[jira] [Reopened] (ARROW-10967) [Rust] Make env vars ARROW_TEST_DATA and PARQUET_TEST_DATA optional

["meng qingyou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

meng qingyou reopened ARROW-10967:
----------------------------------

> [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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