[jira] [Created] (SPARK-9358) Create a UnsafeRowConcat class

["Reynold Xin (JIRA)" <ji...@apache.org>]

Reynold Xin created SPARK-9358:
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             Summary: Create a UnsafeRowConcat class
                 Key: SPARK-9358
                 URL: https://issues.apache.org/jira/browse/SPARK-9358
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
            Reporter: Reynold Xin
            Assignee: Yijie Shen


A class that can be used to concatenate UnsafeRows together.

{code}
class UnsafeRowConcat(leftSchema: StructType, rightSchema: StructType) {
  def concat(left: UnsafeRow, right: UnsafeRow): UnsafeRow = {
    // ...
  }
}
{code}

concat should reuse the same buffer space, to avoid constant allocation.

UnsafeRow has 3 parts: bitset, fixed-length portion, and variable length portion.

We need to concat the bitsets, the fixed-length portions, append the variable length portions,
and then update the fields with variable length portion to change the new offsets.





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