[jira] [Created] (SPARK-24215) Implement __repr__ and _repr_html_ for dataframes in PySpark

["Ryan Blue (JIRA)" <ji...@apache.org>]

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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