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https://issues.apache.org/jira/browse/SPARK-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315530#comment-14315530
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Yin Huai commented on SPARK-5443:
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Yeah, I think we can improve performance by only construct rows with needed
field. Also, we can get better improvement if we only parse needed fields.
> jsonRDD with schema should ignore sub-objects that are omitted in schema
> ------------------------------------------------------------------------
>
> Key: SPARK-5443
> URL: https://issues.apache.org/jira/browse/SPARK-5443
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 1.2.0
> Reporter: Derrick Burns
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Reading the code for jsonRDD, it appears that all fields of a JSON object are
> read into a ROW independent of the provided schema. I would expect it to be
> more efficient to only store in the ROW those fields that are explicitly
> included in the schema.
> For example, assume that I only wish to extract the "id" field of a tweet.
> If I provided a schema that simply had one field within a map named "id",
> then the row object would only store that field within a map.
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