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https://issues.apache.org/jira/browse/SPARK-31447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-31447:
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Assignee: Apache Spark
> DATE_PART functions produces incorrect result
> ---------------------------------------------
>
> Key: SPARK-31447
> URL: https://issues.apache.org/jira/browse/SPARK-31447
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Sathyaprakash Govindasamy
> Assignee: Apache Spark
> Priority: Minor
>
> Spark does not extract correct date part from calendar interval. Below is one
> example for extracting day from calendar interval
> {code:java}
> spark.sql("SELECT EXTRACT(DAY FROM (cast('2020-01-15 00:00:00' as timestamp)
> - cast('2020-01-01 00:00:00' as timestamp)))").show{code}
> +------------------------------------------------------------------------------------------------------------------------+
> |date_part('DAY', subtracttimestamps(CAST('2020-01-15 00:00:00' AS
> TIMESTAMP), CAST('2020-01-01 00:00:00' AS TIMESTAMP)))|
> +------------------------------------------------------------------------------------------------------------------------+
> | 0|
> +------------------------------------------------------------------------------------------------------------------------+
> Actual output 0 days
> Correct output 14 days
> This is because SubtractTimestamps expression calculates difference and
> populates only microseconds field. months and days field are set to zero
> {code:java}
> new CalendarInterval(months=0, days=0, microseconds=end.asInstanceOf[Long] -
> start.asInstanceOf[Long]){code}
> https://github.com/apache/spark/blob/2c5d489679ba3814973680d65853877664bcd931/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala#L2211
> But ExtractIntervalDays expression retrieves days information from days field
> in CalendarInterval and returns zero.
> {code:java}
> def getDays(interval: CalendarInterval): Int = {
> interval.days
> }{code}
> https://github.com/apache/spark/blob/2c5d489679ba3814973680d65853877664bcd931/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala#L73
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