Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21654#discussion_r216554397
--- Diff: python/pyspark/sql/dataframe.py ---
@@ -375,6 +375,9 @@ def _truncate(self):
return int(self.sql_ctx.getConf(
"spark.sql.repl.eagerEval.truncate", "20"))
+ def __len__(self):
--- End diff --
I would say `_repr_*_` was added because I saw a strong need and usecase
for it. I am worried about `len(..)` we are trying to add here. For instance,
what would you expect from `list(df)` and `len(df)` ..
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