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https://issues.apache.org/jira/browse/SPARK-9358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-9358:
-----------------------------------
Assignee: Apache Spark (was: Yijie Shen)
> 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: Apache Spark
>
> 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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