saikrishna1-bidgely commented on code in PR #4908:
URL: https://github.com/apache/arrow-datafusion/pull/4908#discussion_r1096915932
##########
datafusion/core/src/execution/context.rs:
##########
@@ -613,50 +615,29 @@ impl SessionContext {
/// [`read_table`](Self::read_table) with a [`ListingTable`].
async fn _read_type<'a>(
&self,
- table_path: impl AsRef<str>,
+ table_paths: Vec<impl AsRef<str>>,
options: impl ReadOptions<'a>,
) -> Result<DataFrame> {
- let table_path = ListingTableUrl::parse(table_path)?;
+ let table_paths = table_paths
+ .iter()
+ .map(ListingTableUrl::parse)
+ .collect::<Result<Vec<ListingTableUrl>>>()?;
let session_config = self.copied_config();
let listing_options = options.to_listing_options(&session_config);
let resolved_schema = match options
- .get_resolved_schema(&session_config, self.state(),
table_path.clone())
+ .get_resolved_schema(&session_config, self.state(),
table_paths[0].clone())
.await
{
Ok(resolved_schema) => resolved_schema,
Err(e) => return Err(e),
};
- let config = ListingTableConfig::new(table_path)
+ let config = ListingTableConfig::new_with_multi_paths(table_paths)
.with_listing_options(listing_options)
.with_schema(resolved_schema);
let provider = ListingTable::try_new(config)?;
self.read_table(Arc::new(provider))
}
- /// Creates a [`DataFrame`] for reading an Avro data source.
- ///
- /// For more control such as reading multiple files, you can use
- /// [`read_table`](Self::read_table) with a [`ListingTable`].
- pub async fn read_avro(
- &self,
- table_path: impl AsRef<str>,
- options: AvroReadOptions<'_>,
- ) -> Result<DataFrame> {
- self._read_type(table_path, options).await
- }
Review Comment:
Hi @alamb, In the above example, we will need to use the `use` statement
even when we are using `read_csv("s3://bucket/key", options)`. Instead I
propose the following:
1. What if we implement AsRef for Vec. Then, we only need to use the `use`
statement when we are calling for multiple paths. The default single path code
will remain unchanged. The AsRef will simply concatenate all the strings in Vec
with `,` delimiter. And in the `_read_type`, we will split on `,`.
2. How about having a different method `read_csvs` for taking multiple
paths. `read_csvs` is a lot cleaner than `read_csv_with_multi_paths`.
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