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zuotingbing dc3713cca2 [SPARK-24829][STS] In Spark Thrift Server, CAST AS FLOAT inconsistent with spark-shell or spark-sql 
## What changes were proposed in this pull request?

SELECT CAST('4.56' AS FLOAT)

the result is 4.559999942779541

![2018-07-18_110944](https://user-images.githubusercontent.com/24823338/42857199-7c6783da-8a7b-11e8-8c69-1e9302102525.png)

 it should be 4.56 as same as in spark-shell or spark-sql.

![2018-07-18_111111](https://user-images.githubusercontent.com/24823338/42857210-80c89e96-8a7b-11e8-9f8c-de1a79a73752.png)

## How was this patch tested?

add unit tests

Author: zuotingbing <zuo.tingbing9@zte.com.cn>

Closes #21789 from zuotingbing/SPARK-24829.
2018-07-27 13:27:17 +08:00
..
if [MINOR][MLLIB][STREAMING][SQL] Fix typos 2016-05-25 10:53:57 -07:00
src [SPARK-24829][STS] In Spark Thrift Server, CAST AS FLOAT inconsistent with spark-shell or spark-sql 2018-07-27 13:27:17 +08:00
pom.xml [SPARK-23028] Bump master branch version to 2.4.0-SNAPSHOT 2018-01-13 00:37:59 +08:00