[SPARK-17617][SQL] Remainder(%) expression.eval returns incorrect result on double value #15171
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LGTM |
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Test build #65693 has finished for PR 15171 at commit
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retest this please |
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Test build #65701 has finished for PR 15171 at commit
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thanks, merging to master/2.0! |
asfgit
pushed a commit
that referenced
this pull request
Sep 21, 2016
…ult 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.
(cherry picked from commit 3977223)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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also 1.6 |
asfgit
pushed a commit
that referenced
this pull request
Sep 21, 2016
…ult 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.
(cherry picked from commit 3977223)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
zzcclp
pushed a commit
to zzcclp/spark
that referenced
this pull request
Sep 22, 2016
…ult 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 apache#15171 from clockfly/SPARK-17617.
(cherry picked from commit 3977223)
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
(cherry picked from commit 8f88412)
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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
After change
How was this patch tested?
Unit test.