felipecrv commented on code in PR #34534: URL: https://github.com/apache/arrow/pull/34534#discussion_r1132909209
########## go/arrow/compute/internal/kernels/vector_run_end_encode.go: ########## @@ -0,0 +1,947 @@ +// 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. + +//go:build go1.18 + +package kernels + +import ( + "bytes" + "fmt" + "sort" + "unsafe" + + "github.com/apache/arrow/go/v12/arrow" + "github.com/apache/arrow/go/v12/arrow/bitutil" + "github.com/apache/arrow/go/v12/arrow/compute/internal/exec" + "github.com/apache/arrow/go/v12/arrow/decimal128" + "github.com/apache/arrow/go/v12/arrow/decimal256" + "github.com/apache/arrow/go/v12/arrow/float16" + "github.com/apache/arrow/go/v12/arrow/internal/debug" + "github.com/apache/arrow/go/v12/arrow/memory" +) + +type RunEndEncodeState struct { + RunEndType arrow.DataType +} + +func (RunEndEncodeState) TypeName() string { + return "RunEndEncodeOptions" +} + +type RunEndsType interface { + int16 | int32 | int64 +} + +func readFixedWidthVal[V exec.FixedWidthTypes](inputValidity, inputValues []byte, offset int64, out *V) bool { + sz := int64(unsafe.Sizeof(*out)) + *out = *(*V)(unsafe.Pointer(&inputValues[offset*sz])) + return bitutil.BitIsSet(inputValidity, int(offset)) +} + +func writeFixedWidthVal[V exec.FixedWidthTypes](result *exec.ExecResult, offset int64, valid bool, value V) { + if len(result.Buffers[0].Buf) != 0 { + bitutil.SetBitTo(result.Buffers[0].Buf, int(offset), valid) + } + + arr := exec.GetData[V](result.Buffers[1].Buf) + arr[offset] = value +} + +func readBoolVal(inputValidity, inputValues []byte, offset int64, out *bool) bool { + *out = bitutil.BitIsSet(inputValues, int(offset)) + return bitutil.BitIsSet(inputValidity, int(offset)) +} + +func writeBoolVal(result *exec.ExecResult, offset int64, valid bool, value bool) { + if len(result.Buffers[0].Buf) != 0 { + bitutil.SetBitTo(result.Buffers[0].Buf, int(offset), valid) + } + bitutil.SetBitTo(result.Buffers[1].Buf, int(offset), value) +} + +type runEndEncodeLoopFixedWidth[R RunEndsType, V exec.FixedWidthTypes | bool] struct { + inputLen, inputOffset int64 + inputValidity []byte + inputValues []byte + valueType arrow.DataType + + readValue func(inputValidity, inputValues []byte, offset int64, out *V) bool + writeValue func(*exec.ExecResult, int64, bool, V) +} + +func (re *runEndEncodeLoopFixedWidth[R, V]) WriteEncodedRuns(out *exec.ExecResult) int64 { + outputRunEnds := exec.GetData[R](out.Children[0].Buffers[1].Buf) + + readOffset := re.inputOffset + var currentRun V + curRunValid := re.readValue(re.inputValidity, re.inputValues, readOffset, ¤tRun) + readOffset++ + + var writeOffset int64 + for readOffset < re.inputOffset+re.inputLen { + var value V + valid := re.readValue(re.inputValidity, re.inputValues, readOffset, &value) + if valid != curRunValid || value != currentRun { + // close the current run by writing it out + re.writeValue(&out.Children[1], writeOffset, curRunValid, currentRun) + runEnd := R(readOffset - re.inputOffset) + outputRunEnds[writeOffset] = runEnd + writeOffset++ + curRunValid, currentRun = valid, value + } + readOffset++ + } + + re.writeValue(&out.Children[1], writeOffset, curRunValid, currentRun) + outputRunEnds[writeOffset] = R(re.inputLen) + return writeOffset + 1 +} + +func (re *runEndEncodeLoopFixedWidth[R, V]) CountNumberOfRuns() (numValid, numOutput int64) { + offset := re.inputOffset + var currentRun V + curRunValid := re.readValue(re.inputValidity, re.inputValues, offset, ¤tRun) + offset++ + + if curRunValid { + numValid = 1 + } + numOutput = 1 + + for offset < re.inputOffset+re.inputLen { + var value V + valid := re.readValue(re.inputValidity, re.inputValues, offset, &value) + offset++ + // new run + if valid != curRunValid || value != currentRun { + currentRun = value + curRunValid = valid + + numOutput++ + if valid { + numValid++ + } + } + } + return +} + +func (re *runEndEncodeLoopFixedWidth[R, V]) PreallocOutput(ctx *exec.KernelCtx, numOutput int64, out *exec.ExecResult) { + runEndsBuffer := ctx.Allocate(int(numOutput) * int(SizeOf[R]())) + var validityBuffer *memory.Buffer + if len(re.inputValidity) > 0 { + validityBuffer = ctx.AllocateBitmap(numOutput) + } + + var valueBuffer *memory.Buffer + bufSpec := re.valueType.Layout().Buffers[1] + if bufSpec.Kind == arrow.KindBitmap { + valueBuffer = ctx.AllocateBitmap(numOutput) + } else { + valueBuffer = ctx.Allocate(int(numOutput) * bufSpec.ByteWidth) + } + + reeType := arrow.RunEndEncodedOf(exec.GetDataType[R](), re.valueType) + out.Release() + + *out = exec.ExecResult{ + Type: reeType, + Len: re.inputLen, + Nulls: 0, + Offset: 0, + Children: []exec.ArraySpan{ + { + Type: reeType.RunEnds(), + Len: numOutput, + }, + { + Type: reeType.Encoded(), + Len: numOutput, + }, + }, + } + + out.Children[0].Buffers[1].WrapBuffer(runEndsBuffer) + if validityBuffer != nil { + out.Children[1].Buffers[0].WrapBuffer(validityBuffer) + } + out.Children[1].Buffers[1].WrapBuffer(valueBuffer) +} + +type runEndEncodeFSB[R RunEndsType] struct { + inputLen, inputOffset int64 + inputValidity, inputValues []byte + valueType arrow.DataType + width int +} + +func (re *runEndEncodeFSB[R]) readValue(idx int64) ([]byte, bool) { + if len(re.inputValidity) > 0 && bitutil.BitIsNotSet(re.inputValidity, int(idx)) { + return nil, false + } + + start, end := idx*int64(re.width), (idx+1)*int64(re.width) + return re.inputValues[start:end], true +} + +func (re *runEndEncodeFSB[R]) CountNumberOfRuns() (numValid, numOutput int64) { + offset := re.inputOffset + currentRun, curRunValid := re.readValue(offset) + offset++ + + if curRunValid { + numValid++ + } + numOutput = 1 + + for offset < re.inputOffset+re.inputLen { + value, valid := re.readValue(offset) + offset++ + if valid != curRunValid || !bytes.Equal(value, currentRun) { + currentRun, curRunValid = value, valid + numOutput++ + if valid { + numValid++ + } + } + } + return +} + +func (re *runEndEncodeFSB[R]) PreallocOutput(ctx *exec.KernelCtx, numOutput int64, out *exec.ExecResult) { + runEndsBuffer := ctx.Allocate(int(numOutput) * int(SizeOf[R]())) + var validityBuffer *memory.Buffer + if len(re.inputValidity) > 0 { + validityBuffer = ctx.AllocateBitmap(numOutput) + } + + valueBuffer := ctx.Allocate(re.width * int(numOutput)) + reeType := arrow.RunEndEncodedOf(exec.GetDataType[R](), re.valueType) + out.Release() + + *out = exec.ExecResult{ + Type: reeType, + Len: re.inputLen, + Nulls: 0, + Offset: 0, + Children: []exec.ArraySpan{ + { + Type: reeType.RunEnds(), + Len: numOutput, + }, + { + Type: reeType.Encoded(), + Len: numOutput, + }, + }, + } + + out.Children[0].Buffers[1].WrapBuffer(runEndsBuffer) + if validityBuffer != nil { + out.Children[1].Buffers[0].WrapBuffer(validityBuffer) + } + out.Children[1].Buffers[1].WrapBuffer(valueBuffer) +} + +func (re *runEndEncodeFSB[R]) WriteEncodedRuns(out *exec.ExecResult) int64 { + outputRunEnds := exec.GetData[R](out.Children[0].Buffers[1].Buf) + outputValues := out.Children[1].Buffers[1].Buf + + readOffset := re.inputOffset + currentRun, curRunValid := re.readValue(readOffset) + readOffset++ + + var writeOffset int64 + validityBuf := out.Children[1].Buffers[0].Buf + setValidity := func(valid bool) {} + if len(validityBuf) > 0 { + setValidity = func(valid bool) { + bitutil.SetBitTo(validityBuf, int(writeOffset), valid) + } + } + + writeValue := func(valid bool, value []byte) { + setValidity(valid) + start := writeOffset * int64(re.width) + copy(outputValues[start:], value) + } + + for readOffset < re.inputOffset+re.inputLen { + value, valid := re.readValue(readOffset) + + if valid != curRunValid || !bytes.Equal(value, currentRun) { + writeValue(curRunValid, currentRun) + runEnd := R(readOffset - re.inputOffset) + outputRunEnds[writeOffset] = runEnd + writeOffset++ + curRunValid, currentRun = valid, value + } + + readOffset++ + } + + writeValue(curRunValid, currentRun) + outputRunEnds[writeOffset] = R(re.inputLen) + return writeOffset + 1 +} + +type runEndEncodeLoopBinary[R RunEndsType, O int32 | int64] struct { + inputLen, inputOffset int64 + inputValidity, inputValues []byte + offsetValues []O + valueType arrow.DataType + + estimatedValuesLen int64 +} + +func (re *runEndEncodeLoopBinary[R, O]) readValue(idx int64) ([]byte, bool) { + if len(re.inputValidity) > 0 && bitutil.BitIsNotSet(re.inputValidity, int(idx)) { + return nil, false + } + + start, end := re.offsetValues[idx], re.offsetValues[idx+1] + return re.inputValues[start:end], true +} + +func (re *runEndEncodeLoopBinary[R, O]) CountNumberOfRuns() (numValid, numOutput int64) { + re.estimatedValuesLen = 0 + + var offset int64 + currentRun, curRunValid := re.readValue(offset) + offset++ + + if curRunValid { + numValid = 1 + re.estimatedValuesLen += int64(len(currentRun)) + } + numOutput = 1 + + for offset < re.inputLen { + value, valid := re.readValue(offset) + offset++ + // new run + if valid != curRunValid || !bytes.Equal(value, currentRun) { + if valid { + re.estimatedValuesLen += int64(len(value)) + } + + currentRun = value + curRunValid = valid + + numOutput++ + if valid { + numValid++ + } + } + } + return +} + +func (re *runEndEncodeLoopBinary[R, O]) PreallocOutput(ctx *exec.KernelCtx, numOutput int64, out *exec.ExecResult) { + runEndsBuffer := ctx.Allocate(int(numOutput) * int(SizeOf[R]())) + var validityBuffer *memory.Buffer + if len(re.inputValidity) > 0 { + validityBuffer = ctx.AllocateBitmap(numOutput) + } + + valueBuffer := ctx.Allocate(int(re.estimatedValuesLen)) + offsetsBuffer := ctx.Allocate(int(numOutput+1) * int(SizeOf[O]())) + + reeType := arrow.RunEndEncodedOf(exec.GetDataType[R](), re.valueType) + *out = exec.ExecResult{ + Type: reeType, + Len: re.inputLen, + Nulls: 0, + Offset: 0, + Children: []exec.ArraySpan{ + { + Type: reeType.RunEnds(), + Len: numOutput, + }, + { + Type: reeType.Encoded(), + Len: numOutput, + }, + }, + } + + out.Children[0].Buffers[1].WrapBuffer(runEndsBuffer) + if validityBuffer != nil { + out.Children[1].Buffers[0].WrapBuffer(validityBuffer) + } + out.Children[1].Buffers[1].WrapBuffer(offsetsBuffer) + out.Children[1].Buffers[2].WrapBuffer(valueBuffer) +} + +func (re *runEndEncodeLoopBinary[R, O]) WriteEncodedRuns(out *exec.ExecResult) int64 { + outputRunEnds := exec.GetData[R](out.Children[0].Buffers[1].Buf) + outputOffsets := exec.GetSpanOffsets[O](&out.Children[1], 1) + outputValues := out.Children[1].Buffers[2].Buf + + var readOffset int64 + currentRun, curRunValid := re.readValue(readOffset) + readOffset++ + + var writeOffset, valueOffset int64 + validityBuf := out.Children[1].Buffers[0].Buf + setValidity := func(valid bool) {} + if len(validityBuf) > 0 { + setValidity = func(valid bool) { + bitutil.SetBitTo(validityBuf, int(writeOffset), valid) + } + } + + outputOffsets[0], outputOffsets = 0, outputOffsets[1:] + + writeValue := func(valid bool, value []byte) { + setValidity(valid) + valueOffset += int64(copy(outputValues[valueOffset:], value)) + outputOffsets[writeOffset] = O(valueOffset) + } + + for readOffset < re.inputLen { Review Comment: `readOffset < re.inputOffset + re.inputLen` Either that or I'm missing something about Binary array types. -- This is an automated message from the Apache Git Service. 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