Add method signature to enable compilation until adding fluent API su…

…pport.

See #397

src/main/java/org/springframework/data/keyvalue/repository/support/QuerydslKeyValueRepository.java

@@ -18,6 +18,7 @@
 import static org.springframework.data.keyvalue.repository.support.KeyValueQuerydslUtils.*;
 
 import java.util.Optional;
+import java.util.function.Function;
 
 import org.springframework.dao.IncorrectResultSizeDataAccessException;
 import org.springframework.data.domain.Page;
@@ -30,6 +31,7 @@
 import org.springframework.data.querydsl.QuerydslPredicateExecutor;
 import org.springframework.data.querydsl.SimpleEntityPathResolver;
 import org.springframework.data.repository.core.EntityInformation;
+import org.springframework.data.repository.query.FluentQuery;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
@@ -214,6 +216,12 @@ public boolean exists(Predicate predicate) {
 		return count(predicate) > 0;
 	}
 
+	@Override
+	public <S extends T, R> R findBy(Predicate predicate,
+			Function<FluentQuery.FetchableFluentQuery<S>, R> queryFunction) {
+		throw new UnsupportedOperationException("Not yet supported");
+	}
+
 	/**
 	 * Creates executable query for given {@link Predicate}.
 	 *