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https://issues.apache.org/jira/browse/SPARK-5738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315906#comment-14315906
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Apache Spark commented on SPARK-5738:
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User 'yanbohappy' has created a pull request for this issue:
https://github.com/apache/spark/pull/4527
> [SQL] Reuse mutable row for each record at jsonStringToRow
> ----------------------------------------------------------
>
> Key: SPARK-5738
> URL: https://issues.apache.org/jira/browse/SPARK-5738
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Yanbo Liang
>
> Other table scan like operations include ParquetTableScan, HiveTableScan use
> a reusable mutable row for seralization to decrease garbage. We also make
> JSONRelation#buildScan() with this optimization.
> When serialize json string to row, reuse a mutable row for each record
> instead of creating a new one for every record. But every nested struct type
> in each record, we still need to create a new row for them.
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