Posts by Zhenhua Wang

This is a joint engineering effort between Databricks’ Apache Spark engineering team (Sameer Agarwal and Wenchen Fan) and Huawei’s engineering team (Ron Hu and Zhenhua Wang) Apache Spark 2.2 recently shipped with a state-of-art cost-based optimization framework that collects and leverages a variety of per-column data statistics (e.g., cardinality, number of distinct values, NULL values,...