From c21dfd2f31a775f69f2c4af8f2572f5fda456a29 Mon Sep 17 00:00:00 2001
From: lukaseder <lukas.eder@gmail.com>
Date: Sun, 18 Jan 2015 12:02:50 +0100
Subject: [PATCH] [#3962] The H2 emulation of SHR might produce rounding errors

---
 jOOQ/src/main/java/org/jooq/impl/Expression.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/jOOQ/src/main/java/org/jooq/impl/Expression.java b/jOOQ/src/main/java/org/jooq/impl/Expression.java
index 8dcaaf4b64..7c4b2e9304 100644
--- a/jOOQ/src/main/java/org/jooq/impl/Expression.java
+++ b/jOOQ/src/main/java/org/jooq/impl/Expression.java
@@ -171,10 +171,13 @@ class Expression<T> extends AbstractFunction<T> {
 
         // Many dialects don't support shifts. Use multiplication/division instead
         else if (SHL == operator && asList(H2, HSQLDB).contains(family)) {
-            return lhs.mul(DSL.power(two(), rhsAsNumber()));
+            return lhs.mul((Field<? extends Number>) DSL.power(two(), rhsAsNumber()).cast(lhs));
         }
+
+        // [#3962] This emulation is expensive. If this is emulated, BitCount should
+        // use division instead of SHR directly
         else if (SHR == operator && asList(H2, HSQLDB).contains(family)) {
-            return lhs.div(DSL.power(two(), rhsAsNumber()));
+            return lhs.div((Field<? extends Number>) DSL.power(two(), rhsAsNumber()).cast(lhs));
         }
 
         // Some dialects support shifts as functions