[jira] [Created] (SPARK-27977) MicroBatchWriter should use StreamWriter for human-friendly textual representation (toString)

["Jacek Laskowski (JIRA)" <ji...@apache.org>]

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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