fix

Author: James Cor

sql/memo/rel_props.go

@@ -789,17 +789,10 @@ func sortedColsForRel(rel RelExpr) sql.Schema {
 		}
 	case *MergeJoin:
 		var ret sql.Schema
-		for _, e := range r.InnerScan.Table.Index().Expressions() {
+		for _, e := range r.InnerScan.Table.Index().UnqualifiedExpressions() {
 			// TODO columns can have "." characters, this will miss cases
-			parts := strings.Split(e, ".")
-			var name string
-			if len(parts) == 2 {
-				name = parts[1]
-			} else {
-				return nil
-			}
 			ret = append(ret, &sql.Column{
-				Name:     strings.ToLower(name),
+				Name:     strings.ToLower(e),
 				Source:   strings.ToLower(r.InnerScan.Table.Name()),
 				Nullable: true},
 			)

sql/memo/rel_props_test.go

@@ -2,6 +2,7 @@ package memo
 
 import (
 	"fmt"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -218,7 +219,11 @@ func (i dummyIndex) Expressions() []string {
 }
 
 func (i dummyIndex) UnqualifiedExpressions() []string {
-	return i.cols
+	res := make([]string, len(i.cols))
+	for idx, col := range i.cols {
+		res[idx] = col[strings.IndexByte(col, '.')+1:]
+	}
+	return res
 }
 
 func (dummyIndex) IsUnique() bool {