Would appreciate help with first PR

[Paul Jackson]

I just created https://github.com/apache/calcite/pull/3495 for 
https://issues.apache.org/jira/browse/CALCITE-6044. It's my first PR. I'm 
getting what appears to be a code quality error or a test failure in 
ServerTest.testTruncateTable(), which passes when I run it locally. Any tips 
for where to look next?
Thanks,-Paul