Github user map222 commented on a diff in the pull request:
https://github.com/apache/spark/pull/17737#discussion_r113001678
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -1008,7 +1009,7 @@ class Column(val expr: Expression) extends Logging {
def cast(to: String): Column = cast(CatalystSqlParser.parseDataType(to))
/**
- * Returns an ordering used in sorting.
+ * Returns a sort expression based on the descending order of the column.
--- End diff --
Do you want to include example usages, as in the python documentation? E.g.
for rlike,
```
* {{{
* // find names that start with "Al"
* scala> df.filter( $"name".like("Al%") ).collect()
* Array([Alice,1])
* }}}
```
It would also be helpful for the `startsWith` and `endsWith` functions,
where there are two versions, e.g. `startsWith(other: Column)` and
`startsWith(literal: String)`.
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