Github user viirya commented on the issue:
https://github.com/apache/spark/pull/22309
```
[error]
/home/jenkins/workspace/SparkPullRequestBuilder/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala:401:
value isDefined is not a member of
org.apache.spark.sql.catalyst.expressions.Expression
[error] if (path.isDefined) {
[error] ^
```
You need to rebase with current master. `path` is not `Option` now.
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