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Support SubqueryAlias wrap filter. #4013

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jackwener wants to merge 2 commits into from
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Support SubqueryAlias wrap filter. #4013

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Support SubqueryAlias wrap filter.
jackwener Oct 29, 2022
940ef73
polish Err
jackwener Oct 29, 2022
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5 changes: 4 additions & 1 deletion datafusion/core/src/physical_plan/planner.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1013,7 +1013,10 @@ impl DefaultPhysicalPlanner {
LogicalPlan::TableScan(..) => {
self.create_initial_plan(input, session_state).await
}
_ => Err(DataFusionError::Plan("SubqueryAlias should only wrap TableScan".to_string()))
LogicalPlan::Filter(..) => {
self.create_initial_plan(input, session_state).await
}
_ => Err(DataFusionError::Plan("SubqueryAlias should only wrap TableScan or Filter".to_string()))

@Dandandan Dandandan Oct 29, 2022

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Ideally we should be able to support wrapping any plan in a subquery with alias (this could also simplify some planning code).
But I got some errors trying this before.
#3927

@jackwener jackwener Oct 29, 2022 •
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I may get your point. You hope to unify alias in the same place
Current, alias can exist two part.

  • SubqueryAlias
  • Projection Alias
    This implementation is different from Spark

Spark Subquery don't include alias.

case class Subquery(child: LogicalPlan, correlated: Boolean) extends OrderPreservingUnaryNode {
  override def output: Seq[Attribute] = child.output
  override protected def withNewChildInternal(newChild: LogicalPlan): Subquery =
    copy(child = newChild)
}

I think your thought is reasonable. We shouldn't put alias in multiple place.

We have two choices:

  • Just SubqueryAlias can contains alias
  • like spark, Subquery don't contain alias

I also agree with former, which is more suitable for the current situation of datafusion

@jackwener jackwener Oct 29, 2022

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This PR is just a tmp solution for #4014.

When I try to fix Integrations test, I add these code to fix it.

}
}
LogicalPlan::Limit(Limit { input, skip, fetch, .. }) => {
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