Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6959#discussion_r33419372
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java
---
@@ -48,7 +38,15 @@
* 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
--- End diff --
added
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