aljaz/turso
1
0
Fork 0
mirror of https://github.com/aljazceru/turso.git synced 2026-01-05 01:04:22 +01:00
Code Issues Packages Projects Releases Wiki Activity

Add in expr optimization at the parser level instead of translation.

Browse Source 
lhs IN () and lhs NOT IN () can be translated to false and true.
This commit is contained in:
Diego Reis
2025-10-06 21:34:54 -03:00
parent 70fc509046
commit 52ed0f7997
2 changed files with 17 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
parser/src/parser.rs
View File

@@ -1723,11 +1723,23 @@ impl<'a> Parser<'a> {
_ => {
let exprs = self.parse_expr_list()?;
eat_expect!(self, TK_RP);
Box::new(Expr::InList {
lhs: result,
not,
rhs: exprs,
})
// Expressions in the form:
// lhs IN ()
// lhs NOT IN ()
// can be simplified to constants 0 (false) and 1 (true), respectively.
//
// todo: should check if lhs has a function. If so, this optimization cannot
// be done.
if exprs.is_empty() {
let name = if not { "1" } else { "0" };
Box::new(Expr::Literal(Literal::Numeric(name.into())))
} else {
Box::new(Expr::InList {
lhs: result,
not,
rhs: exprs,
})
}
}
}
}