roncenzhao created SPARK-20017:
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Summary: Functions "str_to_map" and "explode" throws NPE exceptioin
Key: SPARK-20017
URL: https://issues.apache.org/jira/browse/SPARK-20017
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.1.0
Reporter: roncenzhao
```
val sqlDf = spark.sql("select k,v from (select str_to_map('') as map_col from
range(2)) tbl lateral view explode(map_col) as k,v")
sqlDf.show
```
The sql throws NPE exception.
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