github.com/siglens/siglens@v0.0.0-20240328180423-f7ce9ae441ed/pkg/segment/writer/columnencoding.go

/*
Copyright 2023.

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 writer

import (
	segutils "github.com/siglens/siglens/pkg/segment/utils"
	"github.com/siglens/siglens/pkg/utils"
	log "github.com/sirupsen/logrus"
)

func EncodeDictionaryColumn(columnValueMap map[segutils.CValueDictEnclosure][]uint16, colRis map[string]*RangeIndex, recNum uint16) ([]byte, uint32) {
	columnValueSummary := make([]byte, segutils.WIP_SIZE)
	var idx uint32 = 0

	noOfColumnValues := uint16(len(columnValueMap))
	copy(columnValueSummary[idx:], utils.Uint16ToBytesLittleEndian(noOfColumnValues))
	idx += 2

	for key, val := range columnValueMap {
		switch key.Dtype {
		case segutils.SS_DT_STRING:
			columnValueSummary[idx] = byte(segutils.SS_DT_STRING)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}
			n := uint16(len(colValue.(string)))

			copy(columnValueSummary[idx:], utils.Uint16ToBytesLittleEndian(n))
			idx += 2

			copy(columnValueSummary[idx:], colValue.(string))
			idx += uint32(n)

		case segutils.SS_DT_BOOL:
			columnValueSummary[idx] = byte(segutils.SS_DT_BOOL)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.BoolToBytesLittleEndian(colValue.(bool)))
			idx += 1

		case segutils.SS_DT_UNSIGNED_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_UNSIGNED_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Uint64ToBytesLittleEndian(colValue.(uint64)))
			idx += 8

		case segutils.SS_DT_SIGNED_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Int64ToBytesLittleEndian(colValue.(int64)))
			idx += 8

		case segutils.SS_DT_FLOAT:
			columnValueSummary[idx] = byte(segutils.SS_DT_FLOAT)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Float64ToBytesLittleEndian(colValue.(float64)))
			idx += 8
		case segutils.SS_DT_USIGNED_32_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_USIGNED_32_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Uint32ToBytesLittleEndian(colValue.(uint32)))
			idx += 4
		case segutils.SS_DT_SIGNED_32_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_32_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Int32ToBytesLittleEndian(colValue.(int32)))
			idx += 4
		case segutils.SS_DT_USIGNED_16_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_32_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Uint16ToBytesLittleEndian(colValue.(uint16)))
			idx += 2
		case segutils.SS_DT_SIGNED_16_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_32_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], utils.Int16ToBytesLittleEndian(colValue.(int16)))
			idx += 2
		case segutils.SS_DT_USIGNED_8_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_8_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], []byte{colValue.(uint8)})
			idx += 1
		case segutils.SS_DT_SIGNED_8_NUM:
			columnValueSummary[idx] = byte(segutils.SS_DT_SIGNED_8_NUM)
			idx += 1
			colValue, err := key.GetValue()
			if err != nil {
				log.Errorf("EncodeDictionaryColumn: Failed to get value of %v; err: %v", key, err)
				continue
			}

			copy(columnValueSummary[idx:], []byte{byte(colValue.(int8))})
			idx += 1
		}
		copy(columnValueSummary[idx:], utils.Uint16ToBytesLittleEndian(uint16(len(val))))
		idx += 2

		for _, value := range val {
			copy(columnValueSummary[idx:], utils.Uint16ToBytesLittleEndian(value))
			idx += 2
		}
	}

	compressed := encoder.EncodeAll(columnValueSummary[0:idx], make([]byte, 0, idx))
	return compressed, idx
}

func DecodeDictionaryColumn(encodedBytes []byte) map[segutils.CValueDictEnclosure][]uint16 {

	encodedBytes, err := decoder.DecodeAll(encodedBytes, make([]byte, 0, len(encodedBytes)))

	if err != nil {
		log.Errorf("DecodeDictionaryColumn: Failed to decompress, error: %+v", err)
	}

	columnValueMap := make(map[segutils.CValueDictEnclosure][]uint16)
	var idx uint32 = 0

	noOfColumnValues := utils.BytesToUint16LittleEndian(encodedBytes[0:2])
	idx += 2

	for noOfColumnValues > 0 {
		var colCVEnclosure segutils.CValueDictEnclosure
		colCVEnclosure.Dtype = segutils.SS_DTYPE(encodedBytes[idx])
		idx += 1
		switch colCVEnclosure.Dtype {
		case segutils.SS_DT_STRING:
			strLen := uint32(utils.BytesToUint16LittleEndian(encodedBytes[idx:(idx + 2)]))
			idx += 2
			colCVEnclosure.CValString = string(encodedBytes[idx:(idx + strLen)])
			idx += strLen
		case segutils.SS_DT_BOOL:
			colCVEnclosure.CValBool = utils.BytesToBoolLittleEndian([]byte{encodedBytes[idx]})
			idx += 1
		case segutils.SS_DT_UNSIGNED_NUM:
			colCVEnclosure.CValUInt64 = utils.BytesToUint64LittleEndian(encodedBytes[idx:(idx + 8)])
			idx += 8
		case segutils.SS_DT_SIGNED_NUM:
			colCVEnclosure.CValInt64 = utils.BytesToInt64LittleEndian(encodedBytes[idx:(idx + 8)])
			idx += 8
		case segutils.SS_DT_FLOAT:
			colCVEnclosure.CValFloat64 = utils.BytesToFloat64LittleEndian(encodedBytes[idx:(idx + 8)])
			idx += 8
		case segutils.SS_DT_USIGNED_32_NUM:
			colCVEnclosure.CValUInt32 = utils.BytesToUint32LittleEndian(encodedBytes[idx:(idx + 4)])
			idx += 4
		case segutils.SS_DT_SIGNED_32_NUM:
			colCVEnclosure.CValInt32 = utils.BytesToInt32LittleEndian(encodedBytes[idx:(idx + 4)])
			idx += 4
		case segutils.SS_DT_USIGNED_16_NUM:
			colCVEnclosure.CValUInt16 = utils.BytesToUint16LittleEndian(encodedBytes[idx:(idx + 2)])
			idx += 2
		case segutils.SS_DT_SIGNED_16_NUM:
			colCVEnclosure.CValInt16 = utils.BytesToInt16LittleEndian(encodedBytes[idx:(idx + 2)])
			idx += 2
		case segutils.SS_DT_USIGNED_8_NUM:
			colCVEnclosure.CValUInt = encodedBytes[idx+1]
			idx += 1
		case segutils.SS_DT_SIGNED_8_NUM:
			colCVEnclosure.CValInt = int8(encodedBytes[idx+1])
			idx += 1
		}

		valuesLen := utils.BytesToUint16LittleEndian(encodedBytes[idx:(idx + 2)])
		idx += 2

		valSlice := make([]uint16, valuesLen)
		for id := 0; valuesLen > 0; id++ {
			valSlice[id] = utils.BytesToUint16LittleEndian(encodedBytes[idx:(idx + 2)])
			idx += 2
			valuesLen -= 1
		}

		columnValueMap[colCVEnclosure] = valSlice
		noOfColumnValues -= 1
	}

	return columnValueMap
}