alamb commented on code in PR #8510:
URL: https://github.com/apache/arrow-datafusion/pull/8510#discussion_r1424637913
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datafusion/core/src/dataframe/mod.rs:
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@@ -1271,8 +1273,13 @@ impl DataFrame {
/// ```
pub async fn cache(self) -> Result<DataFrame> {
let context =
SessionContext::new_with_state(self.session_state.clone());
+ // type cast
Review Comment:
Rather than explcilty running (only) coercion (which is also run as part of
execution) I suggest you use the schema that comes directly from the output
stream
Something like (copied from `Self::collect`):
https://docs.rs/datafusion/latest/src/datafusion/dataframe/mod.rs.html#756-760
```
let task_ctx = Arc::new(self.task_ctx());
let plan = self.create_physical_plan().await?;
let schema = plan.schema();
collect(plan, task_ctx).await
```
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