wypoon commented on a change in pull request #26895: [SPARK-17398][SQL] Fix
ClassCastException when querying partitioned JSON table
URL: https://github.com/apache/spark/pull/26895#discussion_r358001919
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File path: sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala
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@@ -252,10 +254,14 @@ class HadoopTableReader(
partProps.asScala.foreach {
case (key, value) => props.setProperty(key, value)
}
- deserializer.initialize(hconf, props)
+ DeserializerLock.synchronized {
+ deserializer.initialize(hconf, props)
+ }
// get the table deserializer
val tableSerDe =
localTableDesc.getDeserializerClass.getConstructor().newInstance()
- tableSerDe.initialize(hconf, localTableDesc.getProperties)
Review comment:
Actually, the `tableSerDe` can be instantiated and initialized before the
transformation here. Then it will be done just once, instead of repeatedly for
each Hive partition.
(The same applies to the `Deserializer` for the table in `makeRDDForTable`.)
I'll make a change.
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