This is the documentation for Cloudera Impala 1.4.1.
Documentation for other versions is available at Cloudera.com.

DISABLE_CODEGEN

This is a debug option, intended for diagnosing and working around issues that cause crashes. If a query fails with an "illegal instruction" or other hardware-specific message, try setting DISABLE_CODEGEN=true and running the query again. If the query succeeds only when the DISABLE_CODEGEN option is turned on, submit the problem to Cloudera support and include that detail in the problem report. Do not otherwise run with this setting turned on, because it results in lower overall performance.

Because the code generation phase adds a small amount of overhead for each query, you might turn on the DISABLE_CODEGEN option to achieve maximum throughput when running many short-lived queries against small tables.

Type: BOOLEAN

Default: false (shown as 0 in output of SET command)