Fix used schema in CreateSynonym.update()

h2/src/main/org/h2/command/ddl/CreateSynonym.java

@@ -56,7 +56,7 @@ public class CreateSynonym extends SchemaCommand {
         data.session = session;
         db.lockMeta(session);
 
-        if (data.synonymForSchema.findTableOrView(session, data.synonymName) != null) {
+        if (getSchema().findTableOrView(session, data.synonymName) != null) {
             throw DbException.get(ErrorCode.TABLE_OR_VIEW_ALREADY_EXISTS_1, data.synonymName);
         }
 

h2/src/test/org/h2/test/scripts/TestScript.java

@@ -111,7 +111,7 @@ public class TestScript extends TestBase {
             testScript("datatypes/" + s + ".sql");
         }
         for (String s : new String[] { "alterTableAdd", "alterTableDropColumn",
-                "createAlias", "createView", "createTable", "createTrigger",
+                "createAlias", "createSynonym", "createView", "createTable", "createTrigger",
                 "dropSchema" }) {
             testScript("ddl/" + s + ".sql");
         }

h2/src/test/org/h2/test/scripts/ddl/createSynonym.sql

+-- Copyright 2004-2018 H2 Group. Multiple-Licensed under the MPL 2.0,
+-- and the EPL 1.0 (http://h2database.com/html/license.html).
+-- Initial Developer: H2 Group
+--
+
+CREATE SCHEMA SCHEMA1;
+> ok
+
+CREATE SCHEMA SCHEMA2;
+> ok
+
+CREATE TABLE SCHEMA1.T1(K BIGINT PRIMARY KEY, V VARCHAR);
+> ok
+
+CREATE SYNONYM SCHEMA1.T1 FOR SCHEMA1.T1;
+> exception TABLE_OR_VIEW_ALREADY_EXISTS_1
+
+CREATE SYNONYM SCHEMA2.T1 FOR SCHEMA1.T1;
+> ok
+
+DROP SYNONYM SCHEMA2.T1;
+> ok
+
+SET SCHEMA SCHEMA2;
+> ok
+
+CREATE SYNONYM T1 FOR SCHEMA1.T1;
+> ok
+
+DROP SYNONYM T1;
+> ok
+
+SET SCHEMA SCHEMA1;
+> ok
+
+CREATE SYNONYM T1 FOR T1;
+> exception TABLE_OR_VIEW_ALREADY_EXISTS_1
+
+CREATE SYNONYM SCHEMA2.T1 FOR T1;
+> ok
+
+DROP SYNONYM SCHEMA2.T1;
+> ok
+
+SET SCHEMA PUBLIC;
+> ok
+
+DROP SCHEMA SCHEMA2 CASCADE;
+> ok
+
+DROP SCHEMA SCHEMA1 CASCADE;
+> ok