waynexia commented on a change in pull request #8910:
URL: https://github.com/apache/arrow/pull/8910#discussion_r543037102
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File path: rust/datafusion/src/logical_plan/builder.rs
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@@ -90,77 +75,51 @@ impl LogicalPlanBuilder {
options: CsvReadOptions,
projection: Option<Vec<usize>>,
) -> Result<Self> {
- let schema: Schema = match options.schema {
- Some(s) => s.to_owned(),
- None => CsvFile::try_new(path, options)?
- .schema()
- .as_ref()
- .to_owned(),
- };
-
- let projected_schema = projection
- .map(|p| Schema::new(p.iter().map(|i|
schema.field(*i).clone()).collect()))
- .map_or(SchemaRef::new(schema), SchemaRef::new)
- .to_dfschema_ref()?;
-
let provider = Arc::new(CsvFile::try_new(path, options)?);
- let schema = provider.schema();
-
- let table_scan = LogicalPlan::TableScan {
- schema_name: "".to_string(),
- source: TableSource::FromProvider(provider),
- table_schema: schema,
- projected_schema,
- projection: None,
- };
-
- Ok(Self::from(&table_scan))
+ Self::scan("", provider, projection)
}
/// Scan a Parquet data source
pub fn scan_parquet(path: &str, projection: Option<Vec<usize>>) ->
Result<Self> {
let provider = Arc::new(ParquetTable::try_new(path)?);
+ Self::scan("", provider, projection)
+ }
+
+ /// Scan an empty data source, mainly used in tests
+ pub fn scan_empty(
+ name: &str,
Review comment:
Maybe we can remove this parameter and provide `scan()` a placeholder
like `""`?
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