Add archived parquet as int. package (#9912)

Since github.com/minio/parquet-go is archived add it as internal package.

pkg/s3select/internal/parquet-go/encoding/rle-encode.go

@@ -0,0 +1,84 @@
+/*
+ * Minio Cloud Storage, (C) 2019 Minio, 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 encoding
+
+import (
+	"fmt"
+
+	"github.com/minio/minio/pkg/s3select/internal/parquet-go/gen-go/parquet"
+)
+
+func rleEncodeInt32s(i32s []int32, bitWidth int32) (data []byte) {
+	j := 0
+	for i := 0; i < len(i32s); i = j {
+		for j = i + 1; j < len(i32s) && i32s[i] == i32s[j]; j++ {
+		}
+
+		headerBytes := varIntEncode(uint64((j - i) << 1))
+		data = append(data, headerBytes...)
+
+		valBytes := plainEncodeInt32s([]int32{i32s[i]})
+		byteCount := (bitWidth + 7) / 8
+		data = append(data, valBytes[:byteCount]...)
+	}
+
+	return data
+}
+
+func rleEncodeInt64s(i64s []int64, bitWidth int32) (data []byte) {
+	j := 0
+	for i := 0; i < len(i64s); i = j {
+		for j = i + 1; j < len(i64s) && i64s[i] == i64s[j]; j++ {
+		}
+
+		headerBytes := varIntEncode(uint64((j - i) << 1))
+		data = append(data, headerBytes...)
+
+		valBytes := plainEncodeInt64s([]int64{i64s[i]})
+		byteCount := (bitWidth + 7) / 8
+		data = append(data, valBytes[:byteCount]...)
+	}
+
+	return data
+}
+
+// RLEBitPackedHybridEncode encodes values specified in https://github.com/apache/parquet-format/blob/master/Encodings.md#run-length-encoding--bit-packing-hybrid-rle--3
+//
+// Supported Types: INT32, INT64
+func RLEBitPackedHybridEncode(values interface{}, bitWidth int32, parquetType parquet.Type) []byte {
+	var rleBytes []byte
+
+	switch parquetType {
+	case parquet.Type_INT32:
+		i32s, ok := values.([]int32)
+		if !ok {
+			panic(fmt.Errorf("expected slice of int32"))
+		}
+		rleBytes = rleEncodeInt32s(i32s, bitWidth)
+	case parquet.Type_INT64:
+		i64s, ok := values.([]int64)
+		if !ok {
+			panic(fmt.Errorf("expected slice of int64"))
+		}
+		rleBytes = rleEncodeInt64s(i64s, bitWidth)
+	default:
+		panic(fmt.Errorf("%v parquet type unsupported", parquetType))
+	}
+
+	lenBytes := plainEncodeInt32s([]int32{int32(len(rleBytes))})
+	return append(lenBytes, rleBytes...)
+}