xudong963 commented on PR #18386:
URL: https://github.com/apache/datafusion/pull/18386#issuecomment-3475710828
> Most of these file source implementations cannot operate without schema,
they all have `.expect("schema must be set")`s that violate using the language
to enforce correctness.
Can we set the schema for filesource at the FileScanConfigBuilder level?
```diff
diff --git a/datafusion/datasource/src/file_scan_config.rs
b/datafusion/datasource/src/file_scan_config.rs
index 5847a8cf5..660ba4615 100644
--- a/datafusion/datasource/src/file_scan_config.rs
+++ b/datafusion/datasource/src/file_scan_config.rs
@@ -290,10 +290,11 @@ impl FileScanConfigBuilder {
file_schema: SchemaRef,
file_source: Arc<dyn FileSource>,
) -> Self {
+ let table_schema =
TableSchema::from_file_schema(file_schema.clone());
Self {
object_store_url,
- table_schema: TableSchema::from_file_schema(file_schema),
- file_source,
+ table_schema: table_schema.clone(),
+ file_source: file_source.with_schema(table_schema),
file_groups: vec![],
statistics: None,
output_ordering: vec![],
```
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