Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/15949#discussion_r89230473
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala
---
@@ -25,19 +25,43 @@ import scala.collection.mutable.ArrayBuffer
import scala.util.control.NonFatal
import org.apache.hadoop.fs.Path
+import org.json4s.NoTypeHints
+import org.json4s.jackson.Serialization
import org.apache.spark.internal.Logging
import org.apache.spark.sql._
import org.apache.spark.sql.catalyst.encoders.RowEncoder
-import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap}
+import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeMap,
CurrentBatchTimestamp, CurrentDate, CurrentTimestamp}
import org.apache.spark.sql.catalyst.plans.logical.{LocalRelation,
LogicalPlan}
import org.apache.spark.sql.catalyst.util._
import org.apache.spark.sql.execution.{QueryExecution, SparkPlan}
import org.apache.spark.sql.execution.command.ExplainCommand
import org.apache.spark.sql.streaming._
+import org.apache.spark.sql.types.{DateType, TimestampType}
import org.apache.spark.util.{Clock, UninterruptibleThread, Utils}
/**
+ * Contains metadata associated with a stream execution. This information
is
+ * persisted to the offset log via the OffsetSeq metadata field. Current
+ * information contained in this object includes:
+ *
+ * 1. currentEventTimeWatermark: The current eventTime watermark, used to
+ * bound the lateness of data that will processed. Time unit: milliseconds
+ * 2. currentBatchTimestamp: The current batch processing timestamp.
--- End diff --
nit: Use Scala doc: `@param currentEventTimeWatermarkMillis ...`
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