private static boolean isDate(String s) {
    return s.equalsIgnoreCase(Constants.DATATYPE_DATE);
  }
if data type of timeseries is not defined in headers of schema, this method will be called to
do type inference

@param strValue
@return
iotdb-client/cli/src/main/java/org/apache/iotdb/tool/data/AbstractDataTool.java