comphead commented on code in PR #14320:
URL: https://github.com/apache/datafusion/pull/14320#discussion_r1947333625


##########
docs/source/contributor-guide/testing.md:
##########
@@ -58,6 +58,19 @@ Like similar systems such as 
[DuckDB](https://duckdb.org/dev/testing), DataFusio
 
 DataFusion has integrated [sqlite's test 
suite](https://sqlite.org/sqllogictest/doc/trunk/about.wiki) as a supplemental 
test suite that is run whenever a PR is merged into DataFusion. To run it 
manually please refer to the 
[README](https://github.com/apache/datafusion/blob/main/datafusion/sqllogictest/README.md#running-tests-sqlite)
 file for instructions.
 
+## Extended Tests
+
+In addition to the standard CI test suite that is run on all PRs prior to 
merge,
+DataFusion has "extended" tests (defined in [extended.yml]) that are run on 
each
+commit to `main`. These tests rarely fail but take significantly longer to run
+than the standard test suite and add important test coverage such as that the
+code works when there are hash collisions as well as running the relevant
+portions of the entire [sqlite test suite].
+
+[extended.yml]: 
https://github.com/apache/datafusion/blob/main/.github/workflows/extended.yml
+[sqlite test suite]: https://www.sqlite.org/sqllogictest/dir?ci=tip
+

Review Comment:
   ```suggestion
   
   ```



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