Minor: remove potential string copy from Column::from_qualified_name #10947
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alamb
commented
Jun 17, 2024
| @@ -109,21 +109,21 @@ impl Column { | |||
| /// `foo.BAR` would be parsed to a reference to relation `foo`, column name `bar` (lower case) | |||
| /// where `"foo.BAR"` would be parsed to a reference to column named `foo.BAR` | |||
| pub fn from_qualified_name(flat_name: impl Into<String>) -> Self { | |||
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I think we could make this significantly better for the common case (non error) by changing the signature to take &str but that would be a breaking change, and I think we should only do it if benchmarking shows it helps.
Most of the time is actually taken parsing the identifier
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Which issue does this PR close?
Closes #.
Rationale for this change
While profiling code for for CSE copy removal (#10835) and noticed that 5% of the time was spent in
Column::from_qualified_name(see screen shot)When I looked into this a bit more, it seems to be copying the string twice on the error path which can be avoided.
I doubt this will matter much in practice but I also think the code is cleaner this way.
What changes are included in this PR?
Only make a string when needed
Are these changes tested?
Are there any user-facing changes?