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https://issues.apache.org/jira/browse/IMPALA-11462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17615736#comment-17615736
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Daniel Becker commented on IMPALA-11462:
----------------------------------------
Steps to reproduce:
With literal second argument the query works as expected:
{code:java}
select shiftleft(cast(1 as bigint), 7);
+---------------------------------+
| shiftleft(cast(1 as bigint), 7) |
+---------------------------------+
| 128 |
+---------------------------------+{code}
With non-literal second argument overflow occurs:
{code:java}
select shiftleft(cast(1 as bigint), z) c from (select 7 z ) x;
+------+
| c |
+------+
| -128 |
+------+{code}
However, if we disable expression rewriting, it works with a non-literal second
argument, too:
{code:java}
set ENABLE_EXPR_REWRITES=0;
select shiftleft(cast(1 as bigint), z) c from (select 7 z ) x;
+-----+
| c |
+-----+
| 128 |
+-----+{code}
> shiftleft problem
> -----------------
>
> Key: IMPALA-11462
> URL: https://issues.apache.org/jira/browse/IMPALA-11462
> Project: IMPALA
> Issue Type: Bug
> Components: Clients
> Affects Versions: Impala 3.4.1
> Reporter: jack sun
> Assignee: Daniel Becker
> Priority: Minor
> Attachments: screenshot-1.png
>
>
> if change the second param of function 'shiftleft' as a dynamic value , it
> will change the first param as tinnyint
> !screenshot-1.png!
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