Github user chutium commented on a diff in the pull request:
https://github.com/apache/spark/pull/1612#discussion_r15451376
--- Diff: core/src/main/scala/org/apache/spark/rdd/JdbcRDD.scala ---
@@ -67,6 +69,28 @@ class JdbcRDD[T: ClassTag](
}).toArray
}
+ def getSchema: Seq[(String, Int, Boolean)] = {
--- End diff --
here i tried to return a java.sql.ResultSetMetaData object, then build the
Seq[(String, Int, Boolean)] for schemaRDD in Spark SQL scope, but when i run
this SchemaRDD, i got "java.io.NotSerializableException:
org.postgresql.jdbc4.Jdbc4ResultSetMetaData"
so i let this method return a Seq[(String, Int, Boolean)], and in Spark SQL
scope, create Seq[StructField] from this Seq[(String, Int, Boolean)]
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