蜂巢：由於目標表已分區，因此需要指定分區列

Question

我不知道是否有可能在蜂巢中插入一個非分區表成被分區之一。 第一個表如下：

hive> describe extended user_ratings;
OK
userid                  int                                         
movieid                 int                                         
rating                  int                                         
unixtime                int                                         

Detailed Table Information  Table(tableName:user_ratings, dbName:ml, owner:cloudera, createTime:1500142667, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:userid, type:int, comment:null), FieldSchema(name:movieid, type:int, comment:null), FieldSchema(name:rating, type:int, comment:null), FieldSchema(name:unixtime, type:int, comment:null)], location:hdfs://quickstart.cloudera:8020/user/hive/warehouse/ml.db/user_ratings, inputFormat:org.apache.hadoop.mapred.TextInputFormat, outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, compressed:false, numBuckets:-1, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{serialization.format=    , field.delim=
Time taken: 0.418 seconds, Fetched: 6 row(s)

因此，新表為：

hive> describe extended rating_buckets;
OK
userid                  int                                         
movieid                 int                                         
rating                  int                                         
unixtime                int                                         
genre                   string                                      

# Partition Information      
# col_name              data_type               comment             

genre                   string                                      

Detailed Table Information  Table(tableName:rating_buckets, dbName:default, owner:cloudera, createTime:1500506879, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:userid, type:int, comment:null), FieldSchema(name:movieid, type:int, comment:null), FieldSchema(name:rating, type:int, comment:null), FieldSchema(name:unixtime, type:int, comment:null), FieldSchema(name:genre, type:string, comment:null)], location:hdfs://quickstart.cloudera:8020/user/hive/warehouse/rating_buckets, inputFormat:org.apache.hadoop.mapred.TextInputFormat, outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, compressed:false, numBuckets:8, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{serialization.format=  , field.delim=
Time taken: 0.46 seconds, Fetched: 12 row(s)

似乎正在將分區（“類型”）視為與其他列相同...我可能創建錯了嗎？

無論如何，這是當我嘗試對新表執行INSERT OVERWRITE時發生的情況：

hive> FROM ml.user_ratings
    > INSERT OVERWRITE TABLE rating_buckets
    > select userid, movieid, rating, unixtime;
FAILED: SemanticException 2:23 Need to specify partition columns because the destination table is partitioned. Error encountered near token 'rating_buckets'

我應該只重新創建帶有分區的第一個表嗎？ 有沒有辦法復制第一個表並保持分區不變？

Answer 1

您甚至沒有在選擇列表中包括流派。 我認為它必須排在最后。 您不能一無所有。

您還需要使用表指定分區，如下所示：

insert overwrite table ratings_buckets partition(genre)
select
userid,
movieid,
rating,
unixtime,
<SOMETHING> as genre
from
...