尝试更改 hive 中的列类型，运行 DDL，但抛出错误“

Question

尝试更改hive中的cloumn类型，运行DDL，但抛出错误

运行以下 DDL：

ALTER TABLE INV.HTL_RATE_PLAN
CHANGE RATE_PLAN_RSTRCT_STRT_DT RATE_PLAN_RSTRCT_STRT_DT DATE 
COMMENT 'Advance booking alternate days restriction rule applied to a rate category. This rule dictates the minimum number of days before arrival the guest must book for the rate category to be available.'
AFTER PRICE_GRID_CD;

错误：

Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. Reordering columns is not supported for table INV_TRF.HTL_RATE_PLAN. SerDe may be incompatible.

帮助？我究竟做错了什么。请提出建议。

Answer 1

要更改列类型，您只需要这样做：

ALTER TABLE INV.HTL_RATE_PLAN
CHANGE RATE_PLAN_RSTRCT_STRT_DT RATE_PLAN_RSTRCT_STRT_DT DATE 
COMMENT 'Advance booking alternate days restriction rule applied to a rate category. This rule dictates the minimum number of days before arrival the guest must book for the rate category to be available.';

删除部分AFTER PRICE_GRID_CD将列位置更改为指定列之后，但您的由serde处理的存储类型不支持此操作。