GitHub user 10110346 opened a pull request:
https://github.com/apache/spark/pull/17698
[SPARK-20403][SQL][Documentation]Modify the instructions of some functions,
and add instructions of 'cast' function
## What changes were proposed in this pull request?
1. ââhashSetâ and âhashMapâ are mutable,so,using 'val' will be
better;
2. modify annotation:HALF_UP -> HALF_EVEN
3. add instructions of 'cast' function When using 'show functions'
and 'desc function cast'
command in spark-sql
4. Modify the instructions of functionsï¼such as
booleanï¼tinyintï¼smallintï¼intï¼bigintï¼floatï¼doubleï¼decimalï¼dateï¼timestampï¼binaryï¼string
## How was this patch tested?
Before modificationï¼
spark-sql>desc function boolean;
Function: boolean
Class: org.apache.spark.sql.catalyst.expressions.Cast
Usage: boolean(expr AS type) - Casts the value `expr` to the target data
type `type`.
After modificationï¼
spark-sql> desc function boolean;
Function: boolean
Class: org.apache.spark.sql.catalyst.expressions.CastAlias
Usage: boolean(expr) - Casts the value `expr` to the target data type
`boolean`.
spark-sql> desc function cast
Function: cast
Class: org.apache.spark.sql.catalyst.expressions.Cast
Usage: cast(expr AS type) - Casts the value `expr` to the target data type
`type`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/10110346/spark wip_lx_0418
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17698.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 #17698
----
commit 11ca517e75d0ce800037557b180fdabb81c9e554
Author: liuxian <[email protected]>
Date: 2017-04-18T11:53:45Z
hashSet and hashMap are mutable,so,using val will be better
Signed-off-by: liuxian <[email protected]>
commit c3dcefa02c36de8d6055e7166379391b01337cda
Author: liuxian <[email protected]>
Date: 2017-04-18T12:07:50Z
modify annotation:HALF_UP -> HALF_EVEN
Signed-off-by: liuxian <[email protected]>
commit c56507c3b99744d64d539dd105e5615abaf6a917
Author: liuxian <[email protected]>
Date: 2017-04-20T02:56:30Z
add 'cast' function When using 'show functions' and 'desc function cast'
command in spark-sql
Signed-off-by: liuxian <[email protected]>
commit 62a29bf16c359dac040c2e089c4bcfae417ed2e9
Author: liuxian <[email protected]>
Date: 2017-04-20T03:05:53Z
Modify the usage of functionsï¼such as
booleanï¼tinyintï¼smallintï¼intï¼bigintï¼floatï¼doubleï¼decimalï¼dateï¼timestampï¼binaryï¼string
Signed-off-by: liuxian <[email protected]>
----
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