Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6959#discussion_r33517056
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java
---
@@ -44,7 +36,20 @@
* primitive types, such as long, double, or int, we store the value
directly in the word. For
* fields with non-primitive or variable-length values, we store a
relative offset (w.r.t. the
* base address of the row) that points to the beginning of the
variable-length field, and length
- * (they are combined into a long).
+ * (they are combined into a long). For other objects, they are stored in
a pool, the indexes of
+ * them are hold in the the word.
+ *
+ * In order to support fast hashing and equality checks for UnsafeRows
that contain objects
+ * when used as grouping key in BytesToBytesMap, we put the objects in an
UniqueObjectPool to make
+ * sure all the keyhave the same index for same object, then we can
hash/compare the objects by
--- End diff --
Typo: `keyhave`
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