Scala examples for stored procedures created with SQL¶

Using Snowpark APIs for asynchronous processing¶

The following examples illustrate how you can use Snowpark APIs to begin asynchronous child jobs, as well as how those jobs behave under different conditions.

In the following example, the asyncWait procedure executes an asynchronous child job that waits 10 seconds.

CREATE OR REPLACE PROCEDURE asyncWait()
  RETURNS VARCHAR
  LANGUAGE SCALA
  RUNTIME_VERSION = 2.12
  PACKAGES = ('com.snowflake:snowpark_2.12:latest')
  HANDLER = 'TestScalaSP.asyncBasic'
  AS
  $$
  import com.snowflake.snowpark._
  object TestScalaSP {
    def asyncBasic(session: com.snowflake.snowpark.Session): String = {
      val df = session.sql("select system$wait(10)")
      val asyncJob = df.async.collect()
      while(!asyncJob.isDone()) {
        Thread.sleep(1000)
      }
      "Done"
    }
  }
  $$;
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CALL asyncWait();
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In the following example, the cancelJob procedure uses SQL to start a job that would take 10 seconds to finish. It then cancels the child job before it finishes.

CREATE OR REPLACE PROCEDURE cancelJob()
  RETURNS VARCHAR
  LANGUAGE SCALA
  RUNTIME_VERSION = 2.12
  PACKAGES = ('com.snowflake:snowpark_2.12:latest')
  HANDLER = 'TestScalaSP.asyncBasic'
  AS
  $$
  import com.snowflake.snowpark._
  object TestScalaSP {
    def asyncBasic(session: com.snowflake.snowpark.Session): String = {
      val df = session.sql("select system$wait(10)")
      val asyncJob = df.async.collect()
      asyncJob.cancel()
      "Done"
    }
  }
  $$;
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In the following example, the checkStatus procedure executes an asynchronous child job that waits 10 seconds. The procedure then checks on the status of the job before it finishes, so the check returns False.

CREATE OR REPLACE PROCEDURE checkStatus()
  RETURNS VARCHAR
  LANGUAGE SCALA
  RUNTIME_VERSION = 2.12
  PACKAGES = ('com.snowflake:snowpark_2.12:latest')
  HANDLER = 'TestScalaSP.asyncBasic'
  AS
  $$
  import java.sql.ResultSet
  import net.snowflake.client.jdbc.{SnowflakeConnectionV1, SnowflakeResultSet, SnowflakeStatement}
  object TestScalaSP {
    def asyncBasic(session: com.snowflake.snowpark.Session): String = {
      val connection = session.jdbcConnection
      val stmt = connection.createStatement()
      val rs = stmt.asInstanceOf[SnowflakeStatement].executeAsyncQuery("CALL SYSTEM$WAIT(10)")
      val status = rs.asInstanceOf[SnowflakeResultSet].getStatus.toString
      s"""status:    ${status}"""
    }
  }
  $$;
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