Maxim Gekk created SPARK-25935:
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Summary: Prevent nulls from JSON parser
Key: SPARK-25935
URL: https://issues.apache.org/jira/browse/SPARK-25935
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Maxim Gekk
Currently, JSON parser can produce nulls if it cannot detect any valid JSON
token on the root level, see
https://github.com/apache/spark/blob/4d6704db4d490bd1830ed3c757525f41058523e0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/json/JacksonParser.scala#L402
. As a consequence of that, the from_json() function can produce null in the
PERMISSIVE mode. To prevent that, need to throw an exception which should treat
as a bad record and handled according specified mode.
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