Question

有没有办法知道存储的配置单元分隔符？我试过Describe扩展但没有用..我已经搜索了很多，还没有得到答案。

Answer 1

其他答案是正确的，如果它不是默认值，你将获得字段分隔符。但是，如果分隔符是默认分隔符，我不会看到它，它是Control-A字符或ASCII中的“\ 01”

Answer 2

尝试运行＆＃34; show create table ＆＃34;命令，它会显示分隔符。

Answer 3

我看到使用describe extended table命令

示例：

hive> create table difdelimiter (id int, name string) 
      row format delimited 
      fields terminated by ',';

hive> describe extended difdelimiter; 
OK id                   int     
   name                 string                                      
   Detailed Table Information   Table(tableName:difdelimiter, dbName:default, owner:cloudera, createTime:1439375349, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:id, type:int, comment:null), FieldSchema(name:name, type:string, comment:null)], location:hdfs://quickstart.cloudera:8020/user/hive/warehouse/difdelimiter, 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=,}), bucketCols:[], sortCols:[], parameters:{}, skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[], skewedColValueLocationMaps:{}), storedAsSubDirectories:false), partitionKeys:[], parameters:{transient_lastDdlTime=1439375349}, viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE)  Time taken: 0.154 seconds, Fetched: 4 row(s)

以下是有关分隔符的信息

parameters:{serialization.format=,, field.delim=,}

根据评论添加

hive> create table tb3 (id int, name string) row format delimited fields terminated by '/t';
OK
Time taken: 0.09 seconds
hive> describe extended tb3;
OK
id                      int                                         
name                    string                                      

Detailed Table Information  Table(tableName:tb3, dbName:default, owner:cloudera, createTime:1439377591, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:id, type:int, comment:null), FieldSchema(name:name, type:string, comment:null)], location:hdfs://quickstart.cloudera:8020/user/hive/warehouse/tb3, 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=/t, field.delim=/t}), bucketCols:[], sortCols:[], parameters:{}, skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[], skewedColValueLocationMaps:{}), storedAsSubDirectories:false), partitionKeys:[], parameters:{transient_lastDdlTime=1439377591}, viewOriginalText:null, viewExpandedText:null, tableType:MANAGED_TABLE) 
Time taken: 0.125 seconds, Fetched: 4 row(s)

parameters:{serialization.format=/t, field.delim=/t})

Answer 4

当您执行 describe extended your_table_name 命令时，您将在最后一部分（详细信息表信息）中获取此信息 - 只需搜索 field.delim 。

但是，结果集格式不是很好，而且用户友好的方法是 show create table your_table_name 。

如何获取现有的Hive表分隔符

4 个答案: