cloud-fan commented on a change in pull request #23702: [SPARK-26785][SQL] data
source v2 API refactor: streaming write
URL: https://github.com/apache/spark/pull/23702#discussion_r257453861
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/MicroBatchExecution.scala
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@@ -513,13 +514,16 @@ class MicroBatchExecution(
val triggerLogicalPlan = sink match {
case _: Sink => newAttributePlan
- case s: StreamingWriteSupportProvider =>
- val writer = s.createStreamingWriteSupport(
- s"$runId",
- newAttributePlan.schema,
- outputMode,
- new DataSourceOptions(extraOptions.asJava))
- WriteToDataSourceV2(new MicroBatchWrite(currentBatchId, writer),
newAttributePlan)
+ case s: SupportsStreamingWrite =>
+ // TODO: we should translate OutputMode to concrete write actions like
truncate, but
+ // the truncate action is being developed in SPARK-26666.
Review comment:
I'm not very familiar with streaming internals so I don't know what's the
exact semantic of this UPDATE mode.
I believe we can treat it as `SaveMode`: replace it with the new write
operators(Append, Truncate, OverwriteByExpression, etc.) and make the semantic
clear.
Anyway this is just a TODO comment, we can have more discussion in the PR
that address this TODO.
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