GitHub user heary-cao opened a pull request:
https://github.com/apache/spark/pull/18016
Improve ceil handle the value which is not expected
## What changes were proposed in this pull request?
spark-sql>SELECT ceil(1234567890123456);
1234567890123456
spark-sql>SELECT ceil(12345678901234567);
12345678901234568
spark-sql>SELECT ceil(123456789012345678);
123456789012345680
when the length of the getText is greater than 16. long to double will be
precision loss.
but mysql handle the value is ok.
mysql> SELECT ceil(1234567890123456);
+------------------------+
| ceil(1234567890123456) |
+------------------------+
| 1234567890123456 |
+------------------------+
1 row in set (0.00 sec)
mysql> SELECT ceil(12345678901234567);
+-------------------------+
| ceil(12345678901234567) |
+-------------------------+
| 12345678901234567 |
+-------------------------+
1 row in set (0.00 sec)
mysql> SELECT ceil(123456789012345678);
+--------------------------+
| ceil(123456789012345678) |
+--------------------------+
| 123456789012345678 |
+--------------------------+
1 row in set (0.00 sec)
## How was this patch tested?
Supplement the unit test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/heary-cao/spark ceil_long
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18016.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18016
----
commit 226d2996098f5976aa29426cd6db3997abaa3aac
Author: caoxuewen <[email protected]>
Date: 2017-05-17T10:29:38Z
Improve ceil handle the value which is not expected
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