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

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

Burak Yavuz created SPARK-31178:
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             Summary: 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


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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