January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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Catalyst optimizer
One of the components that work with Spark structured API is Catalyst Optimizer. The aim of the catalyst optimizer is to provide performance benefits for structured APIs such as SQL, DataFrame, and dataset. The idea is that when you have schema information, you can optimize the query plan. For each query submitted by the user, it first gets converted to a Logical Query plan. This Logical Query plan has high-level information about the query in form of a tree of expressions and operations. Catalyst optimizer then performs a series of transformations on this logical plan to come up with the most efficient and Optimized Query plan. This optimized Logical Query plan is then converted to a physical query plan. The physical query ...
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