andygrove commented on code in PR #15168:
URL: https://github.com/apache/datafusion/pull/15168#discussion_r1995461595


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datafusion/sqllogictest/test_files/spark/math/expm1.slt:
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+# or more contributor license agreements.  See the NOTICE file
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+# to you under the Apache License, Version 2.0 (the
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+
+#   http://www.apache.org/licenses/LICENSE-2.0
+
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+

Review Comment:
   Here is my suggestion. 
   
   1. Write a Python script that generates interesting test data (probably in 
Parquet format) with edge cases using PySpark
   2. Create files containing SQL queries that operate on these test files
   3. Write a Python script to run those queries via PySpark and write results 
out to file
   4. Write a Rust script to run those queries using datafusion-spark and write 
results out to file
   5. Write a script that can compare the Spark and datafusion-spark output and 
report on any differences



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