Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/17444#discussion_r108311230
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/BatchCommitLog.scala
---
@@ -45,33 +45,39 @@ import org.apache.spark.sql.SparkSession
class BatchCommitLog(sparkSession: SparkSession, path: String)
extends HDFSMetadataLog[String](sparkSession, path) {
+ import BatchCommitLog._
+
+ def add(batchId: Long): Unit = {
+ super.add(batchId, EMPTY_JSON)
+ }
+
+ override def add(batchId: Long, metadata: String): Boolean = {
+ throw new UnsupportedOperationException(
--- End diff --
What if we want metadata down the road? What's the problem with supporting
this for cases other than null?
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