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[SPARK-2443][SQL] Fix slow read from partitioned tables #1408

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[SPARK-2443][SQL] Fix slow read from partitioned tables #1408

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10 changes: 7 additions & 3 deletions sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -164,13 +164,17 @@ class HadoopTableReader(@transient _tableDesc: TableDesc, @transient sc: HiveCon
hivePartitionRDD.mapPartitions { iter =>
val hconf = broadcastedHiveConf.value.value
val rowWithPartArr = new Array[Object](2)

// The update and deserializer initialization are intentionally
// kept out of the below iter.map loop to save performance.
rowWithPartArr.update(1, partValues)
val deserializer = localDeserializer.newInstance()
deserializer.initialize(hconf, partProps)

// Map each tuple to a row object
iter.map { value =>
val deserializer = localDeserializer.newInstance()
deserializer.initialize(hconf, partProps)
val deserializedRow = deserializer.deserialize(value)
rowWithPartArr.update(0, deserializedRow)
rowWithPartArr.update(1, partValues)
rowWithPartArr.asInstanceOf[Object]
}
}
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