Fixes exception thrown if renamed schema name missed on AlterSchemaPushDownMetaDataRefresher (#34465)

Author: terrymanu

mode/core/src/main/java/org/apache/shardingsphere/mode/metadata/refresher/metadata/pushdown/type/schema/AlterSchemaPushDownMetaDataRefresher.java

@@ -17,7 +17,6 @@
 
 package org.apache.shardingsphere.mode.metadata.refresher.metadata.pushdown.type.schema;
 
-import com.google.common.base.Preconditions;
 import org.apache.shardingsphere.infra.config.props.ConfigurationProperties;
 import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
 import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
@@ -39,9 +38,10 @@ public final class AlterSchemaPushDownMetaDataRefresher implements PushDownMetaD
     public void refresh(final MetaDataManagerPersistService metaDataManagerPersistService, final ShardingSphereDatabase database, final Collection<String> logicDataSourceNames,
                         final String schemaName, final DatabaseType databaseType, final AlterSchemaStatement sqlStatement, final ConfigurationProperties props) throws SQLException {
         Optional<String> renameSchemaName = sqlStatement.getRenameSchema().map(optional -> optional.getValue().toLowerCase());
-        Preconditions.checkArgument(renameSchemaName.isPresent(), "The renamed schema is not exist of schema '%s'.", schemaName);
-        metaDataManagerPersistService.alterSchema(new AlterSchemaPOJO(database.getName(), sqlStatement.getSchemaName().getValue().toLowerCase(),
-                renameSchemaName.get(), logicDataSourceNames));
+        if (!renameSchemaName.isPresent()) {
+            return;
+        }
+        metaDataManagerPersistService.alterSchema(new AlterSchemaPOJO(database.getName(), sqlStatement.getSchemaName().getValue().toLowerCase(), renameSchemaName.get(), logicDataSourceNames));
     }
 
     @Override