add docs

README.md

@@ -132,6 +132,18 @@ echo $USER
 xxchan
 ```
 
+### Extension: Retry
+
+```text
+query I retry 3 backoff 5s
+SELECT id FROM test;
+----
+1
+
+statement ok retry 3 backoff 5s
+UPDATE test SET id = 1;
+```
+
 ### Extension: Environment variable substitution in query and statement
 
 It needs to be enabled by adding `control substitution on` to the test file.

sqllogictest/src/runner.rs

@@ -858,6 +858,7 @@ impl<D: AsyncDB, M: MakeConnection<Conn = D>> Runner<D, M> {
             if result.is_ok() {
                 return result;
             }
+            tracing::warn!(target:"sqllogictest::retry", backoff = ?retry.backoff, error = ?result, "retrying");
             D::sleep(retry.backoff).await;
             last_error = result.err();
         }