panbingkun commented on code in PR #44665:
URL: https://github.com/apache/spark/pull/44665#discussion_r1520791983
##########
python/pyspark/sql/functions/builtin.py:
##########
@@ -15534,19 +15532,7 @@ def to_csv(col: "ColumnOrName", options:
Optional[Dict[str, str]] = None) -> Col
| 2,Alice|
+-------------+
- Example 2: Converting a complex StructType to a CSV string
-
- >>> from pyspark.sql import Row, functions as sf
- >>> data = [(1, Row(age=2, name='Alice', scores=[100, 200, 300]))]
- >>> df = spark.createDataFrame(data, ("key", "value"))
- >>> df.select(sf.to_csv(df.value)).show(truncate=False) # doctest: +SKIP
- +-----------------------+
- |to_csv(value) |
- +-----------------------+
- |2,Alice,"[100,200,300]"|
Review Comment:
In `this case` of Python, it is because the data type is ArrayData
(specifically implemented as `GenericArrayData`),
This case just goes into the following logic:
https://github.com/apache/spark/blob/09bdf2a9334f210ece4c23d0f3324f81113330d0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/UnivocityGenerator.scala#L91-L93
https://github.com/apache/spark/blob/09bdf2a9334f210ece4c23d0f3324f81113330d0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/GenericArrayData.scala#L85
And it just so happens that `GenericArrayData` overrides the `toString`
method, so it appears to display the result `correctly`, perhaps it's just a
`coincidence`?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
