[
https://issues.apache.org/jira/browse/SPARK-31797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
JinxinTang updated SPARK-31797:
-------------------------------
Description: (was: ### What changes were proposed in this pull request?
Add and register three new functions: `TIMESTAMP_SECONDS`, `TIMESTAMP_MILLIS`
and `TIMESTAMP_MICROS`
A test is added.
Reference:
[BigQuery](https://cloud.google.com/bigquery/docs/reference/standard-sql/timestamp_functions?hl=en#timestamp_seconds)
### Why are the changes needed?
People will have convenient way to get timestamps from seconds,milliseconds and
microseconds.
### Does this PR introduce _any_ user-facing change?
Yes, people will have the following ways to get timestamp:
```scala
sql("select TIMESTAMP_SECONDS(t.a) as timestamp from
values(1230219000),(-1230219000) as t(a)").show(false)
```
```
+-------------------------+
|timestamp |
+-------------------------+
|2008-12-25 23:30:00|
|1931-01-07 16:30:00|
+-------------------------+
```
```scala
sql("select TIMESTAMP_MILLIS(t.a) as timestamp from
values(1230219000123),(-1230219000123) as t(a)").show(false)
```
```
+-------------------------------+
|timestamp |
+-------------------------------+
|2008-12-25 23:30:00.123|
|1931-01-07 16:29:59.877|
+-------------------------------+
```
```scala
sql("select TIMESTAMP_MICROS(t.a) as timestamp from
values(1230219000123123),(-1230219000123123) as t(a)").show(false)
```
```
+------------------------------------+
|timestamp |
+------------------------------------+
|2008-12-25 23:30:00.123123|
|1931-01-07 16:29:59.876877|
+------------------------------------+
```
### How was this patch tested?
Unit test.)
> Adds TIMESTAMP_SECONDS, TIMESTAMP_MILLIS and TIMESTAMP_MICROS functions
> -----------------------------------------------------------------------
>
> Key: SPARK-31797
> URL: https://issues.apache.org/jira/browse/SPARK-31797
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.1.0
> Environment: [PR link|https://github.com/apache/spark/pull/28534]
> Reporter: JinxinTang
> Priority: Major
> Labels: features
> Fix For: 3.1.0
>
>
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