Add function volatility to Signature #1071
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…nature type which has volatility calssification
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| BuiltinScalarFunction::Upper => Volatility::Immutable, | ||
| BuiltinScalarFunction::RegexpMatch => Volatility::Immutable, | ||
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| //Stable builtin functions |
python/tests/test_df.py
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| @@ -81,7 +81,7 @@ def test_limit(df): | |||
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| def test_udf(df): | |||
| # is_null is a pa function over arrays | |||
| udf = f.udf(lambda x: x.is_null(), [pa.int64()], pa.bool_()) | |||
| udf = f.udf(lambda x: x.is_null(), [pa.int64()], pa.bool_(), f.Volatility.immutable()) | |||
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I believe this line is causing the python code formatter to fail
You can fix it by running a command such as the following
cd datafusion
black --line-length 79 python
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Thanks again @pjmore ! |
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Which issue does this PR close?
Closes #1069.
Rationale for this change
Make volatility a first class concept for functions.
What changes are included in this PR?
Renamed the Signature enum to TypeSignature and added Signature struct which currently has 2 fields, type_signature and volatility. I initially tried adding another field containing the volatility to the original Signature enum but this felt clunky and while it could potential allow for conditionally stable\immutable functions with the OneOf variant that seemed like a fairly niche optimization.
Are there any user-facing changes?
Yes Signature was renamed and volatility has been added. There are breaking changes to the public API from this, could someone add the
api-breaklabel? I don't have permission to add labels.