Ryan Blue created SPARK-24215:
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Summary: Implement __repr__ and _repr_html_ for dataframes in
PySpark
Key: SPARK-24215
URL: https://issues.apache.org/jira/browse/SPARK-24215
Project: Spark
Issue Type: Improvement
Components: PySpark, SQL
Affects Versions: 2.3.0
Reporter: Ryan Blue
Fix For: 2.4.0
To help people that are new to Spark get feedback more easily, we should
implement the repr methods for Jupyter python kernels. That way, when users run
pyspark in jupyter console or notebooks, they get good feedback.
That output should include an option for eager evaluation, like
spark.jupyter.eager-eval. When set, the formatting methods would run dataframes
and produce output like {{show}}. This is a good balance between not hiding
Spark's action behavior and getting feedback to users that don't know to call
actions.
Here's the dev list thread for context:
http://apache-spark-developers-list.1001551.n3.nabble.com/eager-execution-and-debuggability-td23928.html
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