houqp commented on a change in pull request #676:
URL: https://github.com/apache/arrow-datafusion/pull/676#discussion_r663543300
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File path: ballista/rust/core/Cargo.toml
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@@ -33,6 +33,7 @@ simd = ["datafusion/simd"]
ahash = "0.7"
async-trait = "0.1.36"
futures = "0.3"
+hashbrown = "0.11"
Review comment:
From the official readme:
```
Since Rust 1.36, this is now the HashMap implementation for the Rust
standard library. However you may still want to use this crate instead since it
works in environments without std, such as embedded systems and kernels.
```
Are we introducing it because we are expecting to use ballista in embedded
systems?
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