Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/21190
@cloud-fan . Thank you for investigating this. Could you fix
[jsonExpressions.scala Line
520](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala#L520),
too?
```
Caused by: java.lang.IllegalStateException: SQLConf should only be created
and accessed on the driver.
at org.apache.spark.sql.internal.SQLConf$.get(SQLConf.scala:113)
at
org.apache.spark.sql.catalyst.expressions.JsonToStructs.<init>(jsonExpressions.scala:520)
```
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