bigdata - Alter column data type in Hive -

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we need alter table column data type string date. while trying getting below error. please help.

hive> describe sales_staging;

ok

cust_id string prod_num string
qty int sale_date string

sale_id string time taken: 0.151 seconds, fetched: 5 row(s)

hive> alter table sales_staging change sale_date sale_date date ;

failed: execution error, return code 1 org.apache.hadoop.hive.ql.exec.ddltask. unable alter table. following columns have types incompatible existing columns in respective positions :sale_date

hive>

you can't give same name column wish change datatype of. use this

alter table sales_staging change sale_date sale_date_new date;

refer apache hive wiki


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