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This change adds support for column lineage logging in Impala to be consumed by Navigator. This feature is disabled by default and is enabled by setting the -lineage_event_log_dir flag. When lineage logging is enabled, the serialized column lineage graph is computed for each query and stored in a specialized log file in JSON format. Change-Id: Ib8d69cdbcc435be1e9c9694998c1d33ec1245b10 Reviewed-on: http://gerrit.cloudera.org:8080/70 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com> Tested-by: Internal Jenkins