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https://issues.apache.org/jira/browse/ARROW-10967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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meng qingyou reopened ARROW-10967:
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> [Rust] Make env vars ARROW_TEST_DATA and PARQUET_TEST_DATA optional
> -------------------------------------------------------------------
>
> Key: ARROW-10967
> URL: https://issues.apache.org/jira/browse/ARROW-10967
> Project: Apache Arrow
> Issue Type: Test
> Reporter: meng qingyou
> Assignee: meng qingyou
> Priority: Minor
>
> Facts/problems:
> # Two env vars
> *ARROW_TEST_DATA* and *PARQUET_TEST_DATA* are required to be set, for
> running tests, benchmarks, examples.
> # There are totally eighteen .rs files using these environment variables.
> # The major usage likes this: ```
> let testdata =
> std::env::var("PARQUET_TEST_DATA").expect("PARQUET_TEST_DATA not
> defined");```
> # Somebody tried to assembly the test data directories by appending relative
> dir to *current dir* of current running process, but that MAY highly depend
> on the actual current dir (for example, rust/, rust/datafusion, etc.).
> Here is my solution:
> Suppose：
> # *current_dir* is *ALWAYS* inside the *git workspace dir*
> # We know an *data dir X relative to git workspace dir*
> Get absolute dir of *X* == get absolute dir of *git workspace dir*.
> Given *current dir* (in *git workspace dir*)，we visit the dir and it's
> parents, check if ."git" (file or dir）exists. The first dir that contains
> ".git" SHOULD be *git workspace dir*.
>
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