fixed TableDelta.IsKeyless()

bats/keyless.bats

@@ -189,6 +189,7 @@ SQL
     run dolt --keyless sql -q "
         SELECT to_c0, to_c1, from_c0, from_c1
         FROM dolt_diff_keyless
+        WHERE from_commit = hashof('HEAD')
         ORDER BY to_commit_date" -r csv
     [ $status -eq 0 ]
     [[ "${lines[0]}"  = "to_c0,to_c1,from_c0,from_c1"  ]] || false
@@ -198,10 +199,6 @@ SQL
     [[ "${lines[4]}"  = "1,9,,"  ]] || false
     [[ "${lines[5]}"  = "1,9,,"  ]] || false
     [[ "${lines[6]}"  = ",,0,0"  ]] || false
-    [[ "${lines[7]}"  = "1,1,,"  ]] || false
-    [[ "${lines[8]}"  = "1,1,,"  ]] || false
-    [[ "${lines[9]}"  = "0,0,,"  ]] || false
-    [[ "${lines[10]}" = "2,2,,"  ]] || false
 }
 
 @test "keyless diff column add/drop" {

go/cmd/dolt/commands/diff.go

@@ -641,6 +641,9 @@ func diffRows(ctx context.Context, td diff.TableDelta, dArgs *diffArgs) errhand.
 	if err != nil {
 		return errhand.BuildDError("cannot retrieve schema for table %s", td.ToName).AddCause(err).Build()
 	}
+	if td.IsAdd() {
+		fromSch = toSch
+	}
 
 	fromRows, toRows, err := td.GetMaps(ctx)
 	if err != nil {

go/libraries/doltcore/schema/schema.go

@@ -55,7 +55,8 @@ func ExtractAllColNames(sch Schema) (map[uint64]string, error) {
 }
 
 func IsKeyless(sch Schema) bool {
-	return sch.GetPKCols().Size() == 0
+	return sch.GetPKCols().Size() == 0 &&
+		sch.GetAllCols().Size() != 0
 }
 
 // TODO: this function never returns an error