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core/src/execution/datafusion/expressions/scalar_funcs/unhex.rs
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| // 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::sync::Arc; | ||
|
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| use arrow_array::{Array, OffsetSizeTrait}; | ||
| use arrow_schema::DataType; | ||
| use datafusion::logical_expr::ColumnarValue; | ||
| use datafusion_common::{cast::as_generic_string_array, exec_err, DataFusionError, ScalarValue}; | ||
|
|
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| fn unhex(string: &str, result: &mut Vec<u8>) -> Result<(), DataFusionError> { | ||
| if string.is_empty() { | ||
| return Ok(()); | ||
| } | ||
|
|
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| // Adjust the string if it has an odd length, and prepare to add a padding byte if needed. | ||
| let needs_padding = string.len() % 2 != 0; | ||
| let adjusted_string = if needs_padding { &string[1..] } else { string }; | ||
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| let mut iter = adjusted_string.chars().peekable(); | ||
| while let (Some(high_char), Some(low_char)) = (iter.next(), iter.next()) { | ||
| let high = high_char | ||
| .to_digit(16) | ||
| .ok_or_else(|| DataFusionError::Internal("Invalid hex character".to_string()))?; | ||
| let low = low_char | ||
| .to_digit(16) | ||
| .ok_or_else(|| DataFusionError::Internal("Invalid hex character".to_string()))?; | ||
|
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| result.push((high << 4 | low) as u8); | ||
| } | ||
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| if needs_padding { | ||
| result.push(0); | ||
| } | ||
|
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| Ok(()) | ||
| } | ||
|
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| fn spark_unhex_inner<T: OffsetSizeTrait>( | ||
| array: &ColumnarValue, | ||
| fail_on_error: bool, | ||
| ) -> Result<ColumnarValue, DataFusionError> { | ||
| match array { | ||
| ColumnarValue::Array(array) => { | ||
| let string_array = as_generic_string_array::<T>(array)?; | ||
|
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| let mut builder = arrow::array::BinaryBuilder::new(); | ||
| let mut encoded = Vec::new(); | ||
|
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| for i in 0..string_array.len() { | ||
| let string = string_array.value(i); | ||
|
|
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| if unhex(string, &mut encoded).is_ok() { | ||
| builder.append_value(encoded.as_slice()); | ||
| encoded.clear(); | ||
| } else if fail_on_error { | ||
| return exec_err!("Input to unhex is not a valid hex string: {string}"); | ||
| } else { | ||
| builder.append_null(); | ||
| } | ||
| } | ||
| Ok(ColumnarValue::Array(Arc::new(builder.finish()))) | ||
| } | ||
| ColumnarValue::Scalar(ScalarValue::Utf8(Some(string))) => { | ||
| let mut encoded = Vec::new(); | ||
|
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| if unhex(string, &mut encoded).is_ok() { | ||
| Ok(ColumnarValue::Scalar(ScalarValue::Binary(Some(encoded)))) | ||
| } else if fail_on_error { | ||
| exec_err!("Input to unhex is not a valid hex string: {string}") | ||
| } else { | ||
| Ok(ColumnarValue::Scalar(ScalarValue::Binary(None))) | ||
| } | ||
| } | ||
| _ => { | ||
| exec_err!( | ||
| "The first argument must be a string scalar or array, but got: {:?}", | ||
| array | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
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||
| pub(super) fn spark_unhex(args: &[ColumnarValue]) -> Result<ColumnarValue, DataFusionError> { | ||
| if args.len() > 2 { | ||
| return exec_err!("unhex takes at most 2 arguments, but got: {}", args.len()); | ||
| } | ||
|
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||
| let val_to_unhex = &args[0]; | ||
| let fail_on_error = if args.len() == 2 { | ||
| match &args[1] { | ||
| ColumnarValue::Scalar(ScalarValue::Boolean(Some(fail_on_error))) => *fail_on_error, | ||
| _ => { | ||
| return exec_err!( | ||
| "The second argument must be boolean scalar, but got: {:?}", | ||
| args[1] | ||
| ); | ||
| } | ||
| } | ||
| } else { | ||
| false | ||
| }; | ||
|
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||
| match val_to_unhex.data_type() { | ||
| DataType::Utf8 => spark_unhex_inner::<i32>(val_to_unhex, fail_on_error), | ||
| DataType::LargeUtf8 => spark_unhex_inner::<i64>(val_to_unhex, fail_on_error), | ||
| other => exec_err!( | ||
| "The first argument must be a string scalar or array, but got: {:?}", | ||
| other | ||
| ), | ||
| } | ||
| } | ||
|
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| #[cfg(test)] | ||
| mod test { | ||
| use super::unhex; | ||
|
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| #[test] | ||
| fn test_unhex() -> Result<(), Box<dyn std::error::Error>> { | ||
| let mut result = Vec::new(); | ||
|
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| unhex("537061726B2053514C", &mut result)?; | ||
| let result_str = std::str::from_utf8(&result)?; | ||
| assert_eq!(result_str, "Spark SQL"); | ||
| result.clear(); | ||
|
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| assert!(unhex("hello", &mut result).is_err()); | ||
| result.clear(); | ||
|
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| unhex("", &mut result)?; | ||
| assert!(result.is_empty()); | ||
|
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| Ok(()) | ||
| } | ||
| } |