[
https://issues.apache.org/jira/browse/HIVE-24839?focusedWorklogId=559936&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-559936
]
ASF GitHub Bot logged work on HIVE-24839:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 02/Mar/21 13:00
Start Date: 02/Mar/21 13:00
Worklog Time Spent: 10m
Work Description: ujc714 opened a new pull request #2034:
URL: https://github.com/apache/hive/pull/2034
### What changes were proposed in this pull request?
It fixes a bug in UDFSubstr.SubStrStatEstimator.
### Why are the changes needed?
The method getRangeWidth didn't check if range is null before it references
the properties of range. When Hive estimates the stats on a substr function
with a child UDF, the compilation might fail due to NullPointerException.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Start MiniHS2Cluster then run the following queries manually:
```
create table t0 (s string);
create table t1 (s string, i int);
insert into t0 select "abc";
insert into t1 select "abc", 4;
select substr(t0.s, t1.i-1) from t0 join t1 on t0.s=t1.s;
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 559936)
Remaining Estimate: 0h
Time Spent: 10m
> SubStrStatEstimator.estimate throws NullPointerException
> --------------------------------------------------------
>
> Key: HIVE-24839
> URL: https://issues.apache.org/jira/browse/HIVE-24839
> Project: Hive
> Issue Type: Bug
> Reporter: Robbie Zhang
> Assignee: Robbie Zhang
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This issue can be reproduced by running the following queries:
> {code:java}
> create table t0 (s string);
> create table t1 (s string, i int);
> insert into t0 select "abc";
> insert into t1 select "abc", 4;
> select substr(t0.s, t1.i-1) from t0 join t1 on t0.s=t1.s;
> {code}
> The select query fails with error:
> {code:java}
> Error: Error while compiling statement: FAILED: NullPointerException null
> (state=42000,code=40000)
> {code}
>
>
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