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[MINOR][SQL] Modify the example of rand and randn

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### What changes were proposed in this pull request?

This PR fixes the examples of `rand` and `randn`.

### Why are the changes needed?

SPARK-23643 (#20793) fixes an issue which is related to the seed and it causes the result of `rand` and `randn`.
Now the results of `SELECT rand(0)` and `SELECT randn((null)` are `0.7604953758285915` and `1.6034991609278433` respectively, and they should be deterministic because the number of partitions are always 1 (the leaf node is `OneRowRelation`).

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Built the doc and confirmed it.
![rand-doc](https://user-images.githubusercontent.com/4736016/121359059-145a9b80-c96e-11eb-84c2-2f2b313614f3.png)

Closes #32844 from sarutak/rand-example.

Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
This commit is contained in:
Kousuke Saruta 2021-06-10 10:37:38 +09:00 committed by Hyukjin Kwon
parent e9d60156c4
commit 94b66f5e28
1 changed files with 4 additions and 4 deletions
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8
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/randomExpressions.scala
View file

@ -78,9 +78,9 @@ trait ExpressionWithRandomSeed extends Expression {
> SELECT _FUNC_();
0.9629742951434543
> SELECT _FUNC_(0);
0.8446490682263027
0.7604953758285915
> SELECT _FUNC_(null);
0.8446490682263027
0.7604953758285915
""",
note = """
The function is non-deterministic in general case.
@ -131,9 +131,9 @@ object Rand {
> SELECT _FUNC_();
-0.3254147983080288
> SELECT _FUNC_(0);
1.1164209726833079
1.6034991609278433
> SELECT _FUNC_(null);
1.1164209726833079
1.6034991609278433
""",
note = """
The function is non-deterministic in general case.