andygrove commented on code in PR #3732:
URL: https://github.com/apache/arrow-datafusion/pull/3732#discussion_r989513752
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datafusion/optimizer/src/decorrelate_where_exists.rs:
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@@ -137,8 +137,14 @@ fn optimize_exists(
let subqry_inputs = query_info.query.subquery.inputs();
let subqry_input = only_or_err(subqry_inputs.as_slice())
.map_err(|e| context!("single expression projection required", e))?;
- let subqry_filter = Filter::try_from_plan(subqry_input)
- .map_err(|e| context!("cannot optimize non-correlated subquery", e))?;
+ let subqry_filter = match subqry_input {
Review Comment:
I have been looking at this as well. The existing code works for a very
simple projection but does not work if the projection is wrapped in any other
operator, such as Distinct, Filter, Limit, Sort, and so on.
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