[IMPALA-5698] Predicates with constant folded exprs don't get pushed to Kudu scans

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Product Backlog
• Component/s: Frontend
• Labels: kudu
• Epic Color: ghx-label-3
• Assignee: Unassigned
• Reporter: Matthew Jacobs
• Created: 23/Jul/17 18:06
• Updated: 21/Aug/17 19:43
• Resolved: 19/Aug/17 16:48

Description

Predicates with expressions that get constant folded don't get pushed to Kudu scans even though they could be. E.g.:

[localhost:21000] > explain select * from functional_kudu.alltypestiny where bigint_col < 1000 / 100;
Query: explain select * from functional_kudu.alltypestiny where bigint_col < 1000 / 100
+---------------------------------------------+
| Explain String                              |
+---------------------------------------------+
| Per-Host Resource Reservation: Memory=0B    |
| Per-Host Resource Estimates: Memory=10.00MB |
| Codegen disabled by planner                 |
|                                             |
| PLAN-ROOT SINK                              |
| |                                           |
| 00:SCAN KUDU [functional_kudu.alltypestiny] |
|    predicates: bigint_col < 10              |
+---------------------------------------------+
Fetched 8 row(s) in 0.08s
[localhost:21000] > explain select * from functional_kudu.alltypestiny where bigint_col < 10;
Query: explain select * from functional_kudu.alltypestiny where bigint_col < 10
+---------------------------------------------+
| Explain String                              |
+---------------------------------------------+
| Per-Host Resource Reservation: Memory=0B    |
| Per-Host Resource Estimates: Memory=10.00MB |
| Codegen disabled by planner                 |
|                                             |
| PLAN-ROOT SINK                              |
| |                                           |
| 00:SCAN KUDU [functional_kudu.alltypestiny] |
|    kudu predicates: bigint_col < 10         |
+---------------------------------------------+
Fetched 8 row(s) in 0.05s