chore: import upstream snapshot with attribution

2026-07-13 12:32:25 +08:00
commit e014feafe1
2285 changed files with 1131979 additions and 0 deletions
@@ -0,0 +1,107 @@
+// Copyright 2024 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package _dataloader
+
+import (
+	"bytes"
+	"io"
+	"testing"
+
+	"github.com/dolthub/doltgresql/core/dataloader"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestStringPrefixReader(t *testing.T) {
+	t.Run("Read prefix and all data in single call", func(t *testing.T) {
+		prefix := "prefix"
+		reader := bytes.NewReader([]byte("0123456789"))
+		prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
+
+		data := make([]byte, 100)
+		bytesRead, err := prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 16, bytesRead)
+		require.Equal(t, "prefix0123456789", string(data[:bytesRead]))
+
+		bytesRead, err = prefixReader.Read(data)
+		require.Equal(t, io.EOF, err)
+		require.Equal(t, 0, bytesRead)
+	})
+
+	t.Run("Read part of prefix", func(t *testing.T) {
+		prefix := "prefix"
+		reader := bytes.NewReader([]byte("0123456789"))
+		prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
+
+		data := make([]byte, 5)
+		bytesRead, err := prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 5, bytesRead)
+		require.Equal(t, "prefi", string(data[:bytesRead]))
+
+		// Read the next 5 bytes
+		bytesRead, err = prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 5, bytesRead)
+		require.Equal(t, "x0123", string(data[:bytesRead]))
+
+		// Read the next 5 bytes
+		bytesRead, err = prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 5, bytesRead)
+		require.Equal(t, "45678", string(data[:bytesRead]))
+
+		// Read the last byte
+		bytesRead, err = prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 1, bytesRead)
+		require.Equal(t, "9", string(data[:bytesRead]))
+
+		// Read EOF
+		bytesRead, err = prefixReader.Read(data)
+		require.Equal(t, io.EOF, err)
+		require.Equal(t, 0, bytesRead)
+	})
+
+	t.Run("Read to prefix boundary", func(t *testing.T) {
+		prefix := "prefix"
+		reader := bytes.NewReader([]byte("0123456789"))
+		prefixReader := dataloader.NewStringPrefixReader(prefix, reader)
+
+		data := make([]byte, 6)
+		bytesRead, err := prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 6, bytesRead)
+		require.Equal(t, "prefix", string(data[:bytesRead]))
+
+		// Read the next 6 bytes
+		bytesRead, err = prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 6, bytesRead)
+		require.Equal(t, "012345", string(data[:bytesRead]))
+
+		// Read the next 6 bytes
+		bytesRead, err = prefixReader.Read(data)
+		require.NoError(t, err)
+		require.Equal(t, 4, bytesRead)
+		require.Equal(t, "6789", string(data[:bytesRead]))
+
+		// Read EOF
+		bytesRead, err = prefixReader.Read(data)
+		require.Equal(t, io.EOF, err)
+		require.Equal(t, 0, bytesRead)
+	})
+}