Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21654#discussion_r217874544
--- 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 --
Adding some more reasonable helpers can actually confuse. It might be
better nothing as well. I agree with adding those at the end but I think we
better have the explicit plan before adding those bit by bit.
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