andygrove commented on code in PR #2686:
URL: https://github.com/apache/arrow-datafusion/pull/2686#discussion_r889622003
##########
datafusion/optimizer/src/simplify_expressions.rs:
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@@ -745,22 +744,42 @@ impl<'a, S: SimplifyInfo> ExprRewriter for Simplifier<'a,
S> {
}
}
+/// A macro to assert that one string is contained within another with
+/// a nice error message if they are not.
+///
+/// Usage: `assert_contains!(actual, expected)`
+///
+/// Is a macro so test error
+/// messages are on the same line as the failure;
+///
+/// Both arguments must be convertable into Strings (Into<String>)
+#[macro_export]
+macro_rules! assert_contains {
Review Comment:
this is copy-and-pasted from the core crate
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