Yicong-Huang commented on code in PR #57911:
URL: https://github.com/apache/spark/pull/57911#discussion_r3781242551
##########
python/pyspark/sql/conversion.py:
##########
@@ -804,13 +830,16 @@ def convert_string(value: Any) -> Any:
if not nullable:
raise PySparkValueError(f"input for {dataType} must
not be None")
return None
- else:
- if isinstance(value, bool):
- # To match the PySpark Classic which convert bool to
string in
- # the JVM side (python.EvaluatePython.makeFromJava)
- return str(value).lower()
- else:
- return str(value)
+ if type(value) is str:
+ # Fast path: `str(value)` returns `value` itself for a
`str`
+ # input (no copy), but still pays the constructor dispatch
per
+ # element. Returning it directly skips that and the bool
check.
+ return value
+ if isinstance(value, bool):
Review Comment:
This indeed helped a bit, changed as suggested
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