alamb commented on code in PR #9841: URL: https://github.com/apache/arrow-datafusion/pull/9841#discussion_r1543802687
########## datafusion/functions/src/unicode/left.rs: ########## @@ -0,0 +1,245 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::any::Any; +use std::cmp::Ordering; +use std::sync::Arc; + +use arrow::array::{ArrayRef, GenericStringArray, OffsetSizeTrait}; +use arrow::datatypes::DataType; + +use datafusion_common::cast::{as_generic_string_array, as_int64_array}; +use datafusion_common::exec_err; +use datafusion_common::Result; +use datafusion_expr::TypeSignature::Exact; +use datafusion_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility}; + +use crate::utils::{make_scalar_function, utf8_to_str_type}; + +#[derive(Debug)] +pub(super) struct LeftFunc { + signature: Signature, +} + +impl LeftFunc { + pub fn new() -> Self { + use DataType::*; + Self { + signature: Signature::one_of( + vec![Exact(vec![Utf8, Int64]), Exact(vec![LargeUtf8, Int64])], + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for LeftFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "left" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> { + utf8_to_str_type(&arg_types[0], "left") + } + + fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { + match args[0].data_type() { + DataType::Utf8 => make_scalar_function(left::<i32>, vec![])(args), + DataType::LargeUtf8 => make_scalar_function(left::<i64>, vec![])(args), + other => exec_err!("Unsupported data type {other:?} for function left"), + } + } +} + +/// Returns first n characters in the string, or when n is negative, returns all but last |n| characters. +/// left('abcde', 2) = 'ab' +/// The implementation uses UTF-8 code points as characters +pub fn left<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> { + let string_array = as_generic_string_array::<T>(&args[0])?; + let n_array = as_int64_array(&args[1])?; + let result = string_array + .iter() + .zip(n_array.iter()) + .map(|(string, n)| match (string, n) { + (Some(string), Some(n)) => match n.cmp(&0) { + Ordering::Less => { + let len = string.chars().count() as i64; + Some(if n.abs() < len { + string.chars().take((len + n) as usize).collect::<String>() + } else { + "".to_string() + }) + } + Ordering::Equal => Some("".to_string()), + Ordering::Greater => { + Some(string.chars().take(n as usize).collect::<String>()) + } + }, + _ => None, + }) + .collect::<GenericStringArray<T>>(); + + Ok(Arc::new(result) as ArrayRef) +} + +#[cfg(test)] +mod tests { + use arrow::array::{Array, StringArray}; + use arrow::datatypes::DataType::Utf8; + + use datafusion_common::{Result, ScalarValue}; + use datafusion_expr::{ColumnarValue, ScalarUDFImpl}; + + use crate::unicode::left::LeftFunc; + use crate::utils::test::test_function; + + #[test] + fn test_functions() -> Result<()> { + #[cfg(feature = "unicode_expressions")] Review Comment: Since the whole module is cfg'd we can probably remove these guards on individual tests ########## datafusion/functions/src/unicode/left.rs: ########## @@ -0,0 +1,245 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::any::Any; +use std::cmp::Ordering; +use std::sync::Arc; + +use arrow::array::{ArrayRef, GenericStringArray, OffsetSizeTrait}; +use arrow::datatypes::DataType; + +use datafusion_common::cast::{as_generic_string_array, as_int64_array}; +use datafusion_common::exec_err; +use datafusion_common::Result; +use datafusion_expr::TypeSignature::Exact; +use datafusion_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility}; + +use crate::utils::{make_scalar_function, utf8_to_str_type}; + +#[derive(Debug)] +pub(super) struct LeftFunc { + signature: Signature, +} + +impl LeftFunc { + pub fn new() -> Self { + use DataType::*; + Self { + signature: Signature::one_of( + vec![Exact(vec![Utf8, Int64]), Exact(vec![LargeUtf8, Int64])], + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for LeftFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "left" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> { + utf8_to_str_type(&arg_types[0], "left") + } + + fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { + match args[0].data_type() { + DataType::Utf8 => make_scalar_function(left::<i32>, vec![])(args), + DataType::LargeUtf8 => make_scalar_function(left::<i64>, vec![])(args), + other => exec_err!("Unsupported data type {other:?