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https://issues.apache.org/jira/browse/SPARK-58277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-58277:
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Labels: pull-request-available (was: )
> Stream DataType.json to bound peak driver memory for large schemas
> ------------------------------------------------------------------
>
> Key: SPARK-58277
> URL: https://issues.apache.org/jira/browse/SPARK-58277
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Ben Hollis
> Priority: Minor
> Labels: pull-request-available
>
> *Problem*
> DataType.json builds the entire schema's json4s AST in memory and then
> renders it to a String. The intermediate AST is roughly an order of magnitude
> larger than the resulting JSON string, so for a very wide or deeply nested
> schema it can dominate — and in pathological cases exhaust — the driver heap,
> even though the final JSON is comparatively small.
> *Goal*
> Make DataType JSON serialization bound its peak memory to something
> proportional to the output rather than to the whole schema's AST, with
> byte-for-byte identical output and no public API or format change.
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