Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/13680#discussion_r73585439
--- Diff:
sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeArrayData.java
---
@@ -25,30 +25,36 @@
import org.apache.spark.sql.types.*;
import org.apache.spark.unsafe.Platform;
import org.apache.spark.unsafe.array.ByteArrayMethods;
+import org.apache.spark.unsafe.bitset.BitSetMethods;
import org.apache.spark.unsafe.hash.Murmur3_x86_32;
import org.apache.spark.unsafe.types.CalendarInterval;
import org.apache.spark.unsafe.types.UTF8String;
/**
* An Unsafe implementation of Array which is backed by raw memory instead
of Java objects.
*
- * Each tuple has three parts: [numElements] [offsets] [values]
+ * Each tuple has four parts: [numElements][null bits][values or
offset][variable length portion]
*
* The `numElements` is 4 bytes storing the number of elements of this
array.
--- End diff --
I like this. Do we declare `numElements` as `long`? Or, should we use only
4 bytes in 8 bytes?
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