Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/12049#discussion_r58478446
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/ContinuousQueryManager.scala ---
@@ -178,11 +178,19 @@ class ContinuousQueryManager(sqlContext: SQLContext) {
throw new IllegalArgumentException(
s"Cannot start query with name $name as a query with that name
is already active")
}
+ val logicalPlan = df.logicalPlan.transform {
+ case StreamingRelation(dataSource, output) =>
+ // Materialize source to avoid creating it in every batch
+ val source = dataSource.createSource()
+ // We still need to use the previous `output` instead of
`source.schema` as attributes in
+ // "_logicalPlan" has already used attributes of the previous
`output`.
--- End diff --
nit: i don't see anything named `_logicalPlan`
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