[GitHub] [spark] peter-toth commented on pull request #28953: [SPARK-32013][SQL] Support query execution before reading DataFrame and before/after writing DataFrame over JDBC

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peter-toth commented on PR #28953:
URL: https://github.com/apache/spark/pull/28953#issuecomment-1307255587

   @abhishekboga, sorry I can't test this feature with Snowflake, but I added the following simple unittest using H2 into `sql/core/src/test/scala/org/apache/spark/sql/jdbc/JDBCSuite.scala`: 
   ```
     test("SPARK-32013: option sessionInitStatement, call stored function") {
       val initSQL =
         """CREATE ALIAS NEXT_PRIME AS '
           |String nextPrime(String value) {
           |  return new BigInteger(value).nextProbablePrime().toString();
           |}';
           |INSERT INTO TEST.seq VALUES(NEXT_PRIME(1000))
           |""".stripMargin
       val df = spark.read.format("jdbc")
         .option("url", urlWithUserAndPass)
         .option("query", "SELECT * FROM TEST.seq WHERE ID > 1000")
         .option("sessionInitStatement", initSQL)
         .load()
       assert(df.collect() === Array(Row(1009)))
     }
   ```
   and it does work.


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