yyy1000 commented on code in PR #8780:
URL: https://github.com/apache/arrow-datafusion/pull/8780#discussion_r1445405700
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datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
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@@ -224,6 +226,62 @@ impl<S: SimplifyInfo> ExprSimplifier<S> {
}
}
+#[allow(rustdoc::private_intra_doc_links)]
+/// Canonicalize any BinaryExprs that are not in canonical form
+/// <literal> <op> <col> is rewritten to <col> <op> <literal> (remember to
switch the operator)
+/// <col> <op> <literal> is canonical
+/// <col1> <op> <col2> is rewritten so that the name of col1 sorts higher than
col2 (b > a would be canonicalized to a < b)
+struct Canonicalizer {}
+
+impl Canonicalizer {
+ fn new() -> Self {
+ Self {}
+ }
+}
+
+impl TreeNodeRewriter for Canonicalizer {
+ type N = Expr;
+
+ fn mutate(&mut self, expr: Expr) -> Result<Expr> {
+ if let Expr::BinaryExpr(BinaryExpr { left, op, right }) = expr {
+ // Case 1, <col1> <op> <col2>
+ let mut new_expr = BinaryExpr {
+ left: left.clone(),
+ op: op.clone(),
+ right: right.clone(),
+ };
Review Comment:
I use `return` in `if` statement to avoid `new_expr` in the new changes :)
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