Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/13680#discussion_r73627677 --- 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] --- End diff -- The previous format isn't aligned either, I think it's ok because `UnsafeArray` won't appear along, but always as a field of `UnsafeRow`. And we do align the whole content of `UnsafeArray` when write it into `UnsafeRow`
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