Changing selectExprNeedsAlias to consider string literal quotes

sql/planbuilder/project.go

@@ -243,5 +243,14 @@ func selectExprNeedsAlias(e *ast.AliasedExpr, expr sql.Expression) bool {
 		}
 	})
 
-	return complex || e.InputExpression != expr.String()
+	// If the expression's string representation is quoted, trim the quotes before comparing it to the input expression.
+	// InputExpression is assigned in the Vitess layer, and it always trims quotes at that time, too.
+	exprString := expr.String()
+	if strings.HasPrefix(exprString, "'") && strings.HasSuffix(exprString, "'") {
+		exprString = exprString[1 : len(exprString)-1]
+	}
+
+	// If the expression's input value matches expr.String(), then we know that it is referenceable and
+	// does not need an alias.
+	return complex || e.InputExpression != exprString
 }