paleolimbot commented on code in PR #76: URL: https://github.com/apache/sedona-db/pull/76#discussion_r2345796853
########## rust/sedona-geo/src/st_perimeter.rs: ########## @@ -0,0 +1,142 @@ +// 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::sync::Arc; + +use arrow_array::builder::Float64Builder; +use arrow_schema::DataType; +use datafusion_common::error::Result; +use datafusion_expr::ColumnarValue; +use geo_generic_alg::algorithm::{line_measures::Euclidean, LengthMeasurableExt}; +use sedona_expr::scalar_udf::{ScalarKernelRef, SedonaScalarKernel}; +use sedona_functions::executor::WkbExecutor; +use sedona_schema::{datatypes::SedonaType, matchers::ArgMatcher}; +use wkb::reader::Wkb; + +/// ST_Perimeter() implementation using [LengthMeasurableExt::perimeter_ext] with Euclidean metric +pub fn st_perimeter_impl() -> ScalarKernelRef { + Arc::new(STPerimeter {}) +} + +#[derive(Debug)] +struct STPerimeter {} + +impl SedonaScalarKernel for STPerimeter { + fn return_type(&self, args: &[SedonaType]) -> Result<Option<SedonaType>> { + let matcher = ArgMatcher::new( + vec![ArgMatcher::is_geometry()], + SedonaType::Arrow(DataType::Float64), + ); + + matcher.match_args(args) + } + + fn invoke_batch( + &self, + arg_types: &[SedonaType], + args: &[ColumnarValue], + ) -> Result<ColumnarValue> { + let executor = WkbExecutor::new(arg_types, args); + let mut builder = Float64Builder::with_capacity(executor.num_iterations()); + executor.execute_wkb_void(|maybe_wkb| { + match maybe_wkb { + Some(wkb) => { + builder.append_value(invoke_scalar(&wkb)?); + } + _ => builder.append_null(), + } + + Ok(()) + })?; + + executor.finish(Arc::new(builder.finish())) + } +} + +fn invoke_scalar(wkb: &Wkb) -> Result<f64> { + Ok(wkb.perimeter_ext(&Euclidean)) Review Comment: In the GEOS version I believe peter handled the 0.0 output for non-polygon inputs here. (This works too, though!) -- 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]
