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https://issues.apache.org/jira/browse/SPARK-32602?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Qiu Wenxiang resolved SPARK-32602.
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Resolution: Duplicate
> Data with date type are saved into hive table with wrong value '1970-01-01'
> ---------------------------------------------------------------------------
>
> Key: SPARK-32602
> URL: https://issues.apache.org/jira/browse/SPARK-32602
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Qiu Wenxiang
> Priority: Major
> Labels: correctness
>
>
> How to reproduce:
> {code:java}
> scala> spark.sql("create table t1(d date)")
> res2: org.apache.spark.sql.DataFrame = []
> scala> spark.sql("insert into table t1 values(cast('2020-08-09' as date))")
> res3: org.apache.spark.sql.DataFrame = []
> scala> spark.sql("select d from t1").show
> +----------+
> | d|
> +----------+
> |1970-01-01|
> +----------+
> {code}
>
> Spark 3.0 introduced DaysWritable which extends DateWrite from hive to handle
> date type. DaysWritable.toString() is called to write its value into hive
> table. DateWrite.toString() is defined as:
>
> {code:java}
> @Override
> public String toString() {
> // For toString, the time does not matter
> return get(false).toString();
> }
> public Date get(boolean doesTimeMatter) {
> return new Date(daysToMillis(daysSinceEpoch, doesTimeMatter));
> }
> {code}
>
> DaysWritable didn't override toString(), neither get(boolean
> doesTimeMatter)。It did override get():
> {code:java}
> override def get(): Date = new Date(DateWritable.daysToMillis(julianDays))
> {code}
> but this didn't help with toString(), so with daysSinceEpoch in DateWritable
> always as 0, calls to DaysWritable.toString() will always return
> '1970-01-01', and as a result date value stored into hive table will always
> have value '1970-01-01'。
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