ARROW-11653: [Rust][DataFusion] Postgres String Functions: ascii, chr, initcap, repeat, reverse, to_hex #9625
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Thanks @seddonm1 -- I plan to review this tomorrow |
andygrove
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andygrove
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I skimmed through this and it looks good. The only nit I have is that we are often repeating this code:
args[0]
.as_any()
.downcast_ref::<GenericStringArray<T>>()
.ok_or_else(|| {
DataFusionError::Internal("could not cast string to StringArray".to_string())
})?;It might be worth considering adding a helper method or macro for this.
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@andygrove no problem. I will create a macro for that. |
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I didn't review all of the code in detail but I am approving this based on the tests (which are really cool) and the fact that this is new functionality, so we can always follow up with bug fixes if issues are found. Thanks for adding the macros - I think that makes the code much easier to review.
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Thanks @andygrove . I have a few more PRs to do to finish this first phase of work. Then I think it's time to tackle type coercion. |
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I went through this PR carefully and I like it!
I agree with @andygrove 's comments about the excellent test coverage and new code. 🏅 🏅
Thank you so much @seddonm1 . I'll plan to merge this sometime over the next day or two
| test_expression!("character_length('josé')", "4"); | ||
| test_expression!("character_length(NULL)", "NULL"); | ||
| test_expression!("chr(CAST(120 AS int))", "x"); | ||
| test_expression!("chr(CAST(128175 AS int))", "💯"); |
| test_function!( | ||
| Ascii, | ||
| &[lit(ScalarValue::Utf8(Some("💯".to_string())))], | ||
| Ok(Some(128175)), |
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It is strange to me that a function called ascii can return something larger than 127. However, it seems that quirkiness / awesomeness came from postgres :)
alamb=# select ascii('💯');
ascii
--------
128175
(1 row)
👍
| "could not cast fill to StringArray".to_string(), | ||
| ) | ||
| })?; | ||
| let string_array = downcast_string_arg!(args[0], "string", T); |
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these macros certainly make the code nicer to read. 👍
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@alamb This is the second last of the current string functions but I think there may be one after that with new code.
This implements some of the miscellaneous string functions
ascii,chr,initcap,repeat,reverse,to_hex. The next PR will have more useful functions (including regex).A little bit of tidying for consistency to the other functions was applied.
This PR is a child of #9243