Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/12049#discussion_r57973689
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -71,9 +71,18 @@ class StreamExecution(
/** The current batchId or -1 if execution has not yet been initialized.
*/
private var currentBatchId: Long = -1
+ private[sql] val logicalPlan = _logicalPlan.transform {
+ case StreamingRelation(sourceCreator, output) =>
+ // Materialize source to avoid creating it in every batch
+ val source = sourceCreator()
+ // We still need to use the previous `output` instead of
`source.schema` as attributes in
+ // "_logicalPlan" has already used attributes of the previous
`output`.
+ StreamingRelation(() => source, output)
--- End diff --
> I think its confusing to have an opaque function that sometimes is
creating a source and sometimes returning a static source. Its not going to be
clear from explain() which mode you are in.
How about adding a new Relation for a static source (maybe call it
StreamExecutionRelation)?
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