Detect integer overflow in cql sum functions and throw an error. Note that Cassandra quietly truncates the sum if it doesn't fit in the input type but we rather break compatibility in this case. See https://issues.apache.org/jira/browse/CASSANDRA-4914?focusedCommentId=14158400&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14158400 Fixes #5536 Signed-off-by: Benny Halevy <bhalevy@scylladb.com>