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https://issues.apache.org/jira/browse/SPARK-23203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16338063#comment-16338063
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Marcelo Vanzin commented on SPARK-23203:
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[~rdblue] is this something that affects the API or is it just an internal
change? (Or, in other words, "should it block 2.3"?)
> DataSourceV2 should use immutable trees.
> ----------------------------------------
>
> Key: SPARK-23203
> URL: https://issues.apache.org/jira/browse/SPARK-23203
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Ryan Blue
> Priority: Major
>
> The DataSourceV2 integration doesn't use [immutable
> trees|https://databricks.com/blog/2015/04/13/deep-dive-into-spark-sqls-catalyst-optimizer.html],
> which is a basic requirement of Catalyst. The v2 relation should not wrap a
> mutable reader and change the logical plan by pushing projections and filters.
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