Remove xiter dependency

Drop spheric.cloud/xiter and replace its usages with stdlib iter and a simple loop.

- Remove xiter from go.mod
- Add collectRows helper in integration_test.go
- Rewrite RowToListValue with a preallocated slice
- Delete unused internal/util.go

Author: apstndb

go.mod

@@ -24,7 +24,6 @@ require (
 	google.golang.org/grpc v1.79.3
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/yaml.v3 v3.0.1
-	spheric.cloud/xiter v0.0.0-20240904151420-c999f37a46b2
 )
 
 require (

go.sum

@@ -1806,5 +1806,3 @@ rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-spheric.cloud/xiter v0.0.0-20240904151420-c999f37a46b2 h1:/2/LZep2TpsdSwYhdMsGRh+OVun1UMYlMEip4EEsgg8=
-spheric.cloud/xiter v0.0.0-20240904151420-c999f37a46b2/go.mod h1:i4SlkNfFrn1974zbGZWg8FYXAWLnrS6cYAXtSfmIDhU=

integration_test.go

@@ -6,6 +6,7 @@ import (
 	_ "embed"
 	"encoding/csv"
 	"fmt"
+	"iter"
 	"strings"
 	"testing"
 
@@ -17,7 +18,6 @@ import (
 	"github.com/google/go-cmp/cmp"
 	"google.golang.org/protobuf/testing/protocmp"
 	"google.golang.org/protobuf/types/known/structpb"
-	"spheric.cloud/xiter"
 
 	"github.com/apstndb/execspansql/jqresult"
 	"github.com/apstndb/execspansql/params"
@@ -30,6 +30,17 @@ var ddl string
 //go:embed testdata/dml.sql
 var dml string
 
+func collectRows(seq iter.Seq2[*spanner.Row, error]) ([]*spanner.Row, error) {
+	var rows []*spanner.Row
+	for row, err := range seq {
+		if err != nil {
+			return nil, err
+		}
+		rows = append(rows, row)
+	}
+	return rows, nil
+}
+
 func runEagerReadWriteDML(t *testing.T, client *spanner.Client, ctx context.Context, sql, filter string) []any {
 	t.Helper()
 
@@ -298,7 +309,7 @@ func TestWithCloudSpannerEmulator(t *testing.T) {
 					spanner.Statement{SQL: "SELECT @v AS v", Params: params},
 					spanner.QueryOptions{Mode: sppb.ExecuteSqlRequest_NORMAL.Enum()})
 
-				rows, err := xiter.TryCollect(spaniter.RowIteratorSeq(rowIter))
+				rows, err := collectRows(spaniter.RowIteratorSeq(rowIter))
 				if err != nil {
 					t.Error(err)
 					return

internal/util.go

@@ -1,14 +1,15 @@
 package resultset
 
 import (
-	"slices"
-	"spheric.cloud/xiter"
-
 	"cloud.google.com/go/spanner"
 	"google.golang.org/protobuf/types/known/structpb"
 )
 
 // RowToListValue converts a Spanner row to structpb.ListValue.
 func RowToListValue(r *spanner.Row) *structpb.ListValue {
-	return &structpb.ListValue{Values: slices.Collect(xiter.Map(xiter.Range(0, r.Size()), r.ColumnValue))}
+	values := make([]*structpb.Value, r.Size())
+	for i := range values {
+		values[i] = r.ColumnValue(i)
+	}
+	return &structpb.ListValue{Values: values}
 }