#1607 - ENH: Add query.exists() query ... as a convenience for "does a row exist" check

src/main/java/io/ebeaninternal/server/expression/JunctionExpression.java

@@ -375,6 +375,11 @@ class JunctionExpression<T> implements SpiJunction<T>, SpiExpression, Expression
     return exprList.apply(fetchPath);
   }
 
+  @Override
+  public boolean exists() {
+    return exprList.exists();
+  }
+
   @Override
   public FutureIds<T> findFutureIds() {
     return exprList.findFutureIds();