[HIVE-13518] Hive on Tez: Shuffle joins do not choose the right 'big' table.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.1.0
• Component/s: Physical Optimizer, Tez
• Assignee: Vikram Dixit K
• Reporter: Vikram Dixit K
• Created: 14/Apr/16 18:35
• Updated: 27/Feb/24 22:23
• Resolved: 31/May/16 20:58

Description

Currently the big table is always assumed to be at position 0 but this isn't efficient for some queries as the big table at position 1 could have a lot more keys/skew. We already have a mechanism of choosing the big table that can be leveraged to make the right choice.