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/plain-encode.go

@@ -0,0 +1,140 @@
+/*
+ * 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 (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"math"
+
+	"github.com/minio/minio/pkg/s3select/internal/parquet-go/gen-go/parquet"
+)
+
+func plainEncodeBools(bs []bool) []byte {
+	data := make([]byte, (len(bs)+7)/8)
+
+	for i := range bs {
+		if bs[i] {
+			data[i/8] |= 1 << uint(i%8)
+		}
+	}
+
+	return data
+}
+
+func plainEncodeInt32s(i32s []int32) []byte {
+	data := make([]byte, len(i32s)*4)
+
+	for i, i32 := range i32s {
+		binary.LittleEndian.PutUint32(data[i*4:], uint32(i32))
+	}
+
+	return data
+}
+
+func plainEncodeInt64s(i64s []int64) []byte {
+	data := make([]byte, len(i64s)*8)
+
+	for i, i64 := range i64s {
+		binary.LittleEndian.PutUint64(data[i*8:], uint64(i64))
+	}
+
+	return data
+}
+
+func plainEncodeFloat32s(f32s []float32) []byte {
+	data := make([]byte, len(f32s)*4)
+
+	for i, f32 := range f32s {
+		binary.LittleEndian.PutUint32(data[i*4:], math.Float32bits(f32))
+	}
+
+	return data
+}
+
+func plainEncodeFloat64s(f64s []float64) []byte {
+	data := make([]byte, len(f64s)*8)
+
+	for i, f64 := range f64s {
+		binary.LittleEndian.PutUint64(data[i*8:], math.Float64bits(f64))
+	}
+
+	return data
+}
+
+func plainEncodeBytesSlices(bytesSlices [][]byte) []byte {
+	buf := new(bytes.Buffer)
+
+	for _, s := range bytesSlices {
+		if err := binary.Write(buf, binary.LittleEndian, uint32(len(s))); err != nil {
+			panic(err)
+		}
+
+		if _, err := buf.Write(s); err != nil {
+			panic(err)
+		}
+	}
+
+	return buf.Bytes()
+}
+
+// PlainEncode encodes values specified in https://github.com/apache/parquet-format/blob/master/Encodings.md#plain-plain--0
+//
+// Supported Types: BOOLEAN, INT32, INT64, FLOAT, DOUBLE, BYTE_ARRAY
+func PlainEncode(values interface{}, parquetType parquet.Type) []byte {
+	switch parquetType {
+	case parquet.Type_BOOLEAN:
+		bs, ok := values.([]bool)
+		if !ok {
+			panic(fmt.Errorf("expected slice of bool"))
+		}
+		return plainEncodeBools(bs)
+	case parquet.Type_INT32:
+		i32s, ok := values.([]int32)
+		if !ok {
+			panic(fmt.Errorf("expected slice of int32"))
+		}
+		return plainEncodeInt32s(i32s)
+	case parquet.Type_INT64:
+		i64s, ok := values.([]int64)
+		if !ok {
+			panic(fmt.Errorf("expected slice of int64"))
+		}
+		return plainEncodeInt64s(i64s)
+	case parquet.Type_FLOAT:
+		f32s, ok := values.([]float32)
+		if !ok {
+			panic(fmt.Errorf("expected slice of float32"))
+		}
+		return plainEncodeFloat32s(f32s)
+	case parquet.Type_DOUBLE:
+		f64s, ok := values.([]float64)
+		if !ok {
+			panic(fmt.Errorf("expected slice of float64"))
+		}
+		return plainEncodeFloat64s(f64s)
+	case parquet.Type_BYTE_ARRAY:
+		bytesSlices, ok := values.([][]byte)
+		if !ok {
+			panic(fmt.Errorf("expected slice of byte array"))
+		}
+		return plainEncodeBytesSlices(bytesSlices)
+	}
+
+	panic(fmt.Errorf("%v parquet type unsupported", parquetType))
+}