[IMPALA-4309] Introduce expr rewrite phase.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.7.0
• Fix Version/s: Impala 2.8.0
• Component/s: Frontend
• Target Version: Impala 2.8.0
• Assignee: Alexander Behm
• Reporter: Alexander Behm
• Created: 18/Oct/16 05:15
• Updated: 03/Nov/16 21:09
• Resolved: 03/Nov/16 21:09

Description

To address issues like IMPALA-1286 we should introduce a new expr rewrite phase where analyzed exprs can be transformed with rules. The new phase could be similar to the subquery rewrite phase where we transform exprs in-place and then reset() and analyze() the whole statement again.

Issue Links

• blocks: IMPALA-1286 Pull out common conjuncts from disjunctions