Xarray-specific filter predicate pushdown.

Partition pruning: we can get statistics for the "primary keys" i.e. the dataset dims.

Author: alxmrs

Cargo.lock

@@ -8,6 +8,7 @@ exclude = ["perf_tests/*"]
 [dependencies]
 arrow = { version = "57.2.0", features = ["pyarrow"] }
 async-stream = "0.3"
+async-trait = "0.1"
 datafusion = { version = "51.0.0" }
 datafusion-ffi = { version = "51.0.0" }
 futures = { version = "0.3" }