Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4767#discussion_r25405074
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -293,9 +294,15 @@ class DataFrame protected[sql](
* 1983 03 0.410516 0.442194
* 1984 04 0.450090 0.483521
* }}}
+ * @param numRows Number of rows to show
* @group basic
*/
- def show(): Unit = println(showString())
+ def show(numRows: Int = 20): Unit = println(showString(numRows))
+
+ /**
+ * Displays the [[DataFrame]] in a tabular form. (For Java compatibility)
+ */
+ def show(): Unit = println(showString(20))
--- End diff --
what I mean is...
```scala
/**
* Displays the [[DataFrame]] in a tabular form. For example:
* {{{
* year month AVG('Adj Close) MAX('Adj Close)
* 1980 12 0.503218 0.595103
* 1981 01 0.523289 0.570307
* 1982 02 0.436504 0.475256
* 1983 03 0.410516 0.442194
* 1984 04 0.450090 0.483521
* ...
* }}}
* @param numRows Number of rows to show
* @group basic
*/
def show(numRows: Int): Unit = println(showString(numRows))
/**
* Displays the top 20 rows of the [[DataFrame]] in a tabular form.
*/
def show(): Unit = show(20)
```
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