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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/internal/bitutils"
"github.com/apache/arrow-go/v18/parquet"
)
// PlainFixedLenByteArrayEncoder writes the raw bytes of the byte array
// always writing typeLength bytes for each value.
type PlainFixedLenByteArrayEncoder struct {
encoder
bitSetReader bitutils.SetBitRunReader
}
// Put writes the provided values to the encoder
func (enc *PlainFixedLenByteArrayEncoder) Put(in []parquet.FixedLenByteArray) {
typeLen := enc.descr.TypeLength()
if typeLen == 0 {
return
}
bytesNeeded := len(in) * typeLen
enc.sink.Reserve(bytesNeeded)
for _, val := range in {
if val == nil {
panic("value cannot be nil")
}
enc.sink.UnsafeWrite(val[:typeLen])
}
}
// PutSpaced is like Put but works with data that is spaced out according to the passed in bitmap
func (enc *PlainFixedLenByteArrayEncoder) PutSpaced(in []parquet.FixedLenByteArray, validBits []byte, validBitsOffset int64) {
if validBits != nil {
if enc.bitSetReader == nil {
enc.bitSetReader = bitutils.NewSetBitRunReader(validBits, validBitsOffset, int64(len(in)))
} else {
enc.bitSetReader.Reset(validBits, validBitsOffset, int64(len(in)))
}
for {
run := enc.bitSetReader.NextRun()
if run.Length == 0 {
break
}
enc.Put(in[int(run.Pos):int(run.Pos+run.Length)])
}
} else {
enc.Put(in)
}
}
// Type returns the underlying physical type this encoder works with, Fixed Length byte arrays.
func (PlainFixedLenByteArrayEncoder) Type() parquet.Type {
return parquet.Types.FixedLenByteArray
}
// ByteStreamSplitFixedLenByteArrayEncoder writes the underlying bytes of the FixedLenByteArray
// into interlaced streams as defined by the BYTE_STREAM_SPLIT encoding
type ByteStreamSplitFixedLenByteArrayEncoder struct {
PlainFixedLenByteArrayEncoder
flushBuffer *PooledBufferWriter
}
func (enc *ByteStreamSplitFixedLenByteArrayEncoder) FlushValues() (Buffer, error) {
in, err := enc.PlainFixedLenByteArrayEncoder.FlushValues()
if err != nil {
return nil, err
}
if enc.flushBuffer == nil {
enc.flushBuffer = NewPooledBufferWriter(in.Len())
}
enc.flushBuffer.buf.ResizeNoShrink(in.Len())
switch enc.typeLen {
case 2:
encodeByteStreamSplitWidth2(enc.flushBuffer.Bytes(), in.Bytes())
case 4:
encodeByteStreamSplitWidth4(enc.flushBuffer.Bytes(), in.Bytes())
case 8:
encodeByteStreamSplitWidth8(enc.flushBuffer.Bytes(), in.Bytes())
default:
encodeByteStreamSplit(enc.flushBuffer.Bytes(), in.Bytes(), enc.typeLen)
}
return enc.flushBuffer.Finish(), nil
}
func (enc *ByteStreamSplitFixedLenByteArrayEncoder) Release() {
enc.PlainFixedLenByteArrayEncoder.Release()
releaseBufferToPool(enc.flushBuffer)
enc.flushBuffer = nil
}
// WriteDict overrides the embedded WriteDict function to call a specialized function
// for copying out the Fixed length values from the dictionary more efficiently.
func (enc *DictFixedLenByteArrayEncoder) WriteDict(out []byte) {
enc.memo.(BinaryMemoTable).CopyFixedWidthValues(0, enc.typeLen, out)
}
// Put writes fixed length values to a dictionary encoded column
func (enc *DictFixedLenByteArrayEncoder) Put(in []parquet.FixedLenByteArray) {
for _, v := range in {
memoIdx, found, err := enc.memo.GetOrInsert(v)
if err != nil {
panic(err)
}
if !found {
enc.dictEncodedSize += enc.typeLen
}
enc.addIndex(memoIdx)
}
}
// PutSpaced is like Put but leaves space for nulls
func (enc *DictFixedLenByteArrayEncoder) PutSpaced(in []parquet.FixedLenByteArray, validBits []byte, validBitsOffset int64) {
bitutils.VisitSetBitRuns(validBits, validBitsOffset, int64(len(in)), func(pos, length int64) error {
enc.Put(in[pos : pos+length])
return nil
})
}
// PutDictionary allows pre-seeding a dictionary encoder with
// a dictionary from an Arrow Array.
//
// The passed in array must not have any nulls and this can only
// be called on an empty encoder.
func (enc *DictFixedLenByteArrayEncoder) PutDictionary(values arrow.Array) error {
if values.DataType().ID() != arrow.FIXED_SIZE_BINARY && values.DataType().ID() != arrow.DECIMAL {
return fmt.Errorf("%w: only fixed size binary and decimal128 arrays are supported", arrow.ErrInvalid)
}
if values.DataType().(arrow.FixedWidthDataType).Bytes() != enc.typeLen {
return fmt.Errorf("%w: size mismatch: %s should have been %d wide",
arrow.ErrInvalid, values.DataType(), enc.typeLen)
}
if err := enc.canPutDictionary(values); err != nil {
return err
}
enc.dictEncodedSize += enc.typeLen * values.Len()
data := values.Data().Buffers()[1].Bytes()[values.Data().Offset()*enc.typeLen:]
for i := 0; i < values.Len(); i++ {
_, _, err := enc.memo.GetOrInsert(data[i*enc.typeLen : (i+1)*enc.typeLen])
if err != nil {
return err
}
}
values.Retain()
enc.preservedDict = values
return nil
}
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