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What kind of query optimizer does Hive use?

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Hive 0.14- is now powered by Apache Calcite. Calcite is an open source, enterprise-grade Cost-Based Logical Optimizer (CBO) and query execution framework. You need to set hive.cbo.enable configuration property to true, by default this property is false. When true, the cost based optimizer, which uses the Calcite ... read more

This example data set demonstrates Hive query language optimization. Tip 1: Partitioning Hive Tables Hive is a powerful tool to perform queries on large data sets and it is particularly good at queries that require full table scans. Yet many queries run on Hive have filtering where clauses limiting the data to be retrieved and processed, e.g. SELECT * WHERE state=’CA’. read more

A recent addition to Hive, Cost-based optimization, performs further optimizations based on query cost, resulting in potentially different decisions: how to order joins, which type of join to perform, degree of parallelism and others. read more

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