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| author | Sean Zhong <seanzhong@databricks.com> | 2016-09-21 16:53:34 +0800 |
|---|---|---|
| committer | Wenchen Fan <wenchen@databricks.com> | 2016-09-21 16:53:34 +0800 |
| commit | 3977223a3268aaf6913a325ee459139a4a302b1c (patch) | |
| tree | ad0b596e5bdc22821abd2e215712eb672ae54037 /python | |
| parent | 7654385f268a3f481c4574ce47a19ab21155efd5 (diff) | |
| download | spark-3977223a3268aaf6913a325ee459139a4a302b1c.tar.gz spark-3977223a3268aaf6913a325ee459139a4a302b1c.tar.bz2 spark-3977223a3268aaf6913a325ee459139a4a302b1c.zip | |
[SPARK-17617][SQL] Remainder(%) expression.eval returns incorrect result on double value
## What changes were proposed in this pull request?
Remainder(%) expression's `eval()` returns incorrect result when the dividend is a big double. The reason is that Remainder converts the double dividend to decimal to do "%", and that lose precision.
This bug only affects the `eval()` that is used by constant folding, the codegen path is not impacted.
### Before change
```
scala> -5083676433652386516D % 10
res2: Double = -6.0
scala> spark.sql("select -5083676433652386516D % 10 as a").show
+---+
| a|
+---+
|0.0|
+---+
```
### After change
```
scala> spark.sql("select -5083676433652386516D % 10 as a").show
+----+
| a|
+----+
|-6.0|
+----+
```
## How was this patch tested?
Unit test.
Author: Sean Zhong <seanzhong@databricks.com>
Closes #15171 from clockfly/SPARK-17617.
Diffstat (limited to 'python')
0 files changed, 0 insertions, 0 deletions