title: when I'm using TDengine database ,after "alter table" , couldn't see the newest "describe table "
body: <p>after I execute &quot;alter table t1 add column num1 int&quot; in TDengine database server-side
  .</p>
  <p>but int the TDengine client side,I couldn't see the newest table schema with column &quot;num1&quot;</p>
  <p>may I know why</p>
  <p>I'm using TDenginw 2.2.1.0</p>