Versions Compared

Old Version 8

changes.mady.by.user Lefty Leverenz

Saved on

compared with

New Version 9

changes.mady.by.user Lefty Leverenz

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.
Comment: mention wrong default for hive.auto.convert.join in hive-default.xml.template

...

The default value for hive.auto.convert.join was false in Hive 0.10.0.  Hive 0.11.0 changed the default to true (HIVE-3297). Note that hive-default.xml.template incorrectly gives the default as false in Hive 0.11.0 through 0.13.1.

MAPJOINs are processed by loading the smaller table into an in-memory hash map and matching keys with the larger table as they are streamed through. The prior implementation has this division of labor:

...