Function does not exist
Test for #658, IS NULL incorrect
Test for #504, inserting VARBINARY into VARCHAR
Test for #478, CONCAT with MEDIUMINT
Check warnings if output is received, too
Test for #477, LEFT with string truncation
Add full warning text for sake of AAS
merge nathanlws: Misc regression tests

Merge pull request #961 from nathanlws/sql-layer/misc-regression-tests
https://github.com/FoundationDB/sql-layer/pull/961