Spark SQL Catalyst Code Optimization using Function Outlining with Madhusudanan Kandasamy IBM
Spark SQL Catalyst optimizer, post query plan optimization, compiles the SQL query to Java code. Without code generation, such query expressions would have to be interpreted for each row of data, by walking down a tree of nodes. This introduces large amounts of branches and virtual function calls that slow down execution. With code generation, a query is collapsed into a single optimized function that eliminates multiple function calls and leverages CPU registers for intermediate data.
This code is then compiled in runtime to Java bytecode using Janino compiler. This presentation focuses on further catalyst code generation optimizations possible using function outlining. Automatic code generation tools generally tend to generate huge optimized functions. Large functions that are frequently executed might degrade runtime performance by preventing JVM optimizations such as function inlining. To avoid this, code generation tools should try to contain independent logic into separate functions.
This presentation will take the audience through the Spark Catalyst Code generation, how automatic split of large functions into smaller functions was achieved and the performance benefits associated with it.
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