GitHub user zsxwing opened a pull request:
https://github.com/apache/spark/pull/13815
[SPARK-15443][SQL]Fix 'explain' for streaming Dataset
## What changes were proposed in this pull request?
- Fix the `explain` command for streaming Dataset/DataFrame. E.g.,
```
== Parsed Logical Plan ==
'SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- 'MapElements <function1>, obj#6: java.lang.String
+- 'DeserializeToObject
unresolveddeserializer(createexternalrow(getcolumnbyordinal(0,
StringType).toString, StructField(value,StringType,true))), obj#5:
org.apache.spark.sql.Row
+- Filter <function1>.apply
+- StreamingRelation FileSource[/Users/zsx/stream], [value#0]
== Analyzed Logical Plan ==
value: string
SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- MapElements <function1>, obj#6: java.lang.String
+- DeserializeToObject createexternalrow(value#0.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- Filter <function1>.apply
+- StreamingRelation FileSource[/Users/zsx/stream], [value#0]
== Optimized Logical Plan ==
SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- MapElements <function1>, obj#6: java.lang.String
+- DeserializeToObject createexternalrow(value#0.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- Filter <function1>.apply
+- StreamingRelation FileSource[/Users/zsx/stream], [value#0]
== Physical Plan ==
*SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- *MapElements <function1>, obj#6: java.lang.String
+- *DeserializeToObject createexternalrow(value#0.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- *Filter <function1>.apply
+- StreamingRelation FileSource[/Users/zsx/stream], [value#0]
```
- Add `StreamingQuery.explain` to display the last execution plan. E.g.,
```
== Parsed Logical Plan ==
SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- MapElements <function1>, obj#6: java.lang.String
+- DeserializeToObject createexternalrow(value#12.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- Filter <function1>.apply
+- Relation[value#12] text
== Analyzed Logical Plan ==
value: string
SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- MapElements <function1>, obj#6: java.lang.String
+- DeserializeToObject createexternalrow(value#12.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- Filter <function1>.apply
+- Relation[value#12] text
== Optimized Logical Plan ==
SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- MapElements <function1>, obj#6: java.lang.String
+- DeserializeToObject createexternalrow(value#12.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- Filter <function1>.apply
+- Relation[value#12] text
== Physical Plan ==
*SerializeFromObject [staticinvoke(class
org.apache.spark.unsafe.types.UTF8String, StringType, fromString, input[0,
java.lang.String, true], true) AS value#7]
+- *MapElements <function1>, obj#6: java.lang.String
+- *DeserializeToObject createexternalrow(value#12.toString,
StructField(value,StringType,true)), obj#5: org.apache.spark.sql.Row
+- *Filter <function1>.apply
+- *Scan text [value#12] Format:
org.apache.spark.sql.execution.datasources.text.TextFileFormat@1836ab91,
InputPaths: file:/Users/zsx/stream/a.txt, file:/Users/zsx/stream/b.txt,
file:/Users/zsx/stream/c.txt, PushedFilters: [], ReadSchema:
struct<value:string>
```
## How was this patch tested?
The added unit tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zsxwing/spark sdf-explain
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13815.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13815
----
commit 404113fbba68280ab532b4c246a16ce948da33fb
Author: Shixiong Zhu <[email protected]>
Date: 2016-06-21T20:14:20Z
Fix 'explain' for streaming Dataset
----
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