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62 lines
2.3 KiB
Go
62 lines
2.3 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package encoding
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import (
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"github.com/minio/minio/pkg/s3select/internal/parquet-go/common"
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"github.com/minio/minio/pkg/s3select/internal/parquet-go/gen-go/parquet"
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)
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// RLEDictEncode encodes values specified in https://github.com/apache/parquet-format/blob/master/Encodings.md#dictionary-encoding-plain_dictionary--2-and-rle_dictionary--8 and returns dictionary page data and data page data.
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//
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// Dictionary page data contains PLAIN encodeed slice of uniquely fully defined non-nil values.
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// Data page data contains RLE/Bit-Packed Hybrid encoded indices of fully defined non-nil values.
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//
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// Supported Types: BOOLEAN, INT32, INT64, FLOAT, DOUBLE, BYTE_ARRAY
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func RLEDictEncode(values []interface{}, parquetType parquet.Type, bitWidth int32) (dictPageData, dataPageData []byte, dictValueCount int32, indexBitWidth uint8) {
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var definedValues []interface{}
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var indices []int32
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valueIndexMap := make(map[interface{}]int32)
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j := 0
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for i := 0; i < len(values); i = j {
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for j = i; j < len(values); j++ {
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value := values[j]
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if value == nil {
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continue
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}
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index, found := valueIndexMap[value]
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if !found {
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index = int32(len(definedValues))
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definedValues = append(definedValues, value)
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valueIndexMap[value] = index
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}
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indices = append(indices, index)
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}
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}
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indexBitWidth = uint8(common.BitWidth(uint64(indices[len(indices)-1])))
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dictPageData = PlainEncode(common.ToSliceValue(definedValues, parquetType), parquetType)
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dataPageData = RLEBitPackedHybridEncode(indices, int32(indexBitWidth), parquet.Type_INT32)
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return dictPageData, dataPageData, int32(len(definedValues)), indexBitWidth
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}
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