shivsood commented on a change in pull request #26301: [SPARK-29644] [SQL]
Corrected ShortType and ByteType mapping to SmallInt and TinyInt in JDBCUtils
URL: https://github.com/apache/spark/pull/26301#discussion_r345536780
##########
File path:
external/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/MsSqlServerIntegrationSuite.scala
##########
@@ -202,4 +202,46 @@ class MsSqlServerIntegrationSuite extends
DockerJDBCIntegrationSuite {
df2.write.jdbc(jdbcUrl, "datescopy", new Properties)
df3.write.jdbc(jdbcUrl, "stringscopy", new Properties)
}
+
+ test("SPARK-29644: Write tables with ShortType") {
+ import testImplicits._
+ val df = Seq(-32768.toShort, 0.toShort, 1.toShort, 38.toShort,
32768.toShort).toDF("a")
+ val tablename = "shorttable"
+ df.write
+ .format("jdbc")
+ .mode("overwrite")
+ .option("url", jdbcUrl)
+ .option("dbtable", tablename)
+ .save()
+ val df2 = spark.read
+ .format("jdbc")
+ .option("url", jdbcUrl)
+ .option("dbtable", tablename)
+ .load()
+ assert(df.count == df2.count)
+ val rows = df2.collect()
+ val colType = rows(0).toSeq.map(x => x.getClass.toString)
+ assert(colType(0) == "class java.lang.Short")
+ }
+
+ test("SPARK-29644: Write tables with ByteType") {
Review comment:
I think both test have their important purpose. JDBCWriteSuite unit test
will catch any spark regression in CI/CD and integration test are great to
ensure that functionality works end to end. Consider that ByteType should
translate to TINYINT in SQLServer, but in PostGres both ByteType maps to
SMALLINT. This real distinction is factually verified in Integration test. So i
think having integration test is very important and thus we should not remove
these.
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