Access denied for user appears when using mycat agent to connect to the database

background: according to the mycat document, try to build a mycat+MariaDB service on a Tencent Cloud. Then try to access the data with Navicat (using port 8099 of mycat) and Access denied for user "test"
check: 

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Objective-c mycat mariadb
Mar.06,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3aa3f-2c215.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3aa3f-2c215.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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