viirya commented on code in PR #57105:
URL: https://github.com/apache/spark/pull/57105#discussion_r3562719812
##########
python/pyspark/sql/conversion.py:
##########
@@ -1043,9 +1046,44 @@ def _to_pylist(column: Union["pa.Array",
"pa.ChunkedArray"]) -> List[Any]:
result.extend(ArrowTableToRowsConversion._to_pylist(chunk))
return result
- if (pa.types.is_list(column.type) or
pa.types.is_large_list(column.type)) and len(
- column
- ) > 0:
+ if len(column) == 0:
+ return []
+
+ if pa.types.is_map(column.type):
+ # Maps have the same offsets layout as lists; each row becomes a
+ # list of (key, value) tuples, matching MapScalar.as_py.
+ n = len(column)
+ offsets = column.offsets.to_numpy(zero_copy_only=True).tolist()
+ start = offsets[0]
+ length = offsets[-1] - start
+ keys =
ArrowTableToRowsConversion._to_pylist(column.keys.slice(start, length))
+ items =
ArrowTableToRowsConversion._to_pylist(column.items.slice(start, length))
+ if column.null_count == 0:
+ return [
+ list(
+ zip(
+ keys[offsets[i] - start : offsets[i + 1] - start],
+ items[offsets[i] - start : offsets[i + 1] - start],
+ )
+ )
+ for i in range(n)
+ ]
+ valid = column.is_valid().to_numpy(zero_copy_only=False).tolist()
+ return [
+ (
+ list(
+ zip(
+ keys[offsets[i] - start : offsets[i + 1] - start],
+ items[offsets[i] - start : offsets[i + 1] - start],
+ )
+ )
+ if valid[i]
+ else None
+ )
+ for i in range(n)
+ ]
+
+ if pa.types.is_list(column.type) or
pa.types.is_large_list(column.type):
Review Comment:
Done in fc45dd79539 — both changed to `elif`.
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