8a5d49610d
### What changes were proposed in this pull request? The query plan of Spark SQL is a mutually recursive structure: QueryPlan -> Expression (PlanExpression) -> QueryPlan, but the transformations do not take this into account. This PR refines the comments of `QueryPlan` to highlight this fact. ### Why are the changes needed? better document. ### Does this PR introduce any user-facing change? no ### How was this patch tested? N/A Closes #28050 from cloud-fan/comment. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org> |
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