tableStructureCheckTask does not work properly

[sunsun314]

• dble version： 2.19.01.0/rel
• preconditions ：
  1.server.xml:

<property name="checkTableConsistency">1</property>
<property name="checkTableConsistencyPeriod">10000</property>

2. prepare table

create table test1(id int,name char(20));

• configs：
  schema.xml

    <schema name="TESTDB" sqlMaxLimit="100" dataNode="dn1">
    	  <table name="testxxx" dataNode="dn3"/>
        <table name="test1" dataNode="dn1,dn2,dn3,dn4" rule="hash-four"/>
    </schema>

• steps：

1. start dble with config

2.change test1 in one of the backend node in mysql

alter table test1 drop name;

3. check dble.log

• expect result：
  dble.log contain:

     + Table [" + tableName + "] structure are not consistent in different data node!
     + Table [" + tableMeta.getTableName() + "] are modified by other,Please Check IT!

• real result：
  dble.log contain:

    + Table [" + tableMeta.getTableName() + "] are modified by other,Please Check IT!

/label ~BUG