[jira] [Created] (SPARK-17517) Improve generated Code for BroadcastHashJoinExec

["Kent Yao (JIRA)" <ji...@apache.org>]

Kent Yao created SPARK-17517:
--------------------------------

             Summary: Improve generated Code for BroadcastHashJoinExec
                 Key: SPARK-17517
                 URL: https://issues.apache.org/jira/browse/SPARK-17517
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Kent Yao
             Fix For: 2.1.0


For current `BroadcastHashJoinExec`, we generate join code for key is not unique like this: 

```java
while (matches.hasnext)
    matched = matches.next
    check and read stream side row fields
    check and read build side row fieldes
    reset result row
    write stream side row fields to result row
    write stream side row fields to result row
```

For some cases, we don't need to check/read/write the steam side repeatedly in such while circle, e.g. `Inner Join with BuildRight`, or `BuildLeft &&  all left side fields are fixed length` and so on. we may generate the code as below:

```java
check and read stream side row fields
reset result row
write stream side row fields to result row
while (matches.hasnext)
    matched = matches.next
    check and read build side row fieldes
    write stream side row fields to result row
```





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