donnerpeter commented on code in PR #11857:
URL: https://github.com/apache/lucene/pull/11857#discussion_r997349204


##########
lucene/analysis/common/src/java/org/apache/lucene/analysis/hunspell/Hunspell.java:
##########
@@ -614,11 +617,27 @@ private void doSuggest(
       Runnable checkCanceled) {
     Hunspell suggestionSpeller =
         new Hunspell(dictionary, policy, checkCanceled) {
+          final Map<String, Optional<Root<CharsRef>>> compoundCache = new 
HashMap<>();
+
           @Override
           boolean acceptsStem(int formID) {
             return !dictionary.hasFlag(formID, dictionary.noSuggest)
                 && !dictionary.hasFlag(formID, dictionary.subStandard);
           }
+
+          @Override
+          Root<CharsRef> findStem(
+              char[] chars, int offset, int length, WordCase originalCase, 
WordContext context) {
+            if (context == COMPOUND_BEGIN && originalCase == null) {
+              return compoundCache
+                  .computeIfAbsent(
+                      new String(chars, offset, length),
+                      __ ->
+                          Optional.ofNullable(super.findStem(chars, offset, 
length, null, context)))

Review Comment:
   computeIfAbsent is called even if there's an associated null value. And 
containsKey+get+put finds the hash entry several times



##########
lucene/analysis/common/src/java/org/apache/lucene/analysis/hunspell/Hunspell.java:
##########
@@ -614,11 +617,27 @@ private void doSuggest(
       Runnable checkCanceled) {
     Hunspell suggestionSpeller =
         new Hunspell(dictionary, policy, checkCanceled) {
+          final Map<String, Optional<Root<CharsRef>>> compoundCache = new 
HashMap<>();
+
           @Override
           boolean acceptsStem(int formID) {
             return !dictionary.hasFlag(formID, dictionary.noSuggest)
                 && !dictionary.hasFlag(formID, dictionary.subStandard);
           }
+
+          @Override
+          Root<CharsRef> findStem(
+              char[] chars, int offset, int length, WordCase originalCase, 
WordContext context) {
+            if (context == COMPOUND_BEGIN && originalCase == null) {
+              return compoundCache
+                  .computeIfAbsent(
+                      new String(chars, offset, length),
+                      __ ->
+                          Optional.ofNullable(super.findStem(chars, offset, 
length, null, context)))

Review Comment:
   computeIfAbsent lambda is called even if there's an associated null value. 
And containsKey+get+put finds the hash entry several times



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