AngersZhuuuu opened a new pull request #30946:
URL: https://github.com/apache/spark/pull/30946
### What changes were proposed in this pull request?
In hive script transform serde mode, NULL format default is `\\N`
```
String nullString = tbl.getProperty(
serdeConstants.SERIALIZATION_NULL_FORMAT, "\\N");
nullSequence = new Text(nullString);
```
I make a mistake that in Spark's code we need to fix and keep same with hive
too. So add some test case to show this issue.
### Why are the changes needed?
add UT
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added UT
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