Yikf commented on code in PR #41065:
URL: https://github.com/apache/spark/pull/41065#discussion_r1213851366
##########
python/pyspark/ml/feature.py:
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@@ -5313,7 +5313,7 @@ class VectorAssembler(
+---+---+----+-------------+
| a| b| c| features|
+---+---+----+-------------+
- |1.0|2.0|NULL|[1.0,2.0,NaN]|
+ |1.0|2.0|null|[1.0,2.0,NaN]|
Review Comment:
Existing behavior should be `null`, `NULL` is changed in
https://github.com/apache/spark/pull/40699, I think we should do the same with
map type, default to `null` instead of `NULL`
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