How to obtain Map Reduce code from Hive Query?

Question

Hive如何为每个查询自动生成Map Reduce代码，是否可以查看Hive为每个查询生成的Map Reduce代码？

Answer 1

Hive does not generate Map reduce code rather it uses different type of operators like Map Operator, Reduce Operator , Join Operator, Limit Operator...... It uses the corresponding operators based on plan generated from our SQL.

The code for operators can be found in JAR hive-exec.jar Here is the repository link for the code http://svn.apache.org/viewvc/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/