Use custom expr equality check in translation and planner

core/translate/expr.rs

@@ -4,7 +4,7 @@ use sqlite3_parser::ast::{self, UnaryOperator};
 use crate::function::JsonFunc;
 use crate::function::{AggFunc, Func, FuncCtx, MathFuncArity, ScalarFunc};
 use crate::schema::Type;
-use crate::util::normalize_ident;
+use crate::util::{exprs_are_equivalent, normalize_ident};
 use crate::vdbe::{builder::ProgramBuilder, BranchOffset, Insn};
 use crate::Result;
 
@@ -554,10 +554,7 @@ pub fn translate_expr(
 ) -> Result<usize> {
     if let Some(precomputed_exprs_to_registers) = precomputed_exprs_to_registers {
         for (precomputed_expr, reg) in precomputed_exprs_to_registers.iter() {
-            // TODO: implement a custom equality check for expressions
-            // there are lots of examples where this breaks, even simple ones like
-            // sum(x) != SUM(x)
-            if expr == *precomputed_expr {
+            if exprs_are_equivalent(expr, precomputed_expr) {
                 program.emit_insn(Insn::Copy {
                     src_reg: *reg,
                     dst_reg: target_register,

core/translate/planner.rs

@@ -4,7 +4,12 @@ use super::{
         Aggregate, BTreeTableReference, Direction, GroupBy, Plan, ResultSetColumn, SourceOperator,
     },
 };
-use crate::{function::Func, schema::Schema, util::normalize_ident, Result};
+use crate::{
+    function::Func,
+    schema::Schema,
+    util::{exprs_are_equivalent, normalize_ident},
+    Result,
+};
 use sqlite3_parser::ast::{self, FromClause, JoinType, ResultColumn};
 
 pub struct OperatorIdCounter {
@@ -23,7 +28,10 @@ impl OperatorIdCounter {
 }
 
 fn resolve_aggregates(expr: &ast::Expr, aggs: &mut Vec<Aggregate>) -> bool {
-    if aggs.iter().any(|a| a.original_expr == *expr) {
+    if aggs
+        .iter()
+        .any(|a| exprs_are_equivalent(&a.original_expr, expr))
+    {
         return true;
     }
     match expr {