Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/17302#discussion_r107398418
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/object.scala
---
@@ -41,7 +41,20 @@ object CatalystSerde {
}
def generateObjAttr[T : Encoder]: Attribute = {
- AttributeReference("obj", encoderFor[T].deserializer.dataType,
nullable = false)()
+ val deserializer = encoderFor[T].deserializer
+ val dataType = deserializer.dataType
+ val nullable = if (deserializer.resolved) {
+ deserializer.nullable
+ } else {
+ // Since deserializer is not resolved here, cannot access
deserializer.nullable.
--- End diff --
This happens in the following calling context thru `ExternalRDD.apply`.
```java
at
org.apache.spark.sql.catalyst.plans.logical.CatalystSerde$.generateObjAttr(object.scala:61)
at
org.apache.spark.sql.execution.ExternalRDD$.apply(ExistingRDD.scala:73)
at
org.apache.spark.sql.SparkSession.createDataset(SparkSession.scala:471)
at org.apache.spark.sql.SQLContext.createDataset(SQLContext.scala:393)
at
org.apache.spark.sql.SQLImplicits.rddToDatasetHolder(SQLImplicits.scala:238)
at
org.apache.spark.sql.Agg$$anonfun$18$$anonfun$apply$mcV$sp$4.apply$mcV$sp(MySuite.scala:202)
at
org.apache.spark.sql.test.SQLTestUtils$class.withSQLConf(SQLTestUtils.scala:106)
at org.apache.spark.sql.Agg.withSQLConf(MySuite.scala:168)
at org.apache.spark.sql.Agg$$anonfun$18.apply$mcV$sp(MySuite.scala:193)
at org.apache.spark.sql.Agg$$anonfun$18.apply(MySuite.scala:193)
at org.apache.spark.sql.Agg$$anonfun$18.apply(MySuite.scala:193)
```
[Here](https://github.com/apache/spark/pull/17302#discussion_r107345571) is
a thread regarding resolution of `deserializer`.
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