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ff94dfd8a7
This patch adds the possibility to have client commands that do not return results from DBMS. While processing such commands we must be able to preserve errors until the next interaction with client. Specifically if the transaction is bf aborted while processing such a non-returning command, then we have to keep the deadlock error until the client issues a command that may return the error. To handle such cases, client_state::before_command() now takes parameter keep_command_error. The DBMS is supposed set keep_command_error true to instruct wsrep-lib to preserve errors (if any) until the next command which sets keep_command_error false. Dealing with a case where current client command does not return result. Work in progress. Fix typo and add assertions in keep_command_error() Make keep_command_error a parameter to before_commit() Fix comment about keep_command_error Handle keep_command_error with s_must_abort in wsrep_before_command() Fix unit test