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Refactor timeslot into round function
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Copyright 2020 Datafuse Labs. | ||
| // | ||
| // Licensed 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. | ||
|
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| use std::fmt; | ||
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| use common_datavalues::prelude::*; | ||
| use common_exception::Result; | ||
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| use crate::scalars::Function; | ||
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| #[derive(Clone)] | ||
| pub struct RoundFunction { | ||
| display_name: String, | ||
| round: u32, | ||
| } | ||
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| impl RoundFunction { | ||
| pub fn try_create(display_name: &str, round: u32) -> Result<Box<dyn Function>> { | ||
| let s = Self { | ||
| display_name: display_name.to_owned(), | ||
| round, | ||
| }; | ||
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|
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| Ok(Box::new(s)) | ||
| } | ||
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| // TODO: (sundy-li) | ||
| // Consider about the timezones/offsets | ||
| // Currently: assuming timezone offset is a multiple of round. | ||
| #[inline] | ||
| fn execute(&self, time: u32) -> u32 { | ||
| time / self.round * self.round | ||
| } | ||
| } | ||
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| impl Function for RoundFunction { | ||
| fn name(&self) -> &str { | ||
| self.display_name.as_str() | ||
| } | ||
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| fn return_type(&self, _args: &[DataType]) -> Result<DataType> { | ||
| Ok(DataType::DateTime32(None)) | ||
| } | ||
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| fn nullable(&self, _input_schema: &DataSchema) -> Result<bool> { | ||
| Ok(false) | ||
| } | ||
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| fn eval(&self, columns: &DataColumnsWithField, _input_rows: usize) -> Result<DataColumn> { | ||
| match columns[0].column() { | ||
| DataColumn::Array(array) => { | ||
| let array = array.u32()?; | ||
| let arr = array.apply(|x| self.execute(x)); | ||
| Ok(DataColumn::Array(arr.into_series())) | ||
| } | ||
| DataColumn::Constant(v, rows) => { | ||
| if v.is_null() { | ||
| return Ok(DataColumn::Constant(DataValue::UInt32(None), *rows)); | ||
| } | ||
| let value = v.as_u64()?; | ||
| Ok(DataColumn::Constant( | ||
| DataValue::UInt32(Some(self.execute(value as u32))), | ||
| *rows, | ||
| )) | ||
| } | ||
| } | ||
| } | ||
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| fn num_arguments(&self) -> usize { | ||
| 1 | ||
| } | ||
| } | ||
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| impl fmt::Display for RoundFunction { | ||
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { | ||
| write!(f, "{}", self.display_name) | ||
| } | ||
| } |
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