Dandandan commented on a change in pull request #2000:
URL: https://github.com/apache/arrow-datafusion/pull/2000#discussion_r833691608
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File path: datafusion/src/physical_plan/file_format/mod.rs
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@@ -293,6 +293,34 @@ impl PartitionColumnProjector {
}
}
+ // Creates a RecordBatch with values from the partition_values. Used when
no non-partition values are read
+ fn project_empty(
+ &mut self,
+ batch_size: usize,
+ partition_values: &[ScalarValue],
+ ) -> ArrowResult<RecordBatch> {
+ let expected_cols = self.projected_schema.fields().len();
+ if expected_cols != self.projected_partition_indexes.len() {
+ return Err(ArrowError::SchemaError(format!(
+ "Unexepected number of partition values, expected {} but got
{}",
+ expected_cols,
+ partition_values.len()
+ )));
+ }
+ let mut cols = Vec::with_capacity(partition_values.len());
Review comment:
Small style suggestion: I think we can rewrite this to use `.collect()`
on an iterator.
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