Random testing saw a different set of results (both nonempty) when running SELECT rowid FROM seed WHERE (_string::STRING % _string::STRING)::BOOL as a regular select vs cdc expression. More details to come, hopefully. Might be an issue with my test harness.

Edit: Okay, the context here is that string mod string is a trigram operation that depends on session data, so should be disallowed (or we need a methodical approach, same question as in #90354).

Jira issue: CRDB-20759

Epic CRDB-17161