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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 datafusion::logical_expr::logical_plan::{Join, JoinConstraint, JoinType};

use pyo3::{prelude::*, IntoPyObjectExt};

use std::fmt::{self, Display, Formatter};

use crate::common::df_schema::PyDFSchema;

use crate::expr::{logical_node::LogicalNode, PyExpr};

use crate::sql::logical::PyLogicalPlan;

#[derive(Debug, Clone, PartialEq, Eq, Hash)]

#[pyclass(name = "JoinType", module = "datafusion.expr")]

pub struct PyJoinType {

join_type: JoinType,

}

impl From<JoinType> for PyJoinType {

fn from(join_type: JoinType) -> PyJoinType {

PyJoinType { join_type }

}

}

impl From<PyJoinType> for JoinType {

fn from(join_type: PyJoinType) -> Self {

join_type.join_type

}

}

#[pymethods]

impl PyJoinType {

pub fn is_outer(&self) -> bool {

self.join_type.is_outer()

}

fn __repr__(&self) -> PyResult<String> {

Ok(format!("{}", self.join_type))

}

}

impl Display for PyJoinType {

fn fmt(&self, f: &mut Formatter) -> fmt::Result {

write!(f, "{}", self.join_type)

}

}

#[derive(Debug, Clone, Copy)]

#[pyclass(name = "JoinConstraint", module = "datafusion.expr")]

pub struct PyJoinConstraint {

join_constraint: JoinConstraint,

}

impl From<JoinConstraint> for PyJoinConstraint {

fn from(join_constraint: JoinConstraint) -> PyJoinConstraint {

PyJoinConstraint { join_constraint }

}

}

impl From<PyJoinConstraint> for JoinConstraint {

fn from(join_constraint: PyJoinConstraint) -> Self {

join_constraint.join_constraint

}

}

#[pymethods]

impl PyJoinConstraint {

fn __repr__(&self) -> PyResult<String> {

match self.join_constraint {

JoinConstraint::On => Ok("On".to_string()),

JoinConstraint::Using => Ok("Using".to_string()),

}

}

}

#[pyclass(name = "Join", module = "datafusion.expr", subclass)]

#[derive(Clone)]

pub struct PyJoin {

join: Join,

}

impl From<Join> for PyJoin {

fn from(join: Join) -> PyJoin {

PyJoin { join }

}

}

impl From<PyJoin> for Join {

fn from(join: PyJoin) -> Self {

join.join

}

}

impl Display for PyJoin {

fn fmt(&self, f: &mut Formatter) -> fmt::Result {

write!(

f,

"Join

Left: {:?}

Right: {:?}

On: {:?}

Filter: {:?}

JoinType: {:?}

JoinConstraint: {:?}

Schema: {:?}

NullEqualsNull: {:?}",

&self.join.left,

&self.join.right,

&self.join.on,

&self.join.filter,

&self.join.join_type,

&self.join.join_constraint,

&self.join.schema,

&self.join.null_equals_null,

)

}

}

#[pymethods]

impl PyJoin {

/// Retrieves the left input `LogicalPlan` to this `Join` node

fn left(&self) -> PyResult<PyLogicalPlan> {

Ok(self.join.left.as_ref().clone().into())

}

/// Retrieves the right input `LogicalPlan` to this `Join` node

fn right(&self) -> PyResult<PyLogicalPlan> {

Ok(self.join.right.as_ref().clone().into())

}

/// Retrieves the right input `LogicalPlan` to this `Join` node

fn on(&self) -> PyResult<Vec<(PyExpr, PyExpr)>> {

Ok(self

.join

.on

.iter()

.map(|(l, r)| (PyExpr::from(l.clone()), PyExpr::from(r.clone())))

.collect())

}

/// Retrieves the filter `Option<PyExpr>` of this `Join` node

fn filter(&self) -> PyResult<Option<PyExpr>> {

Ok(self.join.filter.clone().map(Into::into))

}

/// Retrieves the `JoinType` to this `Join` node

fn join_type(&self) -> PyResult<PyJoinType> {

Ok(self.join.join_type.into())

}

/// Retrieves the `JoinConstraint` to this `Join` node

fn join_constraint(&self) -> PyResult<PyJoinConstraint> {

Ok(self.join.join_constraint.into())

}

/// Resulting Schema for this `Join` node instance

fn schema(&self) -> PyResult<PyDFSchema> {

Ok(self.join.schema.as_ref().clone().into())

}

/// If null_equals_null is true, null == null else null != null

fn null_equals_null(&self) -> PyResult<bool> {

Ok(self.join.null_equals_null)

}

fn __repr__(&self) -> PyResult<String> {

Ok(format!("Join({})", self))

}

fn __name__(&self) -> PyResult<String> {

Ok("Join".to_string())

}

}

impl LogicalNode for PyJoin {

fn inputs(&self) -> Vec<PyLogicalPlan> {

vec![

PyLogicalPlan::from((*self.join.left).clone()),

PyLogicalPlan::from((*self.join.right).clone()),

]

}

fn to_variant<'py>(&self, py: Python<'py>) -> PyResult<Bound<'py, PyAny>> {

self.clone().into_bound_py_any(py)

}

}