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use opposite operator for search if WHERE condition is swapped (e.g. 1 > x instead of x < 1)

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This commit is contained in:
Nikita Sivukhin
2025-02-02 22:00:23 +04:00
parent 7257fb8aae
commit 5a3587f7a2
1 changed files with 13 additions and 2 deletions
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15
core/translate/optimizer.rs
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@@ -474,6 +474,17 @@ impl Optimizable for ast::Expr {
}
}
fn opposite_cmp_op(op: ast::Operator) -> ast::Operator {
match op {
ast::Operator::Equals => ast::Operator::Equals,
ast::Operator::Greater => ast::Operator::Less,
ast::Operator::GreaterEquals => ast::Operator::LessEquals,
ast::Operator::Less => ast::Operator::Greater,
ast::Operator::LessEquals => ast::Operator::GreaterEquals,
_ => panic!("unexpected operator: {:?}", op),
}
}
pub fn try_extract_index_search_expression(
cond: &mut WhereTerm,
table_index: usize,
@@ -533,7 +544,7 @@ pub fn try_extract_index_search_expression(
| ast::Operator::LessEquals => {
let lhs_owned = lhs.take_ownership();
return Ok(Some(Search::RowidSearch {
cmp_op: *operator,
cmp_op: opposite_cmp_op(*operator),
cmp_expr: WhereTerm {
expr: lhs_owned,
from_outer_join: cond.from_outer_join,
@@ -581,7 +592,7 @@ pub fn try_extract_index_search_expression(
let lhs_owned = lhs.take_ownership();
return Ok(Some(Search::IndexSearch {
index: available_indexes[index_index].clone(),
cmp_op: *operator,
cmp_op: opposite_cmp_op(*operator),
cmp_expr: WhereTerm {
expr: lhs_owned,
from_outer_join: cond.from_outer_join,