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121
core/src/execution/datafusion/expressions/scalar_funcs/chr.rs
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,121 @@ | ||
| // 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. | ||
|
|
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| use std::{any::Any, sync::Arc}; | ||
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|
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| use arrow::{ | ||
| array::{ArrayRef, StringArray}, | ||
| datatypes::{ | ||
| DataType, | ||
| DataType::{Int64, Utf8}, | ||
| }, | ||
| }; | ||
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|
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| use datafusion::logical_expr::{ColumnarValue, ScalarUDFImpl, Signature, Volatility}; | ||
| use datafusion_common::{cast::as_int64_array, exec_err, DataFusionError, Result, ScalarValue}; | ||
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| /// Returns the ASCII character having the binary equivalent to the input expression. | ||
| /// E.g., chr(65) = 'A'. | ||
| /// Compatible with Apache Spark's Chr function | ||
| pub fn spark_chr(args: &[ColumnarValue]) -> Result<ColumnarValue, DataFusionError> { | ||
| let chr_func = ChrFunc::default(); | ||
| chr_func.invoke(args) | ||
| } | ||
|
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| pub fn chr(args: &[ArrayRef]) -> Result<ArrayRef> { | ||
| let integer_array = as_int64_array(&args[0])?; | ||
|
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| // first map is the iterator, second is for the `Option<_>` | ||
| let result = integer_array | ||
| .iter() | ||
| .map(|integer: Option<i64>| { | ||
| integer | ||
| .map(|integer| match core::char::from_u32(integer as u32) { | ||
| Some(integer) => Ok(integer.to_string()), | ||
| None => { | ||
| exec_err!("requested character too large for encoding.") | ||
| } | ||
| }) | ||
| .transpose() | ||
| }) | ||
| .collect::<Result<StringArray>>()?; | ||
|
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| Ok(Arc::new(result) as ArrayRef) | ||
| } | ||
|
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| #[derive(Debug)] | ||
| pub struct ChrFunc { | ||
| signature: Signature, | ||
| } | ||
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| impl Default for ChrFunc { | ||
| fn default() -> Self { | ||
| Self::new() | ||
| } | ||
| } | ||
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| impl ChrFunc { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| signature: Signature::uniform(1, vec![Int64], Volatility::Immutable), | ||
| } | ||
| } | ||
| } | ||
|
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| impl ScalarUDFImpl for ChrFunc { | ||
| fn as_any(&self) -> &dyn Any { | ||
| self | ||
| } | ||
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| fn name(&self) -> &str { | ||
| "chr" | ||
| } | ||
|
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| fn signature(&self) -> &Signature { | ||
| &self.signature | ||
| } | ||
|
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| fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> { | ||
| Ok(Utf8) | ||
| } | ||
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| fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { | ||
| handle_chr_fn(args) | ||
| } | ||
| } | ||
|
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| fn handle_chr_fn(args: &[ColumnarValue]) -> Result<ColumnarValue> { | ||
| let array = args[0].clone(); | ||
| match array { | ||
| ColumnarValue::Array(array) => { | ||
| let array = chr(&[array])?; | ||
| Ok(ColumnarValue::Array(array)) | ||
| } | ||
| ColumnarValue::Scalar(ScalarValue::Int64(Some(value))) => { | ||
| match core::char::from_u32(value as u32) { | ||
| Some(ch) => Ok(ColumnarValue::Scalar(ScalarValue::Utf8(Some( | ||
| ch.to_string(), | ||
| )))), | ||
| None => exec_err!("requested character too large for encoding."), | ||
| } | ||
| } | ||
| ColumnarValue::Scalar(ScalarValue::Int64(None)) => { | ||
| Ok(ColumnarValue::Scalar(ScalarValue::Utf8(None))) | ||
| } | ||
| _ => exec_err!("The argument must be an Int64 array or scalar."), | ||
| } | ||
| } |
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