alamb commented on issue #10628:
URL: https://github.com/apache/datafusion/issues/10628#issuecomment-2129137066
Moving out of slack into Github so it might be more easily found
If your usecase is to to get the list of filters and tables that appear in a
query, one way to do this is:
* Get the list of tables by finding all `LogicalPlan::TableScan` (any Join
will have an input from a TableScan)
* Get the list of filters/predicates, look in `LogicalPlan::Filter` and
potentially the filters on the `LogicalPlan::TableScan`
So I think it could look something like (untested)
```rust
let mut referenced_tables = HashSet::new();
let mut filters = vec![];
// recursively visit all nodes in the tree (including subqueries)
logical_plan.apply_with_subqueries(|plan| {
match plan {
// record table names
LogicalPlan::TableScan(table_scan) => {
referenced_tables.insert(table_scan.table_name);
},
// record filters
LogicalPlan::Filter(filter) => {
filters.push(filter.predicate);
}
// ignore other nodes
_ => {}
Ok(TreeNodeRecursion::Continue)
}
})?;
```
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