lavanv11 opened a new pull request, #55867:
URL: https://github.com/apache/spark/pull/55867
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### What changes were proposed in this pull request?
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Filter None values in Classic PySpark's DataFrameReader, DataFrameWriter,
DataFrameWriterV2, DataStreamReader, and DataStreamWriter `.option(key, value)`
and `.options(**kwargs)` methods. After this change, `option(key, None)` is a
no-op and `options(**{key: None, ...})` drops the None entries before
forwarding to the JVM. The loop-style methods mirror the shape of
`OptionUtils._set_opts` at `python/pyspark/sql/readwriter.py:41-53`: `for k, v
in options.items(): if v is not None: ...`.
### Why are the changes needed?
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Classic and Spark Connect Python currently disagree on what `option(key,
None)` means. Classic forwards Python None to the JVM as Java null, which
several data sources interpret differently from "unset". For example, with
`spark.read.options(nullValue=None).schema("a STRING, b STRING").csv(path)` and
a row `"",val`, Classic produces `[Row(a='', b='val')]` while Connect produces
`[Row(a=None, b='val')]` because Connect drops the None, the default
`nullValue` of `""` stays in effect, and the quoted empty cell matches it. This
PR aligns Classic with Connect (which has filtered None since SPARK-49263) and
with the long-standing `OptionUtils._set_opts` convention.
### Does this PR introduce _any_ user-facing change?
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Yes. `option(k, None)` and `options(**{k: None})` were previously forwarded
to the JVM as null; they are now no-ops. A migration-guide entry under
"Upgrading from PySpark 4.1 to 4.2" documents the change. To set an option to
its default, omit it or pass None; to set it to an empty string, pass `""`
explicitly.
### How was this patch tested?
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New parity test `test_option_none_is_filtered` in `ReadwriterTestsMixin`
pins the CSV `nullValue=None` case to `[Row(a=None, b="val")]` for both
`.option` and `.options`. Because `ReadwriterParityTests` inherits the mixin,
the regression test runs on Classic and on Spark Connect, giving cross-backend
coverage automatically.
Additional defensive smoke tests guard the writer / V2 writer / streaming
reader / streaming writer API contracts:
- `test_writer_option_none_chains_safely`
- `test_v2_writer_option_none_chains_safely`
- `test_stream_reader_option_none_chains_safely`
- `test_stream_writer_option_none_chains_safely`
### Was this patch authored or co-authored using generative AI tooling?
Partially Generated-by: Claude Opus 4.7
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