alamb commented on code in PR #10716:
URL: https://github.com/apache/datafusion/pull/10716#discussion_r1619577420
##########
datafusion/core/src/datasource/schema_adapter.rs:
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@@ -75,9 +75,16 @@ pub trait SchemaAdapter: Send + Sync {
/// Creates a `SchemaMapping` that can be used to cast or map the columns
/// from the file schema to the table schema.
-pub trait SchemaMapper: Send + Sync {
+pub trait SchemaMapper: Debug + Send + Sync {
/// Adapts a `RecordBatch` to match the `table_schema` using the stored
mapping and conversions.
fn map_batch(&self, batch: RecordBatch) ->
datafusion_common::Result<RecordBatch>;
+
+ /// Adapts a `RecordBatch` that does not have all the columns (as defined
in the schema).
Review Comment:
I don't fully understand the need for this function (maybe it would be
better to modify the schema `file_schema` to have the columns that are needed 🤔
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