[IMPALA-1464] Bug in explain plan: Plan nodes in unpartitioned fragments should have hosts=1.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.0
• Fix Version/s: Impala 2.9.0
• Component/s: Frontend
• Labels: planner ramp-up
• Target Version: Product Backlog
• Assignee: Tim Armstrong
• Reporter: Alexander Behm
• Created: 11/Nov/14 02:55
• Updated: 13/Jun/17 15:39
• Resolved: 13/Jun/17 15:39

Description

Query: explain select * from functional.alltypes limit 10
+-----------------------------------------------------------+
| Explain String                                            |
+-----------------------------------------------------------+
| Estimated Per-Host Requirements: Memory=160.00MB VCores=1 |
|                                                           |
| 01:EXCHANGE [UNPARTITIONED]                               |
| |  limit: 10                                              |
| |  hosts=3 per-host-mem=unavailable                       | <-- should be hosts=1
| |  tuple-ids=0 row-size=97B cardinality=10                |
| |                                                         |
| 00:SCAN HDFS [functional.alltypes, RANDOM]                |
|    partitions=24/24 files=24 size=478.45KB                |
|    table stats: 7300 rows total                           |
|    column stats: all                                      |
|    limit: 10                                              |
|    hosts=3 per-host-mem=160.00MB                          |
|    tuple-ids=0 row-size=97B cardinality=10                |
+-----------------------------------------------------------+