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https://issues.apache.org/jira/browse/SPARK-15491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15298629#comment-15298629
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Huaxin Gao commented on SPARK-15491:
------------------------------------
It seems to me that the problem is because JDBCRelation has two sets of
constructor parameters (first set: url, table, parts, properties. 2nd set:
sparkSession). If I change it to use only one set of parameter (url, table,
parts, properties, sparkSession), then p.productIterator.toSeq will give 5
parameters instead of 4.
I referenced the usage of JDBCRelation, I didn't see any usage of partial
function, though. I guess it's intended for future usage.
I will work on the fix. I will try to find a way to get the fieldvalues for all
the constructor parameters (instead of using p.productIterator.toSeq which
only gives the first level of constructor parameters)
> JSON serialization fails for JDBC DataFrames
> --------------------------------------------
>
> Key: SPARK-15491
> URL: https://issues.apache.org/jira/browse/SPARK-15491
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Environment: MacOS 10.11.5, Spark 2.0.0-preview
> Reporter: Marc Prud'hommeaux
>
> The TreeNode.toJSON feature implemented in SPARK-12321 fails with an
> assertion error on DataFrames that use JDBC in spark 2.0.0-preview:
> {code}
> scala>
> sqlContext.read.json("examples/src/main/resources/people.json").select("name",
> "age").agg(avg("age"), count("name")).filter(avg("age") >
> 10).queryExecution.logical.toJSON
> res113: String =
> [{"class":"org.apache.spark.sql.catalyst.plans.logical.Filter","num-children":1,"condition":[{"class":"org.apache.spark.sql.catalyst.expressions.GreaterThan","num-children":2,"left":0,"right":1},{"class":"org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression","num-children":1,...
> scala> sqlContext.read.format("jdbc").options(db + ("dbtable" ->
> "categories")).load().queryExecution.logical.simpleString
> res120: String = Relation[category#2148,categoryname#2149]
> JDBCRelation(categories)
> scala> sqlContext.read.format("jdbc").options(db + ("dbtable" ->
> "categories")).load().queryExecution.logical.toJSON
> java.lang.AssertionError: assertion failed
> at scala.Predef$.assert(Predef.scala:156)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode.org$apache$spark$sql$catalyst$trees$TreeNode$$parseToJson(TreeNode.scala:598)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$jsonFields$2.apply(TreeNode.scala:562)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$jsonFields$2.apply(TreeNode.scala:553)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
> at
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
> at scala.collection.immutable.List.foreach(List.scala:381)
> at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
> at scala.collection.immutable.List.map(List.scala:285)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode.jsonFields(TreeNode.scala:553)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode.org$apache$spark$sql$catalyst$trees$TreeNode$$collectJsonValue$1(TreeNode.scala:538)
> at
> org.apache.spark.sql.catalyst.trees.TreeNode.jsonValue(TreeNode.scala:543)
> at org.apache.spark.sql.catalyst.trees.TreeNode.toJSON(TreeNode.scala:529)
> ... 48 elided
> {code}
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