mqy opened a new pull request #8967:
URL: https://github.com/apache/arrow/pull/8967
Two env vars ARROW_TEST_DATA and PARQUET_TEST_DATA are required to be set,
for running tests, benchmark.
The major usage likes this:
```
let testdata = std::env::var("PARQUET_TEST_DATA").expect("PARQUET_TEST_DATA
not defined");
```
Some codes gets project root dir by appending relative dir "../../" to
current dir.
I'm thinking that, it would be better to add several public utility
functions for getting test data dir.
Basic design is:
- If env is defined and the value points to existing dir, then we get it;
- Else: get project root dir by search "rust" in current dir's parent, then
join relative data dir.
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