From d381d20f85f79f0a38c0be16d703baf149fbc8e2 Mon Sep 17 00:00:00 2001
From: Lukas Eder <lukas.eder@gmail.com>
Date: Wed, 11 Jan 2012 20:29:02 +0000
Subject: [PATCH] [#1049] Optimise GREATEST() and LEAST() simulations for
 Sybase, ASE, SQL Server, Derby - added more integration tests for GREATEST()
 and LEAST(). In case these functions are simulated using subqueries, MAX()
 and UNION ALL(), be sure that all dialects still support them, even they only
 have limited support for derived tables.

---
 .../src/org/jooq/test/jOOQAbstractTest.java   | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/jOOQ-test/src/org/jooq/test/jOOQAbstractTest.java b/jOOQ-test/src/org/jooq/test/jOOQAbstractTest.java
index d6347e31bc..12d144b94a 100644
--- a/jOOQ-test/src/org/jooq/test/jOOQAbstractTest.java
+++ b/jOOQ-test/src/org/jooq/test/jOOQAbstractTest.java
@@ -6549,6 +6549,26 @@ public abstract class jOOQAbstractTest<
         assertEquals("4", record.getValue(2));
         assertEquals("1", record.getValue(3));
 
+        // Greatest and least with tables. If they're simulated using subqueries
+        // there is a risk of breaking this functionality due to limited support
+        // for subqueries and derived tables...
+        Result<Record> result = create()
+            .select(TBook_ID(),
+                    greatest(TBook_ID(),
+                        TBook_AUTHOR_ID(),
+                        TBook_LANGUAGE_ID()),
+                    least(TBook_ID(),
+                        TBook_AUTHOR_ID(),
+                        TBook_LANGUAGE_ID()))
+            .from(TBook())
+            .orderBy(TBook_ID())
+            .fetch();
+
+        assertEquals(4, result.size());
+        assertEquals(BOOK_IDS, result.getValues(TBook_ID()));
+        assertEquals(asList(1, 2, 4, 4), result.getValues(1));
+        assertEquals(asList(1, 1, 2, 2), result.getValues(2));
+
         // Mathematical functions
         switch (getDialect()) {
             case SQLITE: