[IMPALA-10816] 'NoneType' object is not iterable exception when query returns more than 10.000 rows

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: Impala 4.0.0
• Assignee: Unassigned
• Reporter: Alexandra Dunai
• Created: 21/Jul/21 08:20
• Updated: 25/Aug/21 15:13

Description

Impala-shell returns 'NoneType' object is not iterable exception when query returns more than 10.000 rows.

Steps to reproduce:
1. Enter impala-shell (or you can run query from a file as well)
2. Run a query that returns more than 10.000 rows (e.g. 10.001 rows)

Expected result:

Impala-shell returns all rows that were queried.

Actual result:
Impala-shell throws exception for 'NoneType' object is not iterable and then disconnects. You can only continue using impala-shell if you reconnect to it.

Issue Links

• is broken by: THRIFT-3175 fastbinary.c python deserialize can cause huge allocations from garbage
• is fixed by: THRIFT-3532 Add configurable string and container read size limit to Python protocols