FIX: Cache exist query results

ebean-core/src/main/java/io/ebeaninternal/api/SpiQuery.java

@@ -81,6 +81,11 @@ public interface SpiQuery<T> extends Query<T>, SpiQueryFetch, TxnProfileEventCod
      */
     ID_LIST(FIND_ID_LIST, "findIds"),
 
+    /**
+     * Find exists.
+     */
+    EXISTS(FIND_EXISTS, "exists"),
+
     /**
      * Find single attribute.
      */

ebean-core/src/main/java/io/ebeaninternal/api/TxnProfileEventCodes.java

@@ -26,6 +26,7 @@ public interface TxnProfileEventCodes {
   String FIND_MANY = "fm";
   String FIND_ITERATE = "fe";
   String FIND_ID_LIST = "fi";
+  String FIND_EXISTS = "ex";
   String FIND_ATTRIBUTE = "fa";
   String FIND_COUNT = "fc";
   String FIND_SUBQUERY = "fs";

ebean-core/src/main/java/io/ebeaninternal/server/core/DefaultServer.java

@@ -1291,7 +1291,12 @@ public final class DefaultServer implements SpiServer, SpiEbeanServer {
   @Override
   public <T> boolean exists(Query<T> ormQuery, Transaction transaction) {
     Query<T> ormQueryCopy = ormQuery.copy().setMaxRows(1);
-    SpiOrmQueryRequest<?> request = createQueryRequest(Type.ID_LIST, ormQueryCopy, transaction);
+    SpiOrmQueryRequest<?> request = createQueryRequest(Type.EXISTS, ormQueryCopy, transaction);
+    List<Object> ids = request.getFromQueryCache();
+    if (ids != null) {
+      return !ids.isEmpty();
+    }
+
     try {
       request.initTransIfRequired();
       return !request.findIds().isEmpty();