clintropolis commented on issue #8733: Cell contains [LJava.lang.String@ instead of data when constructing array via transformSpec during ingestion URL: https://github.com/apache/incubator-druid/issues/8733#issuecomment-546099887 Thanks for the issue report. As you've run into, the work done so far in service of #7525 has not yet been fully completed and is not properly wired into the ingestion side through transformation expressions. Apologies for not calling this out in the release notes for 0.16, I will update them now to mention that ingestion side use of multi-value expressions will not function correctly, and try to see if I can get this implemented in time for 0.17. related #8613.
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