[IMPALA-3026] Mark filters with "local only" to avoid sending to coordinator

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 2.5.0
• Fix Version/s: Impala 2.5.0
• Component/s: Distributed Exec
• Labels: runtime-filters
• Target Version: Impala 2.5.0
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 18/Feb/16 19:43
• Updated: 25/Feb/16 14:56
• Resolved: 25/Feb/16 14:56

Description

If a filter is

a) produced by a broadcast join and
b) applied by a scan in the same fragment

there is no need to send it to the coordinator. If the FE can identify these filters, the BE can do short-circuit application and not send it the coordinator.

This will interact with IMPALA-3024, as it will be important not to reduce the set of filter producers if the filter will only ever be short-circuited.