} for function left"), + } + } +} + +/// Returns first n characters in the string, or when n is negative, returns all but last |n| characters. +/// left('abcde', 2) = 'ab' +/// The implementation uses UTF-8 code points as characters +pub fn left<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> { + let string_array = as_generic_string_array::<T>(&args[0])?; + let n_array = as_int64_array(&args[1])?; + let result = string_array + .iter() + .zip(n_array.iter()) + .map(|(string, n)| match (string, n) { + (Some(string), Some(n)) => match n.cmp(&0) { + Ordering::Less => { + let len = string.chars().count() as i64; + Some(if n.abs() < len { + string.chars().take((len + n) as usize).collect::<String>() + } else { + "".to_string() + }) + } + Ordering::Equal => Some("".to_string()), + Ordering::Greater => { + Some(string.chars().take(n as usize).collect::<String>()) + } + }, + _ => None, + }) + .collect::<GenericStringArray<T>>(); + + Ok(Arc::new(result) as ArrayRef) +} + +#[cfg(test)] +mod tests { + use arrow::array::{Array, StringArray}; + use arrow::datatypes::DataType::Utf8; + + use datafusion_common::{Result, ScalarValue}; + use datafusion_expr::{ColumnarValue, ScalarUDFImpl}; + + use crate::unicode::left::LeftFunc; + use crate::utils::test::test_function; + + #[test] + fn test_functions() -> Result<()> { + #[cfg(feature = "unicode_expressions")] + test_function!( + LeftFunc::new(), + &[ + ColumnarValue::Scalar(ScalarValue::Utf8(Some(String::from("abcde")))), + ColumnarValue::Scalar(ScalarValue::Int64(Some(2))), Review Comment: (same thing applies to the rest of the tests in this file and and the others) ########## datafusion/functions/src/unicode/left.rs: ########## @@ -0,0 +1,245 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::any::Any; +use std::cmp::Ordering; +use std::sync::Arc; + +use arrow::array::{ArrayRef, GenericStringArray, OffsetSizeTrait}; +use arrow::datatypes::DataType; + +use datafusion_common::cast::{as_generic_string_array, as_int64_array}; +use datafusion_common::exec_err; +use datafusion_common::Result; +use datafusion_expr::TypeSignature::Exact; +use datafusion_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility}; + +use crate::utils::{make_scalar_function, utf8_to_str_type}; + +#[derive(Debug)] +pub(super) struct LeftFunc { + signature: Signature, +} + +impl LeftFunc { + pub fn new() -> Self { + use DataType::*; + Self { + signature: Signature::one_of( + vec![Exact(vec![Utf8, Int64]), Exact(vec![LargeUtf8, Int64])], + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for LeftFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "left" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> { + utf8_to_str_type(&arg_types[0], "left") + } + + fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { + match args[0].data_type() { + DataType::Utf8 => make_scalar_function(left::<i32>, vec![])(args), + DataType::LargeUtf8 => make_scalar_function(left::<i64>, vec![])(args), + other => exec_err!("Unsupported data type {other:?} for function left"), + } + } +} + +/// Returns first n characters in the string, or when n is negative, returns all but last |n| characters. +/// left('abcde', 2) = 'ab' +/// The implementation uses UTF-8 code points as characters +pub fn left<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> { + let string_array = as_generic_string_array::<T>(&args[0])?; + let n_array = as_int64_array(&args[1])?; + let result = string_array + .iter() + .zip(n_array.iter()) + .map(|(string, n)| match (string, n) { + (Some(string), Some(n)) => match n.cmp(&0) { + Ordering::Less => { + let len = string.chars().count() as i64; + Some(if n.abs() < len { + string.chars().take((len + n) as usize).collect::<String>() + } else { + "".to_string() + }) + } + Ordering::Equal => Some("".to_string()), + Ordering::Greater => { + Some(string.chars().take(n as usize).collect::<String>()) + } + }, + _ => None, + }) + .collect::<GenericStringArray<T>>(); + + Ok(Arc::new(result) as ArrayRef) +} + +#[cfg(test)] +mod tests { + use arrow::array::{Array, StringArray}; + use arrow::datatypes::DataType::Utf8; + + use datafusion_common::{Result, ScalarValue}; + use datafusion_expr::{ColumnarValue, ScalarUDFImpl}; + + use crate::unicode::left::LeftFunc; + use crate::utils::test::test_function; + + #[test] + fn test_functions() -> Result<()> { + #[cfg(feature = "unicode_expressions")] + test_function!