Add a test case for group by alias
ENG-6898: ratelimit error log.
ENG-6898: fix tests.
ENG-6898: keep proc name in format to rate limit with procname in it.
Make OperatorExpression.refineValueType robust to cast expressions
Fix mispartitioned tuple error when INSERT contains non-trivial expression assigned to partitioning column
ENG-6898: remove %s from response.
Merge branch 'master' into ENG-6898
Merge pull request #1698 from VoltDB/ENG-6898

Eng 6898
Let StatementPartitioning keep producing useful diagnostics in compiler report.
Make compiler report produce "explain" output for expressions instead of JSON.
Merge branch 'master' into ENG-5929-insert-cast-exception
sql.txt: just added a '\n' after each ';', so that commands are more
easily visible, in Web Studio (for GEB tests).
ENG-6962 multi-column distinct accidentally enabled for wrong answer
A better way to clean up memory when long running SQL has exception
Merge pull request #1707 from VoltDB/ENG-6970-memory

A better way to clean up memory when long running SQL has exception
Merge pull request #1705 from VoltDB/ENG-6962-redisable-multicolumn-distinct

ENG-6962 multi-column distinct accidentally enabled for wrong answer
Reduce the size of the cached plan in the EE; purge the string memory when queries finishes
Merge pull request #1701 from VoltDB/ENG-5929-insert-cast-exception

Allow non-trivial expressions assigned to partitioning column in `INSERT` statements.
StudioWebDiag.groovy: updated to check for an ‘Error:’ before looking
for results in a table, and the Error need not be the first thing
listed; after each query test, it now deletes all data from
REPLICATED_TABLE, as well as PARTITIONED_TABLE; also increased the range
of the try/finally, to catch most test failures; and added debug print
(triggered whenever a test fails, or optionally for all tests), and wait
options, so you can see the results go by slowly.
sql.txt: added lots of tests, of UPSERT (mostly modeled on existing
tests of INSERT), INSERT INTO SELECT, and UPSERT INTO SELECT.