[IMPALA-4432] Cannot execute IR UDF when single node execution is enabled

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.8.0
• Component/s: Backend
• Target Version: Impala 2.8.0
• Assignee: Michael Ho
• Reporter: Tim Armstrong
• Created: 04/Nov/16 19:12
• Updated: 27/Jan/17 18:18
• Resolved: 22/Nov/16 19:09

Description

There is a bad interaction between the single-node execution optimisation and IR UDFs. The optimisation overrides the disable_codegen query option, which prevents the UDF from running:

[tarmstrong-box.ca.cloudera.com:21000] > set disable_codegen=0;
DISABLE_CODEGEN set to 0
[tarmstrong-box.ca.cloudera.com:21000] > set EXEC_SINGLE_NODE_ROWS_THRESHOLD=100;
EXEC_SINGLE_NODE_ROWS_THRESHOLD set to 100
[tarmstrong-box.ca.cloudera.com:21000] > select twenty_one_args(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21);
Query: select twenty_one_args(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21)
Query submitted at: 2016-11-04 12:10:49 (Coordinator: http://tarmstrong-box:25000)
ERROR: Cannot interpret native UDF 'twenty_one_args': number of arguments is more than 20. Codegen is needed. Please set DISABLE_CODEGEN to false.

Issue Links

• is related to: IMPALA-4233 Revisit handling of expr codegen failures