Add index to improve user search by ID

https://www.pivotaltracker.com/story/show/97932866
[#97932866]

common/src/main/resources/org/cloudfoundry/identity/uaa/db/hsqldb/V2_3_6__Add_Index_To_Users_Id.sql

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+--
+-- Cloud Foundry
+-- Copyright (c) [2015] Pivotal Software, Inc. All Rights Reserved.
+--
+-- This product is licensed to you under the Apache License, Version 2.0 (the "License").
+-- You may not use this product except in compliance with the License.
+--
+-- This product includes a number of subcomponents with
+-- separate copyright notices and license terms. Your use of these
+-- subcomponents is subject to the terms and conditions of the
+-- subcomponent's license, as noted in the LICENSE file.
+--
+
+-- HSQLDB does not support indices with function - but we create this one to keep it in synch with the other schemas
+CREATE INDEX user_perf_id ON users(id);

common/src/main/resources/org/cloudfoundry/identity/uaa/db/mysql/V2_3_6__Add_Index_To_Users_Id.sql

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+--
+-- Cloud Foundry
+-- Copyright (c) [2015] Pivotal Software, Inc. All Rights Reserved.
+--
+-- This product is licensed to you under the Apache License, Version 2.0 (the "License").
+-- You may not use this product except in compliance with the License.
+--
+-- This product includes a number of subcomponents with
+-- separate copyright notices and license terms. Your use of these
+-- subcomponents is subject to the terms and conditions of the
+-- subcomponent's license, as noted in the LICENSE file.
+--
+
+
+-- in mysql we turn off lower function during queries
+CREATE INDEX user_perf_id ON users(id);

common/src/main/resources/org/cloudfoundry/identity/uaa/db/postgresql/V2_3_6__Add_Index_To_Users_Id.sql

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+--
+-- Cloud Foundry
+-- Copyright (c) [2015] Pivotal Software, Inc. All Rights Reserved.
+--
+-- This product is licensed to you under the Apache License, Version 2.0 (the "License").
+-- You may not use this product except in compliance with the License.
+--
+-- This product includes a number of subcomponents with
+-- separate copyright notices and license terms. Your use of these
+-- subcomponents is subject to the terms and conditions of the
+-- subcomponent's license, as noted in the LICENSE file.
+--
+
+
+-- create an index to match the query
+CREATE INDEX user_perf_id ON users(LOWER(id));

common/src/test/java/org/cloudfoundry/identity/uaa/db/TestSchemaValidation.java

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+/*
+ * *****************************************************************************
+ *      Cloud Foundry
+ *      Copyright (c) [2009-2015] Pivotal Software, Inc. All Rights Reserved.
+ *      This product is licensed to you under the Apache License, Version 2.0 (the "License").
+ *      You may not use this product except in compliance with the License.
+ *
+ *      This product includes a number of subcomponents with
+ *      separate copyright notices and license terms. Your use of these
+ *      subcomponents is subject to the terms and conditions of the
+ *      subcomponent's license, as noted in the LICENSE file.
+ * *****************************************************************************
+ */
+
+package org.cloudfoundry.identity.uaa.db;
+
+import org.cloudfoundry.identity.uaa.test.JdbcTestBase;
+import org.junit.Test;
+
+import java.sql.Connection;
+import java.sql.DatabaseMetaData;
+import java.sql.ResultSet;
+
+import static org.junit.Assert.assertTrue;
+
+public class TestSchemaValidation extends JdbcTestBase {
+
+    @Test
+    public void test_v2_3_6__That_Users_Perf_Id_Index_Exists() throws Exception {
+        Connection connection = dataSource.getConnection();
+        try {
+            DatabaseMetaData meta = connection.getMetaData();
+            boolean foundIndex = false;
+            String[] tableNames = {"users", "USERS"};
+            for (String tableName : tableNames) {
+                ResultSet rs = meta.getIndexInfo(connection.getCatalog(), null, tableName, false, false);
+                while ((!foundIndex) && rs.next()) {
+                    String indexName = rs.getString("INDEX_NAME");
+                    if ("user_perf_id".equalsIgnoreCase(indexName)) {
+                        foundIndex = true;
+                    }
+                }
+                rs.close();
+                if (foundIndex) {
+                    break;
+                }
+            }
+            assertTrue("I was expecting to find index user_perf_id", foundIndex);
+        } finally {
+            connection.close();
+        }
+
+
+    }
+}