z1q1q7 opened a new issue #7891: Can't export bitmaps URL: https://github.com/apache/incubator-druid/issues/7891 use **dump-segment** to dump rows and metadata are ok, but not bitmaps. ### Affected Version 0.14.0 ### Description java -classpath "lib/*" org.apache.druid.cli.Main tools dump-segment --directory `pwd` --out /tmp/out.txt --dump bitmaps ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. Jun 14, 2019 11:00:21 AM org.hibernate.validator.internal.util.Version <clinit> INFO: HV000001: Hibernate Validator 5.1.3.Final Exception in thread "main" java.lang.RuntimeException: com.fasterxml.jackson.core.JsonGenerationException: Can not write a binary value, expecting field name at com.google.common.base.Throwables.propagate(Throwables.java:160) at org.apache.druid.cli.DumpSegment$3.apply(DumpSegment.java:392) at org.apache.druid.cli.DumpSegment$3.apply(DumpSegment.java:343) at org.apache.druid.cli.DumpSegment.withOutputStream(DumpSegment.java:428) at org.apache.druid.cli.DumpSegment.runBitmaps(DumpSegment.java:341) at org.apache.druid.cli.DumpSegment.run(DumpSegment.java:191) at org.apache.druid.cli.Main.main(Main.java:118) refer to **dump-segment** doc, column can omit, however, whether i pass column or not, i get **Can not write a binary value, expecting field name** error.
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