[IMPALA-7027] Multiple Cast to Varchar with different limit fails with "AnalysisException: null CAUSED BY: IllegalArgumentException: "

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0, Impala 2.9.0, Impala 2.10.0, Impala 2.11.0, Impala 3.0, Impala 2.12.0
• Fix Version/s: Impala 3.4.0
• Component/s: Frontend
• Labels: planner regression
• Target Version: Impala 2.13.0, Impala 3.4.0
• Epic Color: ghx-label-9
• Assignee: Yongzhi Chen
• Reporter: Meenakshi
• Created: 14/May/18 19:01
• Updated: 23/Aug/19 19:04
• Resolved: 23/Aug/19 19:04

Description

If we have multiple cast of '' to varchar statements in a impala query which has a distinct like below, the query breaks for scenario when the cast to varchar limit in the SQL is lower than the previous cast.

 

Query 1> Fails with " AnalysisException: null CAUSED BY: IllegalArgumentException: targetType=VARCHAR(100) type=VARCHAR(101)"

SELECT DISTINCT CAST('' as VARCHAR(101)) as CL_COMMENTS,CAST('' as VARCHAR(100))  as CL_USER_ID FROM tablename limit 1

Where as the below query succeeds

Query 2> Success

 SELECT DISTINCT CAST('' as VARCHAR(100)) as CL_COMMENTS,CAST('' as VARCHAR(101))  as CL_USER_ID FROM  tablename limit 1

Workaround
SET ENABLE_EXPR_REWRITES=false;

Issue Links

• relates to: IMPALA-7094 Fallback to an unoptimized query if ExprRewriter fails