Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16113#discussion_r90743078
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/streaming/StreamingQuery.scala ---
@@ -32,21 +32,33 @@ import org.apache.spark.sql.SparkSession
trait StreamingQuery {
/**
- * Returns the name of the query. This name is unique across all active
queries. This can be
- * set in the `org.apache.spark.sql.streaming.DataStreamWriter` as
- * `dataframe.writeStream.queryName("query").start()`.
+ * Returns the user-specified name of the query, or null if not
specified.
+ * This name can be specified in the
`org.apache.spark.sql.streaming.DataStreamWriter`
+ * as `dataframe.writeStream.queryName("query").start()`.
+ * This name, if set, must be unique across all active queries.
*
* @since 2.0.0
*/
def name: String
/**
- * Returns the unique id of this query.
+ * Returns the unique id of this query that persists across restarts
from checkpoint data.
+ * That is, this id is generated when a query is started for the first
time, and
+ * will be the same every time it is restarted from checkpoint data.
+ * There can only be one query with the same id active in a Spark
cluster.
--- End diff --
I will just remove that line then.
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