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[SPARK-53563][PS] Optimize: sql_processor by avoiding inefficient string concatenation #52322

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[SPARK-53563][PS] Optimize: sql_processor by avoiding inefficient string concatenation #52322

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7 changes: 3 additions & 4 deletions python/pyspark/pandas/sql_processor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -293,13 +293,12 @@ def execute(self, index_col: Optional[Union[str, List[str]]]) -> DataFrame:
0 True False
"""
blocks = _string.formatter_parser(self._statement)
# TODO: use a string builder
res = ""
res = []
try:
for pre, inner, _, _ in blocks:
var_next = "" if inner is None else self._convert(inner)
res = res + pre + var_next
self._normalized_statement = res
res.append(pre + var_next)
self._normalized_statement = "".join(res)

sdf = self._session.sql(self._normalized_statement)
finally:
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