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* Added SystemSchema with following tables (#5989) * SEGMENTS table provides details on served and published segments * SERVERS table provides details on data servers * SERVERSEGMETS table is the JOIN of SEGMENTS and SERVERS * TASKS table provides details on tasks * Add documentation for system schema * Fix static-analysis warnings * Address PR comments *Add unit tests * Fix a test * Try to fix a test * Fix a bug around replica count * rename io.druid to org.apache.druid * Major change is to make tasks and segment queries streaming * Made tasks/segments stream to calcite instead of storing it in memory * Add num_rows to segments table * Refactor JsonParserIterator * Replace with closeable iterator * Fix docs, make num_rows column nullable, some unit test changes * make num_rows column type long, allow it to be null fix a compile error after merge, add TrafficCop param to InputStreamResponseHandler * Filter null rows for segments table from Linq4j enumerable * change num_replicas datatype to long in segments table * Fix some tests and address comments * Doc updates, other PR comments * Update tests * Address comments * Add auth check * Update docs * Refactoring * Fix teamcity warning, change the getQueryableServer in TimelineServerView * Fix compilation after rebase * Use the stream API from AuthorizationUtils * Added LeaderClient interface and NoopDruidLeaderClient class * Revert "Added LeaderClient interface and NoopDruidLeaderClient class" This reverts commit 100fa46e396ab0f68da6c4bef80951f6b996657e. * Make the naming consistent to server_segments for the join table * Add ForbiddenException on auth check failure * Remove static block from SystemSchema * Try to fix a test in CalciteQueryTest due to rename of server_segments * Fix the json output format in the coordinator API * Add auth check in the segments API * Add null check to avoid NPE * Use annonymous class object instead of mock for DruidLeaderClient in SqlBenchmark * Fix test failures, type long/BIGINT can be nullable * Revert long nullability to fix tests * Fix style for tests * PR comments * Address PR comments * Add the missing BytesAccumulatingResponseHandler class * Use Sequences.withBaggage in DruidPlanner * Fix docs, add comments * Close the iterator if hasNext returns false