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https://issues.apache.org/jira/browse/SPARK-29295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17057283#comment-17057283
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Dongjoon Hyun commented on SPARK-29295:
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I confirmed that Apache Spark 2.1.3 and older versions have no problem.
> Duplicate result when dropping partition of an external table and then
> overwriting
> ----------------------------------------------------------------------------------
>
> Key: SPARK-29295
> URL: https://issues.apache.org/jira/browse/SPARK-29295
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.3, 2.3.4, 2.4.4
> Reporter: feiwang
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: correctness
> Fix For: 3.0.0
>
>
> When we drop a partition of a external table and then overwrite it, if we set
> CONVERT_METASTORE_PARQUET=true(default value), it will overwrite this
> partition.
> But when we set CONVERT_METASTORE_PARQUET=false, it will give duplicate
> result.
> Here is a reproduce code below(you can add it into SQLQuerySuite in hive
> module):
> {code:java}
> test("spark gives duplicate result when dropping a partition of an external
> partitioned table" +
> " firstly and they overwrite it") {
> withTable("test") {
> withTempDir { f =>
> sql("create external table test(id int) partitioned by (name string)
> stored as " +
> s"parquet location '${f.getAbsolutePath}'")
> withSQLConf(HiveUtils.CONVERT_METASTORE_PARQUET.key ->
> false.toString) {
> sql("insert overwrite table test partition(name='n1') select 1")
> sql("ALTER TABLE test DROP PARTITION(name='n1')")
> sql("insert overwrite table test partition(name='n1') select 2")
> checkAnswer( sql("select id from test where name = 'n1' order by
> id"),
> Array(Row(1), Row(2)))
> }
> withSQLConf(HiveUtils.CONVERT_METASTORE_PARQUET.key -> true.toString)
> {
> sql("insert overwrite table test partition(name='n1') select 1")
> sql("ALTER TABLE test DROP PARTITION(name='n1')")
> sql("insert overwrite table test partition(name='n1') select 2")
> checkAnswer( sql("select id from test where name = 'n1' order by
> id"),
> Array(Row(2)))
> }
> }
> }
> }
> {code}
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