Merge pull request #464 from ydb-platform/is-table-exists

* Added `sugar.IsTableExists()` helper for check existence of table

Author: asmyasnikov

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Added `meta.ConsumedUnits(metadata.MD)` method for getting consumed units from metadata
 * Added `NestedCall` field to retry trace start infos for alarm on nested calls
 * Added `topicoptions.WithWriterTrace` option for attach tracer into separated writer
+* Added `sugar.IsTableExists()` helper for check existence of table
 
 ## v3.39.0
 * Removed message level partitioning from experimental topic API. It is unavailable on server side yet.

sugar/table_exists.go

@@ -0,0 +1,30 @@
+package sugar
+
+import (
+	"context"
+	"fmt"
+	"path"
+
+	"github.com/ydb-platform/ydb-go-sdk/v3/scheme"
+)
+
+func IsTableExists(ctx context.Context, c scheme.Client, absTablePath string) (exists bool, _ error) {
+	directory, tableName := path.Split(absTablePath)
+	d, err := c.ListDirectory(ctx, directory)
+	if err != nil {
+		return false, err
+	}
+	for _, e := range d.Children {
+		if e.Name != tableName {
+			continue
+		}
+		if e.Type != scheme.EntryTable {
+			return false, fmt.Errorf(
+				"entry '%s' in path '%s' is not a table: %s",
+				tableName, directory, e.Type.String(),
+			)
+		}
+		return true, nil
+	}
+	return false, nil
+}