YiwenWu commented on code in PR #3712:
URL: https://github.com/apache/calcite/pull/3712#discussion_r1510212954


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babel/src/test/resources/sql/spark.iq:
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@@ -0,0 +1,243 @@
+# spark.iq - Babel test for Spark dialect of SQL

Review Comment:
   1. Compared to `SqlOperatorTest`, I think the function tests in Babel are 
more accurate and complete. Therefore, 
   references`big-query.iq` and `redshift.iq`,  `spark.iq` were added to verify 
the correctness of function execution.
   2. I think that unit tests can be added to this file when adding spark 
functions, but it is unnecessary.



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