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From "Reynold Xin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-9358) GenerateUnsafeRowJoiner
Date Sat, 01 Aug 2015 02:38:04 GMT

     [ https://issues.apache.org/jira/browse/SPARK-9358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Reynold Xin updated SPARK-9358:
-------------------------------
    Summary: GenerateUnsafeRowJoiner  (was: Create a UnsafeRowConcat class)

> GenerateUnsafeRowJoiner
> -----------------------
>
>                 Key: SPARK-9358
>                 URL: https://issues.apache.org/jira/browse/SPARK-9358
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>            Assignee: Reynold Xin
>
> 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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