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https://issues.apache.org/jira/browse/SPARK-41266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17643212#comment-17643212
]
Laurens Versluis commented on SPARK-41266:
------------------------------------------
Hi [~huldar] I get a different output:
{noformat}
Input data (singleCol):
+-------------------+
|starttime |
+-------------------+
|2019-08-11 19:33:05|
+-------------------+
singleCol.filter("starttime = '2019-08-11 19:33:05'").show();
+-------------------+
| starttime|
+-------------------+
|2019-08-11 19:33:05|
+-------------------+
singleCol.filter("starttime = '2019-08-11T19:33:05Z'").show();
+-------------------+
| starttime|
+-------------------+
|2019-08-11 19:33:05|
+-------------------+
singleCol.filter("starttime = '2019-08-11T19:33:05Z'").show();
+-------------------+
| starttime|
+-------------------+
|2019-08-11 19:33:05|
+-------------------+
singleCol.filter("starttime IN ('2019-08-11 19:33:05')").show();
+-------------------+
| starttime|
+-------------------+
|2019-08-11 19:33:05|
+-------------------+
singleCol.filter("starttime IN ('2019-08-11T19:33:05Z')").show();
+---------+
|starttime|
+---------+
+---------+
singleCol.filter("starttime IN (to_timestamp('2019-08-11T19:33:05Z'))").show();
+-------------------+
| starttime|
+-------------------+
|2019-08-11 19:33:05|
+-------------------+{noformat}
> Spark does not parse timestamp strings when using the IN operator
> -----------------------------------------------------------------
>
> Key: SPARK-41266
> URL: https://issues.apache.org/jira/browse/SPARK-41266
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.1
> Environment: Windows 10, Spark 3.2.1 with Java 11
> Reporter: Laurens Versluis
> Priority: Major
>
> Likely affects more versions, tested only with 3.2.1.
>
> Summary:
> Spark will convert a timestamp string to a timestamp when using the equal
> operator (=), yet won't do this when using the IN operator.
>
> Details:
> While debugging an issue why we got no results on a query, we found out that
> when using the equal symbol `=` in the WHERE clause combined with a
> TimeStampType column that Spark will convert the string to a timestamp and
> filter.
> However, when using the IN operator (our query), it will not do so, and
> perform a cast to string. We expected the behavior to be similar, or at least
> that Spark realizes the IN clause operates on a TimeStampType column and thus
> attempts to convert to timestamp first before falling back to string
> comparison.
>
> *Minimal reproducible example:*
> Suppose we have a one-line dataset with the follow contents and schema:
>
> {noformat}
> +----------------------------+
> |starttime |
> +----------------------------+
> |2019-08-11 19:33:05 |
> +----------------------------+
> root
> |-- starttime: timestamp (nullable = true){noformat}
> Then if we fire the following queries, we will not get results for the
> IN-clause one using a timestamp string with timezone information:
>
>
> {code:java}
> // Works - Spark casts the argument to a string and the internal
> representation of the time seems to match it...
> singleCol.filter("starttime IN ('2019-08-11 19:33:05')").show();
> // Works
> singleCol.filter("starttime = '2019-08-11 19:33:05'").show();
> // Works
> singleCol.filter("starttime = '2019-08-11T19:33:05Z'").show();
> // Doesn't work
> singleCol.filter("starttime IN ('2019-08-11T19:33:05Z')").show();
> //Works
> singleCol.filter("starttime IN
> (to_timestamp('2019-08-11T19:33:05Z'))").show(); {code}
>
> We can see from the output that a cast to string is taking place:
> {noformat}
> [...] isnotnull(starttime#59),(cast(starttime#59 as string) = 2019-08-11
> 19:33:05){noformat}
> Since the = operator does work, it would be consistent if operators such as
> the IN operator would have similar, consistent behavior.
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