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[HIVE-20552] Get Schema from LogicalPlan faster - Hive - [issue]
...To get the schema of a query faster, it currently needs to compile, optimize, and generate a TezPlan, which creates extra overhead when only the LogicalPlan is needed.1. Copy the method Hive...    Author: Teddy Choi , 2018-10-04, 06:46
[HIVE-19584] Dictionary encoding for string types - Hive - [issue]
...Apache Arrow supports dictionary encoding for some data types. So implement dictionary encoding for string types in Arrow SerDe....    Author: Teddy Choi , 2018-09-29, 07:43
[HIVE-20150] TopNKey pushdown - Hive - [issue]
...TopNKey operator is implemented in HIVE-17896, but it needs more work in pushdown implementation. So this issue covers TopNKey pushdown implementation with proper tests....    Author: Teddy Choi , 2018-09-28, 21:37
[HIVE-20445] Add randomized tests to TestArrowColumnarBatchSerDe - Hive - [issue]
...Use random schemas/data for TestArrowColumnarBatchSerDe to improve coverage of arrow conversion/serialization....    Author: Teddy Choi , 2018-09-28, 15:27
[HIVE-20052] Arrow serde should fill ArrowColumnVector(Decimal) with the given schema precision/scale - Hive - [issue]
...Arrow serde should fill ArrowColumnVector with given precision and scale. When it serializes negative values into Arrow, it throws exceptions that the precision of the value is not same with...    Author: Teddy Choi , 2018-09-28, 02:26
[HIVE-20423] Set NULLS LAST as the default null ordering - Hive - [issue]
...HIVE-20150 TopNKeyOperator pushdown can be more efficient if NULLS LAST becomes the default null ordering....    Author: Teddy Choi , 2018-09-26, 09:13
[HIVE-20044] Arrow Serde should pad char values and handle empty strings correctly - Hive - [issue]
...When Arrow Serde serializes char values, it loses padding. Also when it counts empty strings, sometimes it makes a smaller number. It should pad char values and handle empty strings correctl...    Author: Teddy Choi , 2018-09-03, 05:37
[HIVE-20368] Remove VectorTopNKeyOperator lock - Hive - [issue]
...VectorTopNKeyOperator has a lock in line 199 as following.priorityQueue.offer(WritableUtils.clone(keysWritable, getConfiguration()));WritableUtils.clone calls Confgiruation.getClassByNameOrN...    Author: Teddy Choi , 2018-08-17, 21:12
[HIVE-20033] Backport HIVE-19432 to branch-2, branch-3 - Hive - [issue]
...Backport HIVE-19432 to branch-2, branch-3...    Author: Teddy Choi , 2018-08-14, 17:19
[HIVE-19723] Arrow serde: "Unsupported data type: Timestamp(NANOSECOND, null)" - Hive - [issue]
...Spark's Arrow support only provides Timestamp at MICROSECOND granularity. Spark 2.3.0 won't accept NANOSECOND. Switch it back to MICROSECOND.The unit test org.apache.hive.jdbc.TestJdbcWithMi...    Author: Teddy Choi , 2018-07-31, 01:33