TiDB dataX 任务执行问题

[baisui1981]

存在两个问题：

1. 解析TiDB列的metadata 有问题，例如在执行TiDB->StarRocks流程中
   映射生成的DDL脚本：

  CREATE TABLE table1
(
    `id`     VARCHAR(-1) NOT NULL,
    `id1`    VARCHAR(-1),
    `id2`    VARCHAR(-1),
    `id3`    VARCHAR(-1),
    `id4`    VARCHAR(-1),
    `id5`    VARCHAR(-1),
    `id6`    VARCHAR(-1),
    `id7`    VARCHAR(-1),
    `id8`    DATE,
    `id9`    VARCHAR(-1),
    `id10`   DECIMAL(-1,0),
    `id11`   VARCHAR(-1),
    `id12`   BIGINT,
    `id13`   BIGINT,
    `id14`   BIGINT,

varchar 的scala length 丢失了

2. 执行过程中，如果TiDB中为null值则会 抛出异常

2021-12-27 23:13:30 INFO member com.pingcap.tikv.PDClient- Switched to new leader: [leaderInfo: 10.5.8.232:2379]
2021-12-27 23:13:30 ERROR member c.a.d.c.s.p.t.StdoutPluginCollector-
java.lang.NumberFormatException: null
        at java.lang.Long.parseLong(Long.java:552) ~[na:1.8.0_311]
        at java.lang.Long.parseLong(Long.java:631) ~[na:1.8.0_311]
        at com.qlangtech.tis.plugin.datax.TisDataXTiDBReader$Task.createCol(TisDataXTiDBReader.java:182) ~[tis-ds-tidb-plugin.jar:3.2.0]
        at com.qlangtech.tis.plugin.datax.TisDataXTiDBReader$Task.startRead(TisDataXTiDBReader.java:152) ~[tis-ds-tidb-plugin.jar:3.2.0]
        at com.alibaba.datax.core.taskgroup.runner.ReaderRunner.run(ReaderRunner.java:57) [datax-core-3.2.0.jar:na]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_311]

[baisui1981]

v3.3.0中已经发布