HIVE-29745: Remove Druid integration#6615
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Remove the Druid storage handler and all associated infrastructure from the codebase since its broken and no longer used. Changes include: - Delete the druid-handler module (storage handler, SerDe, I/O formats, Kafka ingestion support, Kerberos security utilities) - Delete the itests/qtest-druid module (MiniDruidCluster, test drivers) - Remove all Druid-related query test files (.q and .q.out) - Remove hive.druid.* configuration variables from HiveConf - Remove Druid constants and calcite-druid dependency - Remove Calcite optimizer rules: HiveDruidRules, DruidSqlOperatorConverter, SortedDynPartitionTimeGranularityOptimizer - Remove DruidQuery handling from CalcitePlanner, HiveVolcanoPlanner, HiveFilterProjectTransposeRule, HiveRelFieldTrimmer, ASTBuilder, ASTConverter, and HiveMaterializedViewsRegistry - Remove DRUID/DRUID_LOCAL/DRUID_KAFKA cluster types from test infra - Relocate Kafka test utilities (SingleNodeKafkaCluster, Wikipedia) from itests/qtest-druid to itests/util under org.apache.hadoop.hive.kafka - Update itests/util dependencies to use kafka artifacts directly instead of pulling them transitively via hive-it-druid
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simhadri-g
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Jul 17, 2026
simhadri-g
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This is great, Thanks @zabetak !
I have done the same once before back in 2022 and this change looks good to me.
+1 LGTM pending tests!
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There are few files which still reference "druid"
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What changes were proposed in this pull request?
Why are the changes needed?
The Druid integration is broken for the past 5 years and seemingly unused.
Does this PR introduce any user-facing change?
No really, in the sense that Druid integration is already broken in the past few releases.
How was this patch tested?
Existing tests