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[HIVE-21742] Vectorization: CASE result type casting - Hive - [issue]
...create temporary table foo(q548284 int);insert into foo values(1),(2),(3),(4),(5),(6);select q548284, CASE WHEN ((q548284 = 1)) THEN (0.2) WHEN ((q548284 = 2)) THEN (0.4) WHEN ((q548284 = 3)...    Author: Gopal V , 2019-06-11, 21:16
[HIVE-21805] HiveServer2: Use the fast ShutdownHookManager APIs - Hive - [issue]
...Hadoop ShutDownHookManager calls "new Configuration()" inside if the parameters are not provided as args.This unzips jars & looks for the .xml files in the entire classpath.  + ...    Author: Gopal V , 2019-06-08, 04:24
[HIVE-21818] CBO: Copying TableRelOptHiveTable has metastore traffic - Hive - [issue]
...While the optimizer is running, whenever it makes a copy of the TableScan to perform potential rewrites, there is Hive metastore traffic from inside CBO optimizer.  public RelOptHiveTab...    Author: Gopal V , 2019-06-07, 18:20
[HIVE-21800] Tez: Cartesian product reparses HiveConf XML - Hive - [issue]
...      CartesianProductConfig cpConfig = new CartesianProductConfig(crossProductSources);      edgeManagerDescriptor.setUserPayload(cpConfig.toUserPayload(new Te...    Author: Gopal V , 2019-06-04, 22:25
[TEZ-4073] Configuration: Reduce Vertex and DAG Payload Size - Tez - [issue]
...As the total number of vertices go up, the Tez protobuf transport starts to show up as a potential scalability problem for the task submission and the AMpublic TezTaskRunner2(Configuration t...    Author: Gopal V , 2019-06-01, 06:13
[HIVE-18920] CBO: Initialize the Janino providers ahead of 1st query - Hive - [issue]
...Hive Calcite metadata providers are compiled when the 1st query comes in.If a second query arrives before the 1st one has built a metadata provider, it will also try to do the same thing, be...    Author: Gopal V , 2019-05-30, 23:23
[HIVE-21768] JDBC: Strip the default union prefix for un-enclosed UNION queries - Hive - [issue]
...beeline> select 1  union all select 2;+----------+| _u1._c0  |+----------+| 2        || 1        |+----------+The _u1 is superfluous and ...    Author: Gopal V , 2019-05-28, 22:08
[HIVE-21646] Tez: Prevent TezTasks from escaping thread logging context - Hive - [issue]
...If hive.exec.parallel is set to true to parallelize MoveTasks or StatsTasks, the Tez task does not benefit from a new thread and will lose all the thread context of the current query.Multipl...    Author: Gopal V , 2019-05-24, 06:23
[HIVE-21781] Optimizer: Constant folding without CBO skips the aggregates - Hive - [issue]
...create temporary table foo (x int) ;insert into foo values(1),(2),(3),(4),(5);set hive.explain.user=false;explain vectorization detail select count(case when (x=1 or false) then 1 else 0 end...    Author: Gopal V , 2019-05-23, 04:58
[HIVE-21779] ACID: Delete deltas should not project the row struct - Hive - [issue]
...        if (useDecimal64ColumnVector) {          this.batch = deleteDeltaReader.getSchema().createRowBatchV2();        } else...    Author: Gopal V , 2019-05-22, 16:51