Performance utilities

HQL provides the EXPLAIN and ANALYZE statements, which can be used as utilities to check and identify the performance of queries. In addition, Hive logs contain enough detailed information for performance investigation and troubleshooting.

EXPLAIN statement

Hive provides an EXPLAIN statement to return a query execution plan without running the query. We can use it to analyze queries if we have concerns about their performance. The EXPLAIN statement helps us to see the difference between two or more queries for the same purpose. The syntax for it is as follows:

EXPLAIN [FORMATTED|EXTENDED|DEPENDENCY|AUTHORIZATION] hql_query

The following keywords can be used:

• FORMATTED: This provides a formatted JSON...