[GitHub] [incubator-iotdb] JulianFeinauer commented on pull request #1146: Added workaround when doing Aggregation over boolean Series.

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JulianFeinauer commented on pull request #1146:
URL: https://github.com/apache/incubator-iotdb/pull/1146#issuecomment-622821366


   Makes sense I guess. Will add that
   
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   ________________________________
   From: Xiangdong Huang <no...@github.com>
   Sent: Saturday, May 2, 2020 9:50:48 AM
   To: apache/incubator-iotdb <in...@noreply.github.com>
   Cc: Julian Feinauer <j....@pragmaticminds.de>; Author <au...@noreply.github.com>
   Subject: Re: [apache/incubator-iotdb] Added workaround when doing Aggregation over boolean Series. (#1146)
   
   
   @jixuan1989 commented on this pull request.
   
   ________________________________
   
   In grafana/src/main/java/org/apache/iotdb/web/grafana/dao/impl/BasicDaoImpl.java<https://github.com/apache/incubator-iotdb/pull/1146#discussion_r418927351>:
   
   >    @Override
      public List<TimeValues> querySeries(String s, Pair<ZonedDateTime, ZonedDateTime> timeRange) {
   +    try {
   +      return querySeriesInternal(s, timeRange, function);
   +    } catch (Exception e) {
   +      logger.info("Execution failed, trying now with FIRST Function!");
   +      // Try it with FIRST
   +      try {
   +        return querySeriesInternal(s, timeRange, "FIRST");
   +      } catch (Exception e2) {
   +        logger.warn("Even FIRST query did not succeed, returning NULL now", e2);
   +        return null;
   
   
   how about empty List?
   
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