[Bug] [Connector-V2] Sync TDEngine to Doris，Doesn't support TDENGINE type 'NCHAR' yet.

[HelloJack0]

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What happened

Sync TDEngine to Doris，Error：Doesn't support TDENGINE type 'NCHAR' yet.

SeaTunnel Version

SeaTunnel Version
2.3.8

SeaTunnel Config

env {
    parallelism = 1
    job.mode = "STREAMING"
    checkpoint.interval = 60000
}

source {
    TDengine {
        url : "jdbc:TAOS-RS://192.168.1.239:6041/"
        username : "it"
        password : "123456"
        database : "TEST_cloud"
        stable : "sys_coldata"
        lower_bound : "2024-01-03 10:38:05.000"
        upper_bound : "2024-12-30 15:00:00.800"
        plugin_output = "tdengine_result"
    }

}

sink {
    Doris {
        fenodes = "192.168.1.91:8030"
        username = root
        password = ${DORIS_ROOT_PWD}
        database = TEST
        table = "${table_name}_cloud"
        sink.label-prefix = "cloud"
        sink.enable-2pc = "false"
        sink.enable-delete = "true"
        doris.config {
            format = "json"
            read_json_by_line = "true"
        }
    }
}

Running Command

./bin/seatunnel.sh --config job/td-jdbc-doris --async -n td-test

Error Exception

Exception in thread "main" org.apache.seatunnel.core.starter.exception.CommandExecuteException: SeaTunnel job executed failed
        at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:213)
        at org.apache.seatunnel.core.starter.SeaTunnel.run(SeaTunnel.java:40)
        at org.apache.seatunnel.core.starter.seatunnel.SeaTunnelClient.main(SeaTunnelClient.java:34)
Caused by: org.apache.seatunnel.connectors.seatunnel.tdengine.exception.TDengineConnectorException: ErrorCode:[COMMON-07], ErrorDescription:[Unsupported data type] - Doesn't support TDENGINE type 'NCHAR' yet.
        at org.apache.seatunnel.connectors.seatunnel.tdengine.typemapper.TDengineTypeMapper.mapping(TDengineTypeMapper.java:150)
        at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSource.getStableMetadata(TDengineSource.java:156)
        at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSource.prepare(TDengineSource.java:93)
        at org.apache.seatunnel.engine.core.parse.JobConfigParser.parseSource(JobConfigParser.java:83)
        at org.apache.seatunnel.engine.core.parse.MultipleTableJobConfigParser.parseSource(MultipleTableJobConfigParser.java:370)
        at org.apache.seatunnel.engine.core.parse.MultipleTableJobConfigParser.parse(MultipleTableJobConfigParser.java:209)
        at org.apache.seatunnel.engine.client.job.ClientJobExecutionEnvironment.getLogicalDag(ClientJobExecutionEnvironment.java:114)
        at org.apache.seatunnel.engine.client.job.ClientJobExecutionEnvironment.execute(ClientJobExecutionEnvironment.java:182)
        at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:160)
        ... 2 more

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