Question

我正在尝试从源配置单元表中读取数据到目标配置单元表，这是我创建的部分内容使用源数据库表模式的目标配置单元数据库中的表，我没有问题所以我想动态读取分区键并将它们插入到load语句中以便将数据导入目标表。

我想知道是否有人可以帮助我从现有的表模式中读取分区键？

这是示例表模式...

     hive> describe extended pageviews;
     OK
     eventtime               string
     userid                  string
     page                    string
     dt                      string
     applicationtype         string

# Partition Information
# col_name              data_type               comment

dt                      string
applicationtype         string

Detailed Table Information      
Table(tableName:pageviews, dbName:default, owner:root, createTime:1413687270, lastAccessTime:0, retention:0, 
sd:StorageDescriptor(cols:[FieldSchema(name:eventtime, type:string, comment:null), 
FieldSchema(name:userid, type:string, comment:null), 
FieldSchema(name:page, type:string, comment:null), FieldSchema(name:dt, type:string,  comment:null),
FieldSchema(name:applicationtype, type:string, comment:null)], location:hdfs://sandbox.hortonworks.com:8020/apps/hive/warehouse/pageviews,
 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=1}), bucketCols:[], sortCols:[], parameters:{}, 
  skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[], skewedColValueLocationMaps:{}),
  storedAsSubDirectories:false), partitionKeys:[FieldSchema(name:dt, type:string, comment:null),  
FieldSchema(name:applicationtype, type:string, comment:null)],
 parameters:{transient_lastDdlTime=1413687270}, viewOriginalText:null,
   viewExpandedText:null, tableType:MANAGED_TABLE)

Time taken: 0.903 seconds, Fetched: 13 row(s)

如何从现有的配置单元表中读取分区键

0 个答案: