Github user jose-torres commented on a diff in the pull request:
https://github.com/apache/spark/pull/21029#discussion_r180796522
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2ScanExec.scala
---
@@ -95,21 +77,29 @@ case class DataSourceV2ScanExec(
sparkContext.getLocalProperty(ContinuousExecution.EPOCH_COORDINATOR_ID_KEY),
sparkContext.env)
.askSync[Unit](SetReaderPartitions(readerFactories.size))
- new ContinuousDataSourceRDD(sparkContext, sqlContext,
readerFactories)
- .asInstanceOf[RDD[InternalRow]]
-
- case r: SupportsScanColumnarBatch if r.enableBatchRead() =>
- new DataSourceRDD(sparkContext,
batchReaderFactories).asInstanceOf[RDD[InternalRow]]
-
+ if (readerFactories.exists(_.dataFormat() ==
DataFormat.COLUMNAR_BATCH)) {
+ throw new IllegalArgumentException(
+ "continuous stream reader does not support columnar read yet.")
--- End diff --
Then the missing piece is codegen. This is difficult because the continuous
stream reader does a lot of auxiliary work, so I don't know if it will happen
in the near future.
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