ALTER TABLE ADD COLUMN IF NOT grammar not supported by druid. add #smartAddColumn

Author: ed

src/test/java/io/github/gaoxingliang/dbupgrader/DbUpgradeExample.java

@@ -1,7 +1,6 @@
 package io.github.gaoxingliang.dbupgrader;
 
 import com.mysql.cj.jdbc.*;
-import io.github.gaoxingliang.dbupgrader.utils.*;
 import org.junit.jupiter.api.*;
 
 public class DbUpgradeExample {
@@ -14,7 +13,6 @@ public void test() throws Exception {
         dataSource.setUser("root");
         dataSource.setPassword("root123");
         dataSource.setConnectTimeout(3000);
-        SqlHelperUtils.smartAddColumn(dataSource.getConnection(), "alter table db_upgrade_history add column if not exists gmt_create timestamp default current_timestamp");
 
         // Configure the upgrade process
         UpgradeConfiguration configuration = UpgradeConfiguration.builder()