Fokko opened a new pull request #28554:
URL: https://github.com/apache/spark/pull/28554
For example, dates are missing from the export:
```
from datetime import datetime, timedelta, timezone
from pyspark.sql import types as T
from pyspark.sql import Row
from pyspark.sql import functions as F
START = datetime(2014, 1, 1, tzinfo=timezone.utc)
n_days = 22
date_range = [Row(date=(START + timedelta(days=n))) for n in range(0,
n_days)]
schema = T.StructType([T.StructField(name="date", dataType=T.DateType(),
nullable=False)])
rdd = spark.sparkContext.parallelize(date_range)
df = spark.createDataFrame(data=rdd, schema=schema)
df.agg(F.max("date")).show()
df.summary().show()
+-------+
|summary|
+-------+
| count|
| mean|
| stddev|
| min|
| 25%|
| 50%|
| 75%|
| max|
+-------+
```
Even something less common such as arrays are sortable:
```
elcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 2.4.5
/_/
Using Scala version 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java
1.8.0_172)
Type in expressions to have them evaluated.
Type :help for more information.
scala>
scala> val singersDF = Seq(
| ("beatles", "help|hey jude"),
| ("romeo", "eres mia")
| ).toDF("name", "hit_songs")
singersDF: org.apache.spark.sql.DataFrame = [name: string, hit_songs: string]
scala>
scala> val actualDF = singersDF.withColumn(
| "hit_songs",
| split(col("hit_songs"), "\\|")
| )
actualDF: org.apache.spark.sql.DataFrame = [name: string, hit_songs:
array<string>]
scala> actualDF.show()
+-------+----------------+
| name| hit_songs|
+-------+----------------+
|beatles|[help, hey jude]|
| romeo| [eres mia]|
+-------+----------------+
scala> df.max("hit_songs")
<console>:24: error: not found: value df
df.max("hit_songs")
^
scala> actualDF.max("hit_songs")
<console>:26: error: value max is not a member of
org.apache.spark.sql.DataFrame
actualDF.max("hit_songs")
^
scala> actualDF.agg(min("hit_songs"), max("hit_songs"))
res3: org.apache.spark.sql.DataFrame = [min(hit_songs): array<string>,
max(hit_songs): array<string>]
scala> actualDF.agg(min("hit_songs"), max("hit_songs")).show()
+--------------+----------------+
|min(hit_songs)| max(hit_songs)|
+--------------+----------------+
| [eres mia]|[help, hey jude]|
+--------------+----------------+
```
Signed-off-by: Fokko Driesprong <[email protected]>
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### What changes were proposed in this pull request?
Not filtering the columns to compute statistics on.
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### Why are the changes needed?
Something as simple as DateTypes are not showing up in the output.
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### Does this PR introduce _any_ user-facing change?
Might be, as their output will change of the summary if they have columns
that aren't part of the summary right now.
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### How was this patch tested?
Existing tests.
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