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Posted to issues@spark.apache.org by "Leandro Rosa (JIRA)" <ji...@apache.org> on 2019/04/12 14:42:00 UTC
[jira] [Updated] (SPARK-27450) Timestamp cast fails when ISO8601
string omits minutes, seconds or milliseconds
[ https://issues.apache.org/jira/browse/SPARK-27450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Leandro Rosa updated SPARK-27450:
---------------------------------
Summary: Timestamp cast fails when ISO8601 string omits minutes, seconds or milliseconds (was: Timestamp cast fails when ISO8601 string omits minutes or seconds)
> Timestamp cast fails when ISO8601 string omits minutes, seconds or milliseconds
> -------------------------------------------------------------------------------
>
> Key: SPARK-27450
> URL: https://issues.apache.org/jira/browse/SPARK-27450
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.0
> Environment: Spark 2.3.x
> Reporter: Leandro Rosa
> Priority: Major
>
> ISO8601 allows to omit minutes, seconds and milliseconds.
> {quote}
> |hh:mm:ss.sss|_or_|hhmmss.sss|
> |hh:mm:ss|_or_|hhmmss|
> |hh:mm|_or_|hhmm|
> | |hh|
> {quote}
> {quote}Either the seconds, or the minutes and seconds, may be omitted from the basic or extended time formats for greater brevity but decreased accuracy: [hh]:[mm], [hh][mm] and [hh] are the resulting reduced accuracy time formats
> {quote}
> Source: [Wikipedia ISO8601|https://en.wikipedia.org/wiki/ISO_8601]
> Popular libs, such as [ZonedDateTime|https://docs.oracle.com/javase/8/docs/api/java/time/ZonedDateTime.html], respect that. However, Timestamp cast fails silently.
>
> {code:java}
> import org.apache.spark.sql.types._
> val df1 = Seq(("2017-08-01T02:33")).toDF("eventTimeString") // NON-ISO8601 (missing TZ offset) [OK]
> val new_df1 = df1
> .withColumn("eventTimeTS", col("eventTimeString").cast(TimestampType))
> new_df1.show(false)
> +----------------+-------------------+
> |eventTimeString |eventTimeTS |
> +----------------+-------------------+
> |2017-08-01T02:33|2017-08-01 02:33:00|
> +----------------+-------------------+
> {code}
> {code:java}
> val df2 = Seq(("2017-08-01T02:33Z")).toDF("eventTimeString") // ISO8601 [FAIL]
> val new_df2 = df2
> .withColumn("eventTimeTS", col("eventTimeString").cast(TimestampType))
> new_df2.show(false)
> +-----------------+-----------+
> |eventTimeString |eventTimeTS|
> +-----------------+-----------+
> |2017-08-01T02:33Z|null |
> +-----------------+-----------+
> {code}
>
> {code:java}
> val df3 = Seq(("2017-08-01T02:33-03:00")).toDF("eventTimeString") // ISO8601 [FAIL]
> val new_df3 = df3
> .withColumn("eventTimeTS", col("eventTimeString").cast(TimestampType))
> new_df3.show(false)
> +----------------------+-----------+
> |eventTimeString |eventTimeTS|
> +----------------------+-----------+
> |2017-08-01T02:33-03:00|null |
> +----------------------+-----------+
> {code}
>
>
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