alamb commented on code in PR #14579: URL: https://github.com/apache/datafusion/pull/14579#discussion_r1961592529
########## datafusion/ffi/src/udf.rs: ########## @@ -0,0 +1,346 @@ +// 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::{ffi::c_void, sync::Arc}; + +use abi_stable::{ + std_types::{RResult, RString, RVec}, + StableAbi, +}; +use arrow::datatypes::DataType; +use arrow::{ + array::ArrayRef, + error::ArrowError, + ffi::{from_ffi, to_ffi, FFI_ArrowSchema}, +}; +use datafusion::{ + error::DataFusionError, + logical_expr::type_coercion::functions::data_types_with_scalar_udf, +}; +use datafusion::{ + error::Result, + logical_expr::{ + ColumnarValue, ScalarFunctionArgs, ScalarUDF, ScalarUDFImpl, Signature, + }, +}; + +use crate::{ + arrow_wrappers::{WrappedArray, WrappedSchema}, + df_result, rresult, rresult_return, + util::{rvec_wrapped_to_vec_datatype, vec_datatype_to_rvec_wrapped}, + volatility::FFI_Volatility, +}; + +/// A stable struct for sharing a [`ScalarUDF`] across FFI boundaries. +#[repr(C)] +#[derive(Debug, StableAbi)] +#[allow(non_camel_case_types)] +pub struct FFI_ScalarUDF { + /// Return the udf name. + pub name: RString, + + pub aliases: RVec<RString>, + + pub volatility: FFI_Volatility, + + pub return_type: unsafe extern "C" fn( Review Comment: Eventually it would be great to document these a bit more -- for example here we can mention that we only expose the return type method to simplify the signature -- 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
