Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21654#discussion_r216385714
--- 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 --
Yea eventually we could allow. My question was if we should make an
explicit plan for built-in function support before we go bit by bit
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