( + LeftFunc::new(), + &[ + ColumnarValue::Scalar(ScalarValue::Utf8(Some(String::from("abcde")))), + ColumnarValue::Scalar(ScalarValue::Int64(Some(2))), Review Comment: Totally not needed as this code is just moved, but I think you can write this more concisely with `from` if you wnat: ```suggestion ColumnarValue::Scalar(ScalarValue::from("abcde")), ColumnarValue::Scalar(ScalarValue::from(2u64)), ``` ########## datafusion/functions/src/unicode/lpad.rs: ########## @@ -0,0 +1,383 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use std::any::Any; +use std::sync::Arc; + +use arrow::array::{ArrayRef, GenericStringArray, OffsetSizeTrait}; +use arrow::datatypes::DataType; +use datafusion_common::cast::{as_generic_string_array, as_int64_array}; +use unicode_segmentation::UnicodeSegmentation; + +use crate::utils::{make_scalar_function, utf8_to_str_type}; +use datafusion_common::{exec_err, Result}; +use datafusion_expr::TypeSignature::Exact; +use datafusion_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility}; + +#[derive(Debug)] +pub(super) struct LPadFunc { + signature: Signature, +} + +impl LPadFunc { + pub fn new() -> Self { + use DataType::*; + Self { + signature: Signature::one_of( + vec![ + Exact(vec![Utf8, Int64]), + Exact(vec![LargeUtf8, Int64]), + Exact(vec![Utf8, Int64, Utf8]), + Exact(vec![LargeUtf8, Int64, Utf8]), + Exact(vec![Utf8, Int64, LargeUtf8]), + Exact(vec![LargeUtf8, Int64, LargeUtf8]), + ], + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for LPadFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "lpad" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> Result<DataType> { + utf8_to_str_type(&arg_types[0], "lpad") + } + + fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { + match args[0].data_type() { + DataType::Utf8 => make_scalar_function(lpad::<i32>, vec![])(args), + DataType::LargeUtf8 => make_scalar_function(lpad::<i64>, vec![])(args), + other => exec_err!("Unsupported data type {other:?} for function lpad"), + } + } +} + +/// Extends the string to length 'length' by prepending the characters fill (a space by default). If the string is already longer than length then it is truncated (on the right). +/// lpad('hi', 5, 'xy') = 'xyxhi' +pub fn lpad<T: OffsetSizeTrait>(args: &[ArrayRef]) -> Result<ArrayRef> { + match args.len() { + 2 => { + let string_array = as_generic_string_array::<T>(&args[0])?; + let length_array = as_int64_array(&args[1])?; + + let result = string_array + .iter() + .zip(length_array.iter()) + .map(|(string, length)| match (string, length) { + (Some(string), Some(length)) => { + if length > i32::MAX as i64 { + return exec_err!( + "lpad requested length {length} too large" + ); + } + + let length = if length < 0 { 0 } else { length as usize }; + if length == 0 { + Ok(Some("".to_string())) + } else { + let graphemes = string.graphemes(true).collect::<Vec<&str>>(); + if length < graphemes.len() { + Ok(Some(graphemes[..length].concat())) + } else { + let mut s: String = " ".repeat(length - graphemes.len()); + s.push_str(string); + Ok(Some(s)) + } + } + } + _ => Ok(None), + }) + .collect::<Result<GenericStringArray<T>>>()?; + + Ok(Arc::new(result) as ArrayRef) + } + 3 => { + let string_array = as_generic_string_array::<T>(&args[0])?; + let length_array = as_int64_array(&args[1])?; + let fill_array = as_generic_string_array::<T>(&args[2])?; + + let result = string_array + .iter() + .zip(length_array.iter()) + .zip(fill_array.iter()) + .map(|((string, length), fill)| match (string, length, fill) { + (Some(string), Some(length), Some(fill)) => { + if length > i32::MAX as i64 { + return exec_err!( + "lpad requested length {length} too large" + ); + } + + let length = if length < 0 { 0 } else { length as usize }; + if length == 0 { + Ok(Some("".to_string())) + } else { + let graphemes = string.graphemes(true).collect::<Vec<&str>>(); + let fill_chars = fill.chars().collect::<Vec<char>>(); + + if length < graphemes.len() { + Ok(Some(graphemes[..length].concat())) + } else if fill_chars.is_empty() { + Ok(Some(string.to_string())) + } else { + let mut s = string.to_string(); + let mut char_vector = + Vec::<char>::with_capacity(length - graphemes.len()); + for l in 0..length - graphemes.len() { + char_vector.push( + *fill_chars.get(l % fill_chars.len()).unwrap(), + ); + } + s.insert_str( + 0, + char_vector.iter().collect::<String>().as_str(), + ); + Ok(Some(s)) + } + } + } + _ => Ok(None), + }) + .collect::<Result<GenericStringArray<T>>>()?; + + Ok(Arc::new(result) as ArrayRef) + } + other => exec_err!( + "lpad was called with {other} arguments. It requires at least 2 and at most 3." + ), + } +} + +#[cfg(test)] +mod tests { + use arrow::array::{Array, StringArray}; + use arrow::datatypes::DataType::Utf8; + + use datafusion_common::{Result, ScalarValue}; + use datafusion_expr::{ColumnarValue, ScalarUDFImpl}; + + use crate::unicode::lpad::LPadFunc; + use crate::utils::test::test_function; + + #[test] + fn test_functions() -> Result<()> { Review Comment: (same comments as above about `cfg` and `ScalarValue::from` apply here too) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
