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https://issues.apache.org/jira/browse/SPARK-30893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17041617#comment-17041617
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L. C. Hsieh commented on SPARK-30893:
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hmm, an action like `df.collect` should re-evaluate if it is not cached, right?
If so, changing a config causing the results different sounds reasonable too?
Although I agree that it is error-prone in practice. We should avoid
inconsistency among different SQL configs, for example some configs can change
behaviors across `df.collect` calls but some are not. If there is a consistent
rule about whether SQL configs can change behaviors across different calls of
same action, it is better.
> Expressions should not change its data type/behavior after it's created
> -----------------------------------------------------------------------
>
> Key: SPARK-30893
> URL: https://issues.apache.org/jira/browse/SPARK-30893
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Wenchen Fan
> Priority: Critical
>
> This is a problem because the configuration can change between different
> phases of planning, and this can silently break a query plan which can lead
> to crashes or data corruption.
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