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⚡ Bolt: [performance improvement] optimize dbf string decoding #2

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⚡ Bolt: [performance improvement] optimize dbf string decoding #2

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28 changes: 16 additions & 12 deletions pysus/data/dbf_reader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -158,12 +158,14 @@ def read_dbf_fast(
data = {}
for fld in target:
col: np.ndarray = records[fld.name]
decoded = np.empty(n, dtype=object)
for i in range(n):
val = col[i]
b = val if isinstance(val, bytes) else val.tobytes()
decoded[i] = _decode(b)
data[fld.name] = decoded
# Optimize decoding loop with list comprehension
data[fld.name] = [
(b if isinstance(b, bytes) else b.tobytes())
.decode(_ENCODING, errors="replace")
.replace("\x00", "")
.strip()
for b in col
]

return pd.DataFrame(data)

Expand Down Expand Up @@ -273,12 +275,14 @@ def stream_dbf_fast(
data = {}
for fld in schema.fields:
col: np.ndarray = records[fld.name]
decoded = np.empty(chunk_n, dtype=object)
for i in range(chunk_n):
val = col[i]
b = val if isinstance(val, bytes) else val.tobytes()
decoded[i] = _decode(b)
data[fld.name] = decoded
# Optimize decoding loop with list comprehension
data[fld.name] = [
(b if isinstance(b, bytes) else b.tobytes())
.decode(_ENCODING, errors="replace")
.replace("\x00", "")
.strip()
for b in col
]

yield pd.DataFrame(data)

Expand Down