Jacek Laskowski created SPARK-27977:
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Summary: MicroBatchWriter should use StreamWriter for
human-friendly textual representation (toString)
Key: SPARK-27977
URL: https://issues.apache.org/jira/browse/SPARK-27977
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 2.4.3
Reporter: Jacek Laskowski
The following is a extended explain for a streaming query:
{code}
== Parsed Logical Plan ==
WriteToDataSourceV2
org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
+- Project [value#39 AS value#0]
+- Streaming RelationV2 socket[value#39] (Options:
[host=localhost,port=8888])
== Analyzed Logical Plan ==
WriteToDataSourceV2
org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
+- Project [value#39 AS value#0]
+- Streaming RelationV2 socket[value#39] (Options:
[host=localhost,port=8888])
== Optimized Logical Plan ==
WriteToDataSourceV2
org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
+- Streaming RelationV2 socket[value#39] (Options: [host=localhost,port=8888])
== Physical Plan ==
WriteToDataSourceV2
org.apache.spark.sql.execution.streaming.sources.MicroBatchWriter@4737caef
+- *(1) Project [value#39]
+- *(1) ScanV2 socket[value#39] (Options: [host=localhost,port=8888])
{code}
As you may have noticed, {{WriteToDataSourceV2}} is followed by the internal
representation of {{MicroBatchWriter}} that is a mere adapter for
{{StreamWriter}}, e.g. {{ConsoleWriter}}.
It'd be more debugging-friendly if the plans included whatever
{{StreamWriter.toString}} would (which in case of {{ConsoleWriter}} would be
{{ConsoleWriter[numRows=..., truncate=...]}} which gives more context).
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