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https://issues.apache.org/jira/browse/SPARK-58024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-58024:
-----------------------------------
Assignee: L. C. Hsieh
> Convert Arrow struct and map columns to Python rows in bulk
> -----------------------------------------------------------
>
> Key: SPARK-58024
> URL: https://issues.apache.org/jira/browse/SPARK-58024
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 5.0.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: pull-request-available
>
> Follow-up of SPARK-58019. Extend {{ArrowTableToRowsConversion._to_pylist}}
> with bulk paths for struct and map columns:
> * Struct: convert each child field in bulk (recursively reusing the list/leaf
> fast paths), zip field values into one dict per row, masked by the validity
> bitmap. Duplicate field names fall back to {{to_pylist}} so they raise the
> same {{ValueError}} as {{StructScalar.as_py}}.
> * Map: same offsets layout as lists; flattened keys/items children are
> converted in bulk and each row becomes a list of (key, value) tuples,
> matching {{MapScalar.as_py}} exactly.
> ASV microbenchmark (1M rows, 10% nulls): {{struct<int64,string>}} 914ms ->
> 175ms (5.2x); {{map<string,int64>}} 2.07s -> 303ms (6.8x).
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