alamb commented on code in PR #9537: URL: https://github.com/apache/arrow-datafusion/pull/9537#discussion_r1520417551
########## datafusion/functions/src/datetime/current_date.rs: ########## @@ -0,0 +1,92 @@ +// 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::any::Any; + +use arrow::datatypes::DataType; +use arrow::datatypes::DataType::Date32; +use chrono::{Datelike, NaiveDate}; + +use datafusion_common::{internal_err, Result, ScalarValue}; +use datafusion_expr::simplify::{ExprSimplifyResult, SimplifyInfo}; +use datafusion_expr::{ColumnarValue, Expr, ScalarUDFImpl, Signature, Volatility}; + +#[derive(Debug)] +pub(super) struct CurrentDateFunc { + signature: Signature, + aliases: Vec<String>, +} + +impl CurrentDateFunc { + pub fn new() -> Self { + Self { + signature: Signature::uniform(0, vec![], Volatility::Stable), + aliases: vec![String::from("today")], + } + } +} + +/// Create an implementation of `current_date()` that always returns the +/// specified current date. +/// +/// The semantics of `current_date()` require it to return the same value +/// wherever it appears within a single statement. This value is +/// chosen during planning time. +impl ScalarUDFImpl for CurrentDateFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "current_date" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> { + Ok(Date32) + } + + fn invoke(&self, _args: &[ColumnarValue]) -> Result<ColumnarValue> { + internal_err!( + "invoke should not be called on a simplified current_date() function" + ) + } + + fn aliases(&self) -> &[String] { + &self.aliases + } + + fn simplify( + &self, + _args: Vec<Expr>, + info: &dyn SimplifyInfo, + ) -> Result<ExprSimplifyResult> { + let now_ts = info.execution_props().query_execution_start_time; Review Comment: 👍 -- 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...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
