Weijun-H commented on code in PR #12194: URL: https://github.com/apache/datafusion/pull/12194#discussion_r1739647379
########## datafusion/functions-nested/src/map_values.rs: ########## @@ -0,0 +1,102 @@ +// 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. + +//! [`ScalarUDFImpl`] definitions for map_values function. + +use crate::utils::{get_map_entry_field, make_scalar_function}; +use arrow_array::{Array, ArrayRef, ListArray}; +use arrow_schema::{DataType, Field}; +use datafusion_common::{cast::as_map_array, exec_err, Result}; +use datafusion_expr::{ + ArrayFunctionSignature, ColumnarValue, ScalarUDFImpl, Signature, TypeSignature, + Volatility, +}; +use std::any::Any; +use std::sync::Arc; + +make_udf_expr_and_func!( + MapValuesFunc, + map_values, + map, + "Return a list of all values in the map.", + map_values_udf +); + +#[derive(Debug)] +pub(crate) struct MapValuesFunc { + signature: Signature, +} + +impl MapValuesFunc { + pub fn new() -> Self { + Self { + signature: Signature::new( + TypeSignature::ArraySignature(ArrayFunctionSignature::MapArray), + Volatility::Immutable, + ), + } + } +} + +impl ScalarUDFImpl for MapValuesFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "map_values" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, arg_types: &[DataType]) -> datafusion_common::Result<DataType> { + if arg_types.len() != 1 { + return exec_err!("map_values expects single argument"); + } + let map_type = &arg_types[0]; + let map_fields = get_map_entry_field(map_type)?; + Ok(DataType::List(Arc::new(Field::new( + "item", + map_fields.last().unwrap().data_type().clone(), + true, + )))) + } + + fn invoke(&self, args: &[ColumnarValue]) -> datafusion_common::Result<ColumnarValue> { + make_scalar_function(map_values_inner)(args) + } +} + +fn map_values_inner(args: &[ArrayRef]) -> Result<ArrayRef> { + if args.len() != 1 { + return exec_err!("map_keys expects single argument"); Review Comment: ```suggestion return exec_err!("map_values expects single argument"); ``` -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
