Impl traits for polars crate

Cargo.toml

@@ -15,11 +15,13 @@ default = ["reqwest-async", "reqwest-sync"]
 reqwest-async = ["reqwest"]
 reqwest-sync = ["reqwest/blocking"]
 ureq-sync = ["ureq"]
+polars = ["ureq", "polars-io"]
 
 [dependencies]
 async-trait = "0.1.51"
 byteorder = "1.4.2"
 bytes = "1.0.1"
+polars-io = { version = "0.32.1", features = ["parquet", "csv"], optional = true }
 read-logger = "0.2.0"
 reqwest = { version = "0.11.0", default-features = false, features = ["default-tls"], optional = true }
 thiserror = "1.0"

src/lib.rs

@@ -42,6 +42,8 @@
 
 mod buffered_range_client;
 mod error;
+#[cfg(feature = "polars")]
+mod polars;
 mod range_client;
 #[cfg(any(feature = "reqwest-async", feature = "reqwest-sync"))]
 mod reqwest_client;

src/polars.rs

@@ -0,0 +1,5 @@
+use crate::{SyncBufferedHttpRangeClient, SyncHttpRangeClient};
+use polars_io::mmap::MmapBytesReader;
+
+impl<T: SyncHttpRangeClient + Send + Sync> MmapBytesReader for SyncBufferedHttpRangeClient<T> {}
+// Polars requires MmapBytesReader::to_bytes or to_file, which doesn't make sense for SyncHttpRangeClient