Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/11030#discussion_r51642445
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/memory.scala
---
@@ -110,6 +117,7 @@ class MemorySink(schema: StructType) extends Sink with
Logging {
}
override def addBatch(nextBatch: Batch): Unit = synchronized {
+ nextBatch.data.collect() // 'compute' the batch's data and record the
batch
--- End diff --
This is to force the memory sink to compute the batch and throw error if
the computation is supposed to.
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