Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7682#discussion_r35616321
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java
---
@@ -236,6 +236,41 @@ public Object get(int ordinal) {
}
@Override
+ public Object get(int ordinal, DataType dataType) {
+ if (dataType instanceof NullType) {
--- End diff --
Actually, it looks like our existing row behavior is to just return the
zero-value of the given type for null inputs (e.g. getFloat on a null column
returns 0.0f whereas the generic getter returns null). For some reason, it
looks like UnsafeRow was returning NaN instead of 0 in those cases, leading to
a confusing bug. I'm going to fix this inconsistency in a separate patch.
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