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⚡ Bolt: [performance improvement] Optimize PyArrow column serialization #2581

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⚡ Bolt: [performance improvement] Optimize PyArrow column serialization #2581

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a9f31df
⚡ Bolt: [performance improvement] Optimize PyArrow column serialization
google-labs-jules[bot] Mar 27, 2026
e1b3f8e
⚡ Bolt: [performance improvement] Optimize PyArrow column serialization
google-labs-jules[bot] Mar 27, 2026
f1298d7
⚡ Bolt: [performance improvement] Optimize PyArrow column serialization
google-labs-jules[bot] Mar 27, 2026
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5 changes: 4 additions & 1 deletion src/bioetl/domain/serialization.py
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Original file line number Diff line number Diff line change
Expand Up @@ -265,8 +265,11 @@ def is_complex_type(field_type: pa.DataType) -> bool:

def serialize_column_to_json(col: pa.ChunkedArray) -> pa.Array:
"""Serialize a complex Arrow column into stringified JSON values."""
# Performance optimization: .as_py() is expensive for PyArrow scalars.
# Use the walrus operator to evaluate it once per element instead of twice.
vals = [
serialize_to_json(v.as_py()) if v.as_py() is not None else None for v in col
serialize_to_json(val) if (val := v.as_py()) is not None else None
for v in col
]
return pa.array(vals, type=pa.string())

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