mjsax commented on a change in pull request #11582:
URL: https://github.com/apache/kafka/pull/11582#discussion_r771737792



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/StoreQueryUtils.java
##########
@@ -16,18 +16,78 @@
  */
 package org.apache.kafka.streams.state.internals;
 
+import org.apache.kafka.common.utils.Bytes;
 import org.apache.kafka.streams.processor.StateStore;
 import org.apache.kafka.streams.processor.StateStoreContext;
 import org.apache.kafka.streams.processor.api.RecordMetadata;
+import org.apache.kafka.streams.query.FailureReason;
+import org.apache.kafka.streams.query.KeyQuery;
 import org.apache.kafka.streams.query.Position;
 import org.apache.kafka.streams.query.PositionBound;
 import org.apache.kafka.streams.query.Query;
 import org.apache.kafka.streams.query.QueryResult;
+import org.apache.kafka.streams.state.KeyValueStore;
 
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.util.Map;
 
+import static org.apache.kafka.common.utils.Utils.mkEntry;
+import static org.apache.kafka.common.utils.Utils.mkMap;
+
 public final class StoreQueryUtils {
 
+    /**
+     * a utility interface to facilitate stores' query dispatch logic,
+     * allowing them to generically store query execution logic as the values
+     * in a map.
+     */
+    @FunctionalInterface

Review comment:
       I see. So we should add it elsewhere, too (of course not as part of the 
IQ work).




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