Github user HuJiayin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7812#discussion_r35956865
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -680,4 +680,57 @@ public int hashCode() {
}
return result;
}
+
+ /**
+ * Soundex mapping table
+ */
+ private static final byte[] US_ENGLISH_MAPPING = {'0', '1', '2', '3',
'0', '1', '2', '7',
+ '0', '2', '2', '4', '5', '5', '0', '1', '2', '6', '2', '3', '0', '1',
'7', '2', '0', '2'};
+
+ /**
+ * Encodes a string into a Soundex value. Soundex is an encoding used to
relate similar names,
+ * but can also be used as a general purpose scheme to find word with
similar phonemes.
+ * https://en.wikipedia.org/wiki/Soundex
+ */
+ public UTF8String soundex() {
+ if (numBytes == 0) {
+ return EMPTY_UTF8;
+ }
+
+ byte b = getByte(0);
+ if ('a' <= b && b <= 'z') {
+ b -= 32;
+ } else if (b < 'A' || 'Z' < b) {
+ // first character must be a letter
+ return this;
+ }
+ byte sx[] = {'0', '0', '0', '0'};
+ sx[0] = b;
+ int sxi = 1;
+ int idx = b - 'A';
+ byte lastCode = US_ENGLISH_MAPPING[idx];
+
+ for (int i = 1; i < numBytes; i++) {
+ b = getByte(i);
+ if ('a' <= b && b <= 'z') {
--- End diff --
yes, maybe the Chinese encoding I met previously is not standard.
the other problem is
the current code failed at z測試, actual: Z000; expected: z測試
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