[jira] [Commented] (SPARK-31178) sql("INSERT INTO v2DataSource ...").collect() double inserts

["Burak Yavuz (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-31178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17061292#comment-17061292 ] 

Burak Yavuz commented on SPARK-31178:
-------------------------------------

cc [~wenchen] [~rdblue]

> sql("INSERT INTO v2DataSource ...").collect() double inserts
> ------------------------------------------------------------
>
>                 Key: SPARK-31178
>                 URL: https://issues.apache.org/jira/browse/SPARK-31178
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Burak Yavuz
>            Priority: Blocker
>
> The following unit test fails in DataSourceV2SQLSuite:
> {code:java}
> test("do not double insert on INSERT INTO collect()") {
>   import testImplicits._
>   val t1 = s"${catalogAndNamespace}tbl"
>   sql(s"CREATE TABLE $t1 (id bigint, data string) USING $v2Format")
>   val tmpView = "test_data"
>   val df = Seq((1L, "a"), (2L, "b"), (3L, "c")).toDF("id", "data")
>   df.createOrReplaceTempView(tmpView)
>   sql(s"INSERT INTO TABLE $t1 SELECT * FROM $tmpView").collect()
>   verifyTable(t1, df)
> } {code}
> The INSERT INTO is double inserting when ".collect()" is called. I think this is because the V2 SparkPlans are not commands, and doExecute on a Spark plan can be called multiple times causing data to be inserted multiple times.



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