Hive Vectorization in Big Data Hadoop

Vectorized query execution improves performance of operations like scans, aggregations, filters and joins, by performing them in batches of 1024 rows at once instead of single row each time.

Introduced in Hive 0.13, this feature significantly improves query execution time, and is easily enabled with two parameters settings:

set hive.vectorized.execution.enabled = true;

set hive.vectorized.execution.reduce.enabled = true;