[GitHub] [spark] maropu commented on issue #24845: [SPARK-28097][SQL] Map ByteType to SMALLINT when using JDBC with PostgreSQL

[GitBox <gi...@apache.org>]

maropu commented on issue #24845: [SPARK-28097][SQL] Map ByteType to SMALLINT when using JDBC with PostgreSQL
URL: https://github.com/apache/spark/pull/24845#issuecomment-507929409
 
 
   `PostgresIntegrationSuite` can run `(DF → JDBC)` tests easily like this;
   ```
     test("write byte as smallint") {
       sqlContext.createDataFrame(Seq((1.toByte, 2.toShort)))
         .write.jdbc(jdbcUrl, "byte_to_smallint_test", new Properties)
       val df = sqlContext.read.jdbc(jdbcUrl, "byte_to_smallint_test", new Properties)
       val schema = df.schema
       assert(schema(0).dataType == ShortType)
       assert(schema(1).dataType == ShortType)
       val rows = df.collect()
       assert(rows.length === 1)
       assert(rows(0).getShort(0) === 1)
       assert(rows(0).getShort(1) === 2)
     }
   ```

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