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Nick Dimiduk commented on SPARK-12957:
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Filed SPARK-19609. IMHO, it would be another subtask on this ticket.
> Derive and propagate data constrains in logical plan
> -----------------------------------------------------
>
> Key: SPARK-12957
> URL: https://issues.apache.org/jira/browse/SPARK-12957
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Yin Huai
> Assignee: Sameer Agarwal
> Attachments: ConstraintPropagationinSparkSQL.pdf
>
>
> Based on the semantic of a query plan, we can derive data constrains (e.g. if a filter
defines {{a > 10}}, we know that the output data of this filter satisfy the constrain of
{{a > 10}} and {{a is not null}}). We should build a framework to derive and propagate
constrains in the logical plan, which can help us to build more advanced optimizations.
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