alamb commented on code in PR #16750:
URL: https://github.com/apache/datafusion/pull/16750#discussion_r2202549466
##########
datafusion/catalog/src/default_table_source.rs:
##########
@@ -45,6 +45,26 @@ impl DefaultTableSource {
pub fn new(table_provider: Arc<dyn TableProvider>) -> Self {
Self { table_provider }
}
+
+ /// Attempt to downcast a TableSource to DefaultTableSource and access the
+ /// TableProvider. This will only work with a TableSource created by
DataFusion.
Review Comment:
I don't understand why we need this method when we already have
`source_as_provider`.
If we do need the method, I think it would help to give some more context /
pointers on how to use it and why it is different than the `souce_as_provider`
```suggestion
/// TableProvider. This will only work with a TableSource created by
[`provider_as_source`]
///
/// This is commonly used to downcast the result of
[`provider_as_source`] back to the TableProvider.
```
Bonus points if we could figure out how to do an doc example showing how to
use `unwrap_provider` on the output of `provider_as_source` (though I think
the setup would be pretty tough)
##########
datafusion/proto/src/logical_plan/mod.rs:
##########
@@ -117,18 +117,18 @@ pub trait LogicalExtensionCodec: Debug + Send + Sync {
fn try_encode(&self, node: &Extension, buf: &mut Vec<u8>) -> Result<()>;
- fn try_decode_table_provider(
+ fn try_decode_table_source(
Review Comment:
it makes sense to me to have the logical plan serialization be in terms of a
TableSource (the logical part) rather than a Table Provider
https://docs.rs/datafusion/latest/datafusion/logical_expr/trait.TableSource.html
I realize there are no existing docs on this method, but given we are
changing it I think it would be helpful if we added some hints for other readers
Something like
```suggestion
/// Attempts to decode a [`TableSource`]
///
/// Note that the default codec will serialize [`TableProvider`] as a
[`DefaultTableProvider`]
/// you can use [`DefaultTableSource::unwrap_provider`] to recover the
original `TableProvider`.
fn try_decode_table_source(
```
##########
datafusion/catalog/src/default_table_source.rs:
##########
@@ -87,7 +107,7 @@ impl TableSource for DefaultTableSource {
}
}
-/// Wrap TableProvider in TableSource
+/// Wrap a TableProvider as a TableSource.
Review Comment:
```suggestion
/// Wrap a TableProvider as a TableSource.
///
/// See [`source_as_provider`] to retrieve the original
/// TableSource.
```
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