kou commented on PR #43906:
URL: https://github.com/apache/arrow/pull/43906#issuecomment-2325429731

   I think that we can't inject Parquet test data directory path by environment 
variable.
   Because environment variable doesn't exist on Web browser.
   
   But... we may be able to use 
https://github.com/pyodide/pyodide/blob/a448c045cf5640c5050e0c3722bafc0d58659fcc/src/js/pyodide.ts#L151-L160
 :
   
   ```diff
   diff --git a/python/scripts/run_emscripten_tests.py 
b/python/scripts/run_emscripten_tests.py
   index 1a4b4a4e05..79996b1f92 100644
   --- a/python/scripts/run_emscripten_tests.py
   +++ b/python/scripts/run_emscripten_tests.py
   @@ -19,6 +19,7 @@
    import argparse
    import contextlib
    import http.server
   +import json
    import os
    import queue
    import shutil
   @@ -153,7 +154,7 @@ class NodeDriver:
            self.execute_js(
                f"""
            const {{ loadPyodide }} = require('{dist_dir}/pyodide.js');
   -        let pyodide = await loadPyodide();
   +        let pyodide = await loadPyodide({json.dumps({"PARQUET_TEST_DATA": 
os.environ.get("PARQUET_TEST_DATA")})});
            """
            )
    
   ```


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