AngersZhuuuu commented on pull request #29421:
URL: https://github.com/apache/spark/pull/29421#issuecomment-677524546
Hive no serde
input column size > 2
```
hive> SELECT TRANSFORM(a, b, c)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> USING 'cat'
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> FROM (
> select 1 as a, 2 as b, 3 as c
> ) tmp ;
OK
1 2
Time taken: 19.432 seconds, Fetched: 1 row(s)
```
input column size = 2
```
hive> SELECT TRANSFORM(a, b)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> USING 'cat'
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> FROM (
> select 1 as a, 2 as b
> ) tmp ;
OK
1 2
Time taken: 20.735 seconds, Fetched: 1 row(s)
```
input column size < 2
```
hive> SELECT TRANSFORM(a)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> USING 'cat'
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '|'
> LINES TERMINATED BY '\n'
> NULL DEFINED AS 'NULL'
> FROM (
> select 1 as a
> ) tmp ;
OK
1 NULL
Time taken: 20.1 seconds, Fetched: 1 row(s)
```
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