xudong963 commented on a change in pull request #1621:
URL: https://github.com/apache/arrow-datafusion/pull/1621#discussion_r789405811
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File path: datafusion/tests/sql/expr.rs
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@@ -499,6 +499,16 @@ async fn test_interval_expressions() -> Result<()> {
Ok(())
}
+#[cfg(feature = "unicode_expressions")]
+#[tokio::test]
+async fn test_substring_expr() -> Result<()> {
Review comment:
We can add a test which `from k` (k <=0)
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