jayzhan211 commented on code in PR #12273: URL: https://github.com/apache/datafusion/pull/12273#discussion_r1740230018
########## datafusion/functions-aggregate/src/kurtosis_pop.rs: ########## @@ -0,0 +1,199 @@ +// 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 arrow::array::{Array, ArrayRef, Float64Array, UInt64Array}; +use arrow::compute::cast; +use arrow_schema::{DataType, Field}; +use datafusion_common::{ + downcast_value, plan_err, unwrap_or_internal_err, DataFusionError, Result, + ScalarValue, +}; +use datafusion_expr::{Accumulator, AggregateUDFImpl, Signature, Volatility}; +use datafusion_functions_aggregate_common::accumulator::{ + AccumulatorArgs, StateFieldsArgs, +}; +use std::any::Any; +use std::fmt::Debug; + +make_udaf_expr_and_func!( + KurtosisPopFunction, + kurtosis_pop, + x, + "Calculates the excess kurtosis (Fisher’s definition) without bias correction.", + kurtosis_pop_udaf +); + +pub struct KurtosisPopFunction { + signature: Signature, +} + +impl Debug for KurtosisPopFunction { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + f.debug_struct("KurtosisPopFunction") + .field("signature", &self.signature) + .finish() + } +} + +impl Default for KurtosisPopFunction { + fn default() -> Self { + Self::new() + } +} + +impl KurtosisPopFunction { + pub fn new() -> Self { + Self { + signature: Signature::numeric(1, Volatility::Immutable), Review Comment: @goldmedal If we handle the coercion before the function, they will be coerced to f64, therefore we just need to deal with f64 only -- 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: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
