alamb commented on code in PR #13215:
URL: https://github.com/apache/datafusion/pull/13215#discussion_r1828343830
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datafusion/sqllogictest/README.md:
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@@ -102,6 +102,39 @@ SELECT * from foo;
Assuming it looks good, check it in!
+## Cookbook: Testing for whitespace
+
+The `sqllogictest` runner will automatically strip trailing whitespace, meaning
+it additional effort to verify that trailing whitespace is correctly produced
+
+For example, the following test can't distinguish between `Andrew` and `Andrew
`
+(with trailing space):
+
+```text
+query T
+select substr('Andrew Lamb', 1, 7)
+----
+Andrew
+```
+
+To test trailing whitespace, project additional non-whitespace column on the
+right. For example, by selecting `'XX'` after the column of interest, the test
Review Comment:
Let's use `|` to be consistent with what you added . I will update the PR
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