林木88

In the previous blog post, I covered the rules included in the “Eliminate Distinct“, “Finish Analysi

Spark SQL Catalyst provides a rule-based optimizer to optimise the resolved logical plan before feed

After the SparkSQLParser parses a SQL query text into an ANTLR tree and then into a logical plan, th

As mentioned in the last blog post, a Spark Catalyst query plan is internally represented as a tree,

Spark SQL Query Engine Deep Dive (1) – Catalyst QueryExecution Overview