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https://issues.apache.org/jira/browse/SPARK-38230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17736041#comment-17736041
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ASF GitHub Bot commented on SPARK-38230:
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User 'jeanlyn' has created a pull request for this issue:
https://github.com/apache/spark/pull/41628

> InsertIntoHadoopFsRelationCommand unnecessarily fetches details of partitions 
> in most cases
> -------------------------------------------------------------------------------------------
>
>                 Key: SPARK-38230
>                 URL: https://issues.apache.org/jira/browse/SPARK-38230
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.2, 3.3.0, 3.4.0, 3.5.0
>            Reporter: Coal Chan
>            Priority: Major
>
> In 
> `org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand`,
>  `sparkSession.sessionState.catalog.listPartitions` will call method 
> `org.apache.hadoop.hive.metastore.listPartitionsPsWithAuth` of hive metastore 
> client, this method will produce multiple queries per partition on hive 
> metastore db. So when you insert into a table which has too many 
> partitions(ie: 10k), it will produce too many queries on hive metastore 
> db(ie: n * 10k = 10nk), it puts a lot of strain on the database.
> In fact, it calls method `listPartitions` in order to get locations of 
> partitions and get `customPartitionLocations`. But in most cases, we do not 
> have custom partitions, we can just get partition names, so we can call 
> methodĀ listPartitionNames.



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