdx = 1; prefixIdx <= arrLength; prefixIdx++) {
+ prefixArr[prefixIdx - 1] = prefix + input.substring(0, prefixIdx);
+ }
+ return prefixArr;
+ }
+
+ /**
+ * @param input an input string for suffix strings generations.
+ * @param maxlength the max length of the suffix strings for the string.
+ * @return generate an array of suffix strings of the string that are
shorter than the specified length.
+ */
+ @ScalarFunction
+ public static String[] suffixes(String input, int maxlength) {
+ int arrLength = Math.min(maxlength, input.length());
+ String[] suffixArr = new String[arrLength];
+ for (int suffixIdx = 1; suffixIdx <= arrLength; suffixIdx++) {
+ suffixArr[suffixIdx - 1] = input.substring(input.length() - suffixIdx);
+ }
+ return suffixArr;
+ }
+
+ /**
+ * @param input an input string for suffix strings generations.
+ * @param maxlength the max length of the suffix strings for the string.
+ * @param suffix the suffix string to be appended for suffix strings
generated. e.g. '$' for regex matching.
+ * @return generate an array of suffix matchers of the string that are
shorter than the specified length.
+ */
+ @ScalarFunction(nullableParameters = true, names = {"suffix"})
Review Comment:
updated, thanks @Jackie-Jiang
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