[jira] [Created] (SPARK-26330) Duplicate query execution events generated for SQL commands

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-26330:
--------------------------------------

             Summary: Duplicate query execution events generated for SQL commands
                 Key: SPARK-26330
                 URL: https://issues.apache.org/jira/browse/SPARK-26330
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Marcelo Vanzin


Consider the following code:
{code:java}
spark.sql("create table foo (bar int)").show()
{code}
The command is executed eagerly (i.e. before {{show()}} is called) and generates a query execution event. But when you call {{show()}}, a duplicate event is generated, even though Spark does not execute anything at that point.

This can be a little more misleading when you do something like a CTAS, since the duplicate events may cause listeners to think there were multiple inserts when that's not true.

A fuller example that shows this (and you can look at the output that both inputs to the listener are the same):
{code:java}
import org.apache.spark.sql.execution.QueryExecution
import org.apache.spark.sql.util.QueryExecutionListener

val lsnr = new QueryExecutionListener() {
  override def onSuccess(funcName: String, qe: QueryExecution, durationNs: Long): Unit = {
    println(s"on success: $funcName -> ${qe.analyzed}")
  }

  override def onFailure(funcName: String, qe: QueryExecution, exception: Exception): Unit = {
    println(s"on failure: $funcName -> ${qe.analyzed}")
  }
}

spark.sessionState.listenerManager.register(lsnr)

spark.sql("drop table if exists test")
val df = spark.sql("create table test(i int)")
df.show()
{code}



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org