2010-05-06  Aaron S. Hawley  <Aaron.Hawley@vtinfo.com>

	* Zend/Db/Adapter/Db2.php (describeTable): Improve performance of
	i5/OS query by avoiding UPPER() and DISTINCT.  It's not uncommon
	for AS/400 machines to have distinct columns numbering in the tens
	of millions.

--- Zend/Db/Adapter/Db2.php	2010-04-29 12:37:50.021322300 -0400
+++ Zend/Db/Adapter/Db2.php	2010-05-06 11:44:19.584306100 -0400
@@ -399,7 +399,7 @@
         } else {
 
             // DB2 On I5 specific query
-            $sql = "SELECT DISTINCT C.TABLE_SCHEMA, C.TABLE_NAME, C.COLUMN_NAME, C.ORDINAL_POSITION,
+            $sql = "SELECT C.TABLE_SCHEMA, C.TABLE_NAME, C.COLUMN_NAME, C.ORDINAL_POSITION,
                 C.DATA_TYPE, C.COLUMN_DEFAULT, C.NULLS ,C.LENGTH, C.SCALE, LEFT(C.IDENTITY,1),
                 LEFT(tc.TYPE, 1) AS tabconsttype, k.COLSEQ
                 FROM QSYS2.SYSCOLUMNS C
@@ -411,10 +411,10 @@
                        AND C.TABLE_NAME = k.TABLE_NAME
                        AND C.COLUMN_NAME = k.COLUMN_NAME)
                 WHERE "
-                 . $this->quoteInto('UPPER(C.TABLE_NAME) = UPPER(?)', $tableName);
+                 . $this->quoteInto('C.TABLE_NAME = ?', $tableName);
 
             if ($schemaName) {
-                $sql .= $this->quoteInto(' AND UPPER(C.TABLE_SCHEMA) = UPPER(?)', $schemaName);
+                $sql .= $this->quoteInto(' AND C.TABLE_SCHEMA = ?', $schemaName);
             }
 
             $sql .= " ORDER BY C.ORDINAL_POSITION FOR FETCH ONLY";