Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21318#discussion_r187842050
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -39,7 +39,21 @@ import org.apache.spark.util.Utils
/**
- * Functions available for DataFrame operations.
+ * Commonly used functions available for DataFrame operations. Using
functions defined here provides
+ * a little bit more compile-time safety to make sure the function exists.
+ *
+ * Spark also includes more built-in functions that are less common and
are not defined here.
+ * You can still access them (and all the functions defined here) using
the [[functions.expr()]] API
--- End diff --
```
[error]
/home/jenkins/workspace/SparkPullRequestBuilder/sql/core/target/java/org/apache/spark/sql/functions.java:7:
error: unexpected text
[error] * You can still access them (and all the functions defined here)
using the {@link functions.expr()} API
[error]
^
[error]
/home/jenkins/workspace/SparkPullRequestBuilder/sql/core/target/java/org/apache/spark/sql/functions.java:9:
error: unexpected text
[error] * the latest version of Spark at {@link
https://spark.apache.org/docs/latest/api/sql/index.html}.
[error] ^
```
Seems both links are the problem in Javadoc. Shall we just use ``
`functions.expr() ` `` and leave the
`https://spark.apache.org/docs/latest/api/sql/index.html` like without
`[[...]]`?
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