为什么输出是这样的?为什么第二行在第二列select堆栈中给出空值(2,'a',10,日期'2015-01-01',1,'b',日期'2015-02-02',2)

lfapxunr  于 2021-06-25  发布在  Hive
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为什么输出是这样的为什么第二行给出 NULL 第二列中的值 select stack(2,'A',10,date '2015-01-01',1,'B',date '2015-02-02',2) :

0: jdbc:hive2://sandbox-hdp.hortonworks.com:1> select  stack(2,'A',10,date '2015-01-01',1,'B',date '2015-02-02',2) as (col0,col1,col2,col3);
Error: Error while compiling statement: FAILED: UDFArgumentException Argument 2's type (int) should be equal to argument 6's type (date) (state=42000,code=40000)

0: jdbc:hive2://sandbox-hdp.hortonworks.com:1> select  stack(2,'A',10,date '2015-01-01',1,'B',20,date '2015-02-02') as (col0,col1,col2,col3);

INFO  : Compiling command(queryId=hive_20191225124022_380b3a4c-9870-4f5c-89c8-a696af39f985): select  stack(2,'A',10,date '2015-01-01',1,'B',20,date '2015-02-02') as (col0,col1,col2,col3)

INFO  : Semantic Analysis Completed (retrial = false)

INFO  : Returning Hive schema: Schema(fieldSchemas:[FieldSchema(name:col0, type:string, comment:null), FieldSchema(name:col1, type:int, comment:null), FieldSchema(name:col2, type:date, comment:null), FieldSchema(name:col3, type:int, comment:null)], properties:null)

INFO  : Completed compiling command(queryId=hive_20191225124022_380b3a4c-9870-4f5c-89c8-a696af39f985); Time taken: 0.545 seconds

INFO  : Executing command(queryId=hive_20191225124022_380b3a4c-9870-4f5c-89c8-a696af39f985): select  stack(2,'A',10,date '2015-01-01',1,'B',20,date '2015-02-02') as (col0,col1,col2,col3)

INFO  : Completed executing command(queryId=hive_20191225124022_380b3a4c-9870-4f5c-89c8-a696af39f985); Time taken: 0.006 seconds

INFO  : OK

| col0  | col1  |    col2     | col3  |

| A     | 10    | 2015-01-01  | 1     |

| B     | NULL  | 2015-02-02  | 1     |

2 rows selected (0.594 seconds)
ffvjumwh

ffvjumwh1#

在hive 1.2中,select语句引发异常:

select stack(2,'A',10,date '2015-01-01',1,'B',date '2015-02-02',2);

失败:udfargumentexception参数2的类型(int)应等于参数6的类型(date)
stack(2)的第一个参数表示有两个元组。这些元组应该具有相同的模式。第一个元组:

'A',10,date '2015-01-01',1 --this one contains 4 columns

第二元组:

'B',date '2015-02-02',2 --this one contains 3 columns

在“b”之后添加一些int第二列以匹配第一个元组。它可以为null,但应该在第二个元组中。我加了20:

select stack(2,'A',10,date '2015-01-01',1,'B',20, date '2015-02-02',2);

OK
A       10      2015-01-01      1
B       20      2015-02-02      2
Time taken: 0.363 seconds, Fetched: 2 row(s)

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