q977734161 opened a new pull request, #99:
URL: https://github.com/apache/iotdb-extras/pull/99

   ## Description
   I want to use STRING type data, but the current SINK does not support it.
   
   ### Why Use STRING type
   IoTDB version 1.3.X has added support for the STRING type. The difference 
between STRING and TEXT types is that STRING type carries more statistical 
information, which can be used to optimize value-filtering queries. TEXT type 
is more suitable for storing long strings.
   
   ##### Key changed/added classes (or packages if there are too many classes) 
in this PR
   DefaultIoTSerializationSchema.java -> serialize(Map<String, String> tuple)
   IoTDBSink.java ->  convertText(String device, List<String> measurements, 
List<Object> values)


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