Prevent crash COM_STMT_EXECUTE and invalid stmt_id #4481
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If an invalid stmt_id is passed to COM_STMT_EXECUTE , ProxySQL used to crash due to an assert().
It seems that some buggy clients execute COM_STMT_EXECUTE with an invalid stmt_id after an auto-reconnect.
This commit returns an error to the client.
Closes #3371
Closes #3808
Closes #4475