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conditional_expr.rs
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54 lines (47 loc) · 1.76 KB
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// 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 crate::expr::PyExpr;
use datafusion_expr::conditional_expressions::CaseBuilder;
use pyo3::prelude::*;
#[pyclass(name = "CaseBuilder", module = "datafusion.expr", subclass)]
pub struct PyCaseBuilder {
pub case_builder: CaseBuilder,
}
impl From<PyCaseBuilder> for CaseBuilder {
fn from(case_builder: PyCaseBuilder) -> Self {
case_builder.case_builder
}
}
impl From<CaseBuilder> for PyCaseBuilder {
fn from(case_builder: CaseBuilder) -> PyCaseBuilder {
PyCaseBuilder { case_builder }
}
}
#[pymethods]
impl PyCaseBuilder {
fn when(&mut self, when: PyExpr, then: PyExpr) -> PyCaseBuilder {
PyCaseBuilder {
case_builder: self.case_builder.when(when.expr, then.expr),
}
}
fn otherwise(&mut self, else_expr: PyExpr) -> PyResult<PyExpr> {
Ok(self.case_builder.otherwise(else_expr.expr)?.clone().into())
}
fn end(&mut self) -> PyResult<PyExpr> {
Ok(self.case_builder.end()?.clone().into())
}
}