From 10e97b55c986fce21179b31ab020f8a248830d49 Mon Sep 17 00:00:00 2001
From: Par Winzell <zell@threerings.net>
Date: Tue, 15 Feb 2011 23:21:11 +0000
Subject: [PATCH] PostgreSQL gets very confused when date_part() is used in a
 GROUP BY and the part bit isn't a constant. It doesn't recognize the selected
 values as being identical to the grouped-by values, and throws an error. So
 we use a literal here.

---
 .../java/com/samskivert/depot/impl/PostgreSQLBuilder.java     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java b/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
index 3e6ce94..e357b7d 100644
--- a/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
+++ b/src/main/java/com/samskivert/depot/impl/PostgreSQLBuilder.java
@@ -87,8 +87,8 @@ public class PostgreSQLBuilder
 
         @Override public Void visit (DatePart exp)
         {
-            return appendFunctionCall(
-                "date_part", Exps.value(translateDatePart(exp.getPart())), exp.getArg());
+            String datePart = "'" + translateDatePart(exp.getPart()) + "'";
+            return appendFunctionCall("date_part", Exps.literal(datePart), exp.getArg());
         }
 
         @Override