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

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

meng qingyou created ARROW-10967:
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             Summary: 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


Facts/problems:
 # Two vars *c* and *PARQUET_TEST_DATA* are required by be set for running tests,  benchmarks, examples.
 # There are totally eighteen .rs files use 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 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 *absolute dir X relative to git workspace dir*

Get absolute dir of X == get absolute dir *TOP* 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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