Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/12049#discussion_r57943784 --- 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.
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