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https://issues.apache.org/jira/browse/IMPALA-11462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17615743#comment-17615743
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Daniel Becker commented on IMPALA-11462:
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If both operands are literals, expression rewrite will execute the shift
operation and replace the expression with literal 128.
If the second operand is not a literal, the expression cannot be evaluated by
the rewriter. On the other hand, the cast to bigint will be folded into the
literal during expression rewrite. This modifies the expression, so re-analysis
is needed. Re-analysis resets the literal expression (a NumericLiteral), which
loses its type and becomes TINYINT again.
The problem is that when FoldConstantsRule folds the cast into the literal, it
doesn't set its explicit type, and only its implicit type becomes BIGINT (for
the various types of NumericLiterals, see
[https://github.com/apache/impala/blob/11157a87016fc2408a5ae649aed7cdfb8a0e5d3b/fe/src/main/java/org/apache/impala/analysis/NumericLiteral.java#L41).]
In the case where expression rewrite is disabled, no re-analysis takes place so
the literal and its type are not reset.
The solution is to set the explicit type of NumericLiteral when folding the
cast into it.
> 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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