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This commit makes idle_session_timeout a query option. idle_session_timeout currently can be set as a command line option, which will be the default timeout for sessions. HS2 sessions can override it with a smaller value by setting it in the configuration overlay of HS2 OpenSession(). However, we can't override idle_session_timeout for JDBC/ODBC connections, because we cannot put this in the connection string. This commit is a workaround for this problem, it allows JDBC/ODBC connections to set the session timeout as a query option with the SET statement. After this commit, the session timeout can be overridden to any value, i.e. the command line flag idle_session_timeout doesn't limit this option anymore. I created an automated test case in JdbcTest.java based on test_hs2.py::test_concurrent_session_mixed_idle_timeout. I also extended the test_session_expiration and test_set_and_unset test suites. Change-Id: I32e2775f80da387b0df4195fe2c5435b3f8e585e Reviewed-on: http://gerrit.cloudera.org:8080/8490 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins