Smzgl fix mariadb mutilple schema table fields #4580
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fix:修复mariadb同一实例不同数据库下相同表名相同字段名出现字段叠加的问题
当同一实例不同数据库存在相同表名和相同字段名, 并且同名表的字段数量不同, 同名字段是表最后一个字段, 并且该字段存在约束时, 例如字段类型是JSON, 会出现字段叠加. 导致访问数据库时, 出现数组越界.