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use std::cmp::Ordering;
use crate::condition::*;
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum JoinTestField {
Field1,
Field2,
Field3,
}
#[derive(Debug, PartialEq, Eq)]
pub struct JoinNodeTest {
pub f1: JoinTestField,
pub condition_number_of_arg2: usize,
pub f2: JoinTestField,
}
impl Ord for JoinNodeTest {
fn cmp(&self, other: &Self) -> Ordering {
self.condition_number_of_arg2.cmp(&other.condition_number_of_arg2)
}
}
impl PartialOrd for JoinNodeTest {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.condition_number_of_arg2.partial_cmp(&other.condition_number_of_arg2)
}
}
fn condition_internal_match_field1(condition: &ConditionBody, variable: &String, result: &mut Vec<JoinNodeTest>) {
if let ConditionField::Variable(other_var) = &condition.f2 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field1, condition_number_of_arg2: 0, f2: JoinTestField::Field2 });
}
}
if let ConditionField::Variable(other_var) = &condition.f3 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field1, condition_number_of_arg2: 0, f2: JoinTestField::Field3 });
}
}
}
fn condition_internal_match_field2(condition: &ConditionBody, variable: &String, result: &mut Vec<JoinNodeTest>) {
if let ConditionField::Variable(other_var) = &condition.f3 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field2, condition_number_of_arg2: 0, f2: JoinTestField::Field3 });
}
}
}
pub fn get_join_tests_from_condition(condition: &Condition, earlier: &[Condition]) -> Vec<JoinNodeTest> {
let mut result: Vec<JoinNodeTest> = Vec::new();
match &condition {
Condition::Positive(cond) | Condition::Negative(cond) => {
if let ConditionField::Variable(variable) = &cond.f1 {
condition_internal_match_field1(cond, variable, &mut result);
for (i, other_cond) in earlier.iter().rev().enumerate() {
match &other_cond {
Condition::Positive(oc) => {
if let ConditionField::Variable(other_var) = &oc.f1 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field1, condition_number_of_arg2: i + 1, f2: JoinTestField::Field1 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f2 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field1, condition_number_of_arg2: i + 1, f2: JoinTestField::Field2 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f3 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field1, condition_number_of_arg2: i + 1, f2: JoinTestField::Field3 });
break;
}
}
}
_ => {}
}
}
}
if let ConditionField::Variable(variable) = &cond.f2 {
condition_internal_match_field2(cond, variable, &mut result);
for (i, other_cond) in earlier.iter().rev().enumerate() {
match &other_cond {
Condition::Positive(oc) => {
if let ConditionField::Variable(other_var) = &oc.f1 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field2, condition_number_of_arg2: i + 1, f2: JoinTestField::Field1 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f2 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field2, condition_number_of_arg2: i + 1, f2: JoinTestField::Field2 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f3 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field2, condition_number_of_arg2: i + 1, f2: JoinTestField::Field3 });
break;
}
}
}
_ => {}
}
}
}
if let ConditionField::Variable(variable) = &cond.f3 {
for (i, other_cond) in earlier.iter().rev().enumerate() {
match &other_cond {
Condition::Positive(oc) => {
if let ConditionField::Variable(other_var) = &oc.f1 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field3, condition_number_of_arg2: i + 1, f2: JoinTestField::Field1 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f2 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field3, condition_number_of_arg2: i + 1, f2: JoinTestField::Field2 });
break;
}
}
if let ConditionField::Variable(other_var) = &oc.f3 {
if *variable == *other_var {
result.push(JoinNodeTest { f1: JoinTestField::Field3, condition_number_of_arg2: i + 1, f2: JoinTestField::Field3 });
break;
}
}
}
_ => {}
}
}
}
}
_ => {}
}
result.sort();
result
}