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Previously, running ALTER TABLE <table> CONVERT TO ICEBERG on an Iceberg table produced an error. This patch fixes that, so the statement will do nothing when called on an Iceberg table and return with 'Table has already been migrated.' message. This is achieved by adding a new flag to StatementBase to signal when a statement ends up NO_OP, if that's true, the new TStmtType::NO_OP will be set as TExecRequest's type and noop_result can be used to set result from Frontend-side. Tests: * extended fe and e2e tests Change-Id: I41ecbfd350d38e4e3fd7b813a4fc27211d828f73 Reviewed-on: http://gerrit.cloudera.org:8080/23699 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Peter Rozsa <prozsa@cloudera.com>