fix one character input case.

lib_mysqludf_stem.cc

@@ -140,7 +140,7 @@ char *stem_word(UDF_INIT *initid, UDF_ARGS *args, char *result, unsigned long *l
 	int len;
 	char *r, *e, *b, *c;
 
-	if (!args->args[1] || args->lengths[1] == 1) {
+	if (!args->args[1]) {
 		*is_null=1;
 		return 0;
 	}
@@ -167,7 +167,6 @@ char *stem_word(UDF_INIT *initid, UDF_ARGS *args, char *result, unsigned long *l
 	e = c + args->lengths[1];
 	
 	int i=0;
-	
 	for(; c <= e ;c++){
 		if(c == e || (*c >= 0 && *c <= 38) || (*c >= 40 && *c <= 47) || (*c >= 58 && *c <= 64) || (*c >= 91 && *c <= 96) || (*c >= 123 && *c <= 126)) {
 			if (b != c) {

tests/stem_word.result

@@ -15,3 +15,6 @@ car bar open
 SELECT stem_word("xyz", "Xxx Yyys Zzzer");
 stem_word("xyz", "Xxx Yyys Zzzer")
 Xxx Yyys Zzzer
+SELECT stem_word("english", "a");
+stem_word("english", "a")
+a

tests/stem_word.test

@@ -20,3 +20,4 @@ SELECT stem_word("dutch", "deuren");
 SELECT stem_word("dutch", "deuren boekjes;stuiter stuiteren auto's");
 SELECT stem_word("english", "cars#bars#opening");
 SELECT stem_word("xyz", "Xxx Yyys Zzzer");
+SELECT stem_word("english", "a");