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https://issues.apache.org/jira/browse/SPARK-30688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031614#comment-17031614
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Attila Zsolt Piros commented on SPARK-30688:
--------------------------------------------
I have checked on Spark 3.0.0-preview2 and week in year fails there too:
{noformat}
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 3.0.0-preview2
/_/
Using Scala version 2.12.10 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_202)
Type in expressions to have them evaluated.
Type :help for more information.
scala> spark.sql("select unix_timestamp('20201', 'yyyyww')").show();
+-----------------------------+
|unix_timestamp(20201, yyyyww)|
+-----------------------------+
| null|
+-----------------------------+
{noformat}
As you can see it fails for even a simpler pattern too:
{noformat}
scala> spark.sql("select unix_timestamp('2020-10', 'yyyy-ww')").show();
+--------------------------------+
|unix_timestamp(2020-10, yyyy-ww)|
+--------------------------------+
| null|
+--------------------------------+
{noformat}
But this strangely works:
{noformat}
scala> spark.sql("select unix_timestamp('2020-01', 'yyyy-ww')").show();
+--------------------------------+
|unix_timestamp(2020-01, yyyy-ww)|
+--------------------------------+
| 1577833200|
+--------------------------------+
{noformat}
> Spark SQL Unix Timestamp produces incorrect result with unix_timestamp UDF
> --------------------------------------------------------------------------
>
> Key: SPARK-30688
> URL: https://issues.apache.org/jira/browse/SPARK-30688
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.2
> Reporter: Rajkumar Singh
> Priority: Major
>
>
> {code:java}
> scala> spark.sql("select unix_timestamp('20201', 'yyyyww')").show();
> +-----------------------------+
> |unix_timestamp(20201, yyyyww)|
> +-----------------------------+
> | null|
> +-----------------------------+
>
> scala> spark.sql("select unix_timestamp('20202', 'yyyyww')").show();
> -----------------------------+
> |unix_timestamp(20202, yyyyww)|
> +-----------------------------+
> | 1578182400|
> +-----------------------------+
>
> {code}
>
>
> This seems to happen for leap year only, I dig deeper into it and it seems
> that Spark is using the java.text.SimpleDateFormat and try to parse the
> expression here
> [org.apache.spark.sql.catalyst.expressions.UnixTime#eval|https://github.com/hortonworks/spark2/blob/49ec35bbb40ec6220282d932c9411773228725be/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala#L652]
> {code:java}
> formatter.parse(
> t.asInstanceOf[UTF8String].toString).getTime / 1000L{code}
> but fail and SimpleDateFormat unable to parse the date throw Unparseable
> Exception but Spark handle it silently and returns NULL.
>
> *Spark-3.0:* I did some tests where spark no longer using the legacy
> java.text.SimpleDateFormat but java date/time API, it seems date/time API
> expect a valid date with valid format
> org.apache.spark.sql.catalyst.util.Iso8601TimestampFormatter#parse
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