davidlghellin commented on code in PR #17424: URL: https://github.com/apache/datafusion/pull/17424#discussion_r2352983828
########## datafusion/functions/src/datetime/make_interval.rs: ########## @@ -0,0 +1,618 @@ +// 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 std::sync::Arc; + +use crate::utils::make_scalar_function; +use arrow::array::{ + Array, ArrayRef, IntervalMonthDayNanoBuilder, PrimitiveArray, PrimitiveBuilder, +}; +use arrow::datatypes::DataType::Interval; +use arrow::datatypes::IntervalUnit::MonthDayNano; +use arrow::datatypes::{DataType, IntervalMonthDayNano, IntervalMonthDayNanoType}; +use datafusion_common::{exec_err, plan_datafusion_err, DataFusionError, Result}; +use datafusion_expr::{ + ColumnarValue, Documentation, ScalarFunctionArgs, ScalarUDFImpl, Signature, + Volatility, +}; +use datafusion_macros::user_doc; + +#[user_doc( + doc_section(label = "Time and Date Functions"), + description = "Construct an INTERVAL (MonthDayNano) from component parts. Missing arguments default to 0; if any provided argument is NULL on a row, the result is NULL.", + syntax_example = "make_interval([years[, months[, weeks[, days[, hours[, mins[, secs]]]]]])", + sql_example = r#"```sql +-- Inline example without creating a table +> SELECT + y, m, w, d, h, mi, s, + make_interval(y, m, w, d, h, mi, s) AS interval + FROM VALUES + (1, 1, 1, 1, 1, 1, 1.0) + AS v(y, m, w, d, h, mi, s); ++---+---+---+---+---+---+---+---------------------------------------------------+ +|y |m |w |d |h |mi |s |interval | ++---+---+---+---+---+---+---+---------------------------------------------------+ +|1 |1 |1 |1 |1 |1 |1.0|1 years 1 months 8 days 1 hours 1 minutes 1 seconds| ++---+---+---+---+---+---+---+---------------------------------------------------+ +```"#, + argument( + name = "years", + description = "Years to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "months", + description = "Months to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "weeks", + description = "Weeks to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "days", + description = "Days to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "hours", + description = "Hours to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "mins", + description = "Minutes to use when making the interval. Optional; defaults to 0. Can be a constant, column or function, and any combination of arithmetic operators." + ), + argument( + name = "secs", + description = "Seconds to use when making the interval (may be fractional). Optional; defaults to 0. Must be finite (not NaN/±Inf). Can be a constant, column or function, and any combination of arithmetic operators." + ) +)] +#[derive(Debug, PartialEq, Eq, Hash)] +pub struct MakeIntervalFunc { + signature: Signature, +} + +impl Default for MakeIntervalFunc { + fn default() -> Self { + Self::new() + } +} + +impl MakeIntervalFunc { + pub fn new() -> Self { + Self { + signature: Signature::user_defined(Volatility::Immutable), + } + } +} + +impl ScalarUDFImpl for MakeIntervalFunc { + fn as_any(&self) -> &dyn Any { + self + } + + fn name(&self) -> &str { + "make_interval" + } + + fn signature(&self) -> &Signature { + &self.signature + } + + fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> { + Ok(Interval(MonthDayNano)) + } + + fn invoke_with_args(&self, args: ScalarFunctionArgs) -> Result<ColumnarValue> { + if args.args.is_empty() { + let n: usize = std::cmp::max(args.number_rows, 1); + let mut b: PrimitiveBuilder<IntervalMonthDayNanoType> = + IntervalMonthDayNanoBuilder::with_capacity(n); + for _ in 0..n { + b.append_value(IntervalMonthDayNano::new(0, 0, 0)); + } + return Ok(ColumnarValue::Array(Arc::new(b.finish()))); + } + make_scalar_function(make_interval_kernel, vec![])(&args.args) + } + + fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>> { + let length = arg_types.len(); + match length { + x if x > 7 => { + exec_err!( + "make_interval expects between 1 and 7, got {}", + arg_types.len() + ) + } + _ => Ok((0..arg_types.len()) + .map(|i| { + if i == 6 { + DataType::Float64 + } else { + DataType::Int32 + } + }) + .collect()), + } + } + + fn documentation(&self) -> Option<&Documentation> { + self.doc() + } +} + +fn make_interval_kernel(args: &[ArrayRef]) -> Result<ArrayRef, DataFusionError> { + use arrow::array::AsArray; + use arrow::datatypes::{Float64Type, Int32Type}; + + // 0 args is in invoke_with_args + if args.is_empty() || args.len() > 7 { + return exec_err!("make_interval expects between 0 and 7, got {}", args.len()); + } + + let n_rows = args[0].len(); + for (i, a) in args.iter().enumerate().skip(1) { + if a.len() != n_rows { + return exec_err!( + "make_dt_interval: argument {i} has length {}, expected {n_rows}", + a.len() + ); + } + } Review Comment: ok, It is not necessary. -- This is an automated message from the Apache Git Service. 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