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apacheGH-34858: [Swift] Initial reader impl (apache#34842)
- Initial check in for the swift arrow reader impl - bug fixes found during reader testing - class/method access modifier changes (mostly from internal to public) * Closes: apache#34858 Authored-by: Alva Bandy <abandy@live.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>
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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. | ||
|
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| FROM swift:5.7.3 | ||
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| # Install golang | ||
| RUN apt-get update -y -q && \ | ||
| apt-get install -y -q --no-install-recommends \ | ||
| golang-go && \ | ||
| apt-get clean |
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| Original file line number | Diff line number | Diff line change |
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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. | ||
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| import FlatBuffers | ||
| import Foundation | ||
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| public enum ArrowError: Error { | ||
| case runtimeError(String) | ||
| } | ||
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| let FILEMARKER = "ARROW1" | ||
| let CONTINUATIONMARKER = -1 | ||
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| public class ArrowReader { | ||
| private struct DataLoadInfo { | ||
| let recordBatch: org_apache_arrow_flatbuf_RecordBatch | ||
| let field: org_apache_arrow_flatbuf_Field | ||
| let nodeIndex: Int32 | ||
| let bufferIndex: Int32 | ||
| let fileData: Data | ||
| let messageOffset: Int64 | ||
| } | ||
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| private func loadSchema(_ schema: org_apache_arrow_flatbuf_Schema) throws -> ArrowSchema { | ||
| let builder = ArrowSchema.Builder() | ||
| for index in 0 ..< schema.fieldsCount { | ||
| let field = schema.fields(at: index)! | ||
| let arrowField = ArrowField(field.name!, type: findArrowType(field), isNullable: field.nullable) | ||
| builder.addField(arrowField) | ||
| if field.typeType == .struct_ { | ||
| throw ValidationError.unknownType | ||
| } | ||
| } | ||
|
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| return builder.finish() | ||
| } | ||
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| private func loadPrimitiveData(_ loadInfo: DataLoadInfo) throws -> ChunkedArrayHolder { | ||
| let node = loadInfo.recordBatch.nodes(at: loadInfo.nodeIndex)! | ||
| try validateBufferIndex(loadInfo.recordBatch, index: loadInfo.bufferIndex) | ||
| let nullBuffer = loadInfo.recordBatch.buffers(at: loadInfo.bufferIndex)! | ||
| let arrowNullBuffer = makeBuffer(nullBuffer, fileData: loadInfo.fileData, | ||
| length: UInt(node.nullCount), messageOffset: loadInfo.messageOffset) | ||
| try validateBufferIndex(loadInfo.recordBatch, index: loadInfo.bufferIndex + 1) | ||
| let valueBuffer = loadInfo.recordBatch.buffers(at: loadInfo.bufferIndex + 1)! | ||
| let arrowValueBuffer = makeBuffer(valueBuffer, fileData: loadInfo.fileData, | ||
| length: UInt(node.length), messageOffset: loadInfo.messageOffset) | ||
| return try makeArrayHolder(loadInfo.field, buffers: [arrowNullBuffer, arrowValueBuffer]) | ||
| } | ||
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| private func loadVariableData(_ loadInfo: DataLoadInfo) throws -> ChunkedArrayHolder { | ||
| let node = loadInfo.recordBatch.nodes(at: loadInfo.nodeIndex)! | ||
| try validateBufferIndex(loadInfo.recordBatch, index: loadInfo.bufferIndex) | ||
| let nullBuffer = loadInfo.recordBatch.buffers(at: loadInfo.bufferIndex)! | ||
| let arrowNullBuffer = makeBuffer(nullBuffer, fileData: loadInfo.fileData, | ||
| length: UInt(node.nullCount), messageOffset: loadInfo.messageOffset) | ||
| try validateBufferIndex(loadInfo.recordBatch, index: loadInfo.bufferIndex + 1) | ||
| let offsetBuffer = loadInfo.recordBatch.buffers(at: loadInfo.bufferIndex + 1)! | ||
| let arrowOffsetBuffer = makeBuffer(offsetBuffer, fileData: loadInfo.fileData, | ||
| length: UInt(node.length), messageOffset: loadInfo.messageOffset) | ||
| try validateBufferIndex(loadInfo.recordBatch, index: loadInfo.bufferIndex + 2) | ||
| let valueBuffer = loadInfo.recordBatch.buffers(at: loadInfo.bufferIndex + 2)! | ||
| let arrowValueBuffer = makeBuffer(valueBuffer, fileData: loadInfo.fileData, | ||
| length: UInt(node.length), messageOffset: loadInfo.messageOffset) | ||
| return try makeArrayHolder(loadInfo.field, buffers: [arrowNullBuffer, arrowOffsetBuffer, arrowValueBuffer]) | ||
| } | ||
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| private func loadRecordBatch(_ message: org_apache_arrow_flatbuf_Message, schema: org_apache_arrow_flatbuf_Schema, | ||
| data: Data, messageEndOffset: Int64) throws -> RecordBatch { | ||
| let recordBatch = message.header(type: org_apache_arrow_flatbuf_RecordBatch.self) | ||
| let nodesCount = recordBatch?.nodesCount ?? 0 | ||
| var bufferIndex: Int32 = 0 | ||
| var columns: [ChunkedArrayHolder] = [] | ||
| let arrowSchema = try loadSchema(schema) | ||
| for nodeIndex in 0 ..< nodesCount { | ||
| let field = schema.fields(at: nodeIndex)! | ||
| let loadInfo = DataLoadInfo(recordBatch: recordBatch!, field: field, | ||
| nodeIndex: nodeIndex, bufferIndex: bufferIndex, | ||
| fileData: data, messageOffset: messageEndOffset) | ||
| if isFixedPrimitive(field.typeType) { | ||
| let holder = try loadPrimitiveData(loadInfo) | ||
| columns.append(holder) | ||
| bufferIndex += 2 | ||
| } else { | ||
| let holder = try loadVariableData(loadInfo) | ||
| columns.append(holder) | ||
| bufferIndex += 3 | ||
| } | ||
| } | ||
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| return RecordBatch(arrowSchema, columns: columns) | ||
| } | ||
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| public func fromStream(_ fileData: Data) throws -> [RecordBatch] { | ||
| let footerLength = fileData.withUnsafeBytes { rawBuffer in | ||
| rawBuffer.loadUnaligned(fromByteOffset: fileData.count - 4, as: Int32.self) | ||
| } | ||
|
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| var recordBatchs: [RecordBatch] = [] | ||
| let footerStartOffset = fileData.count - Int(footerLength + 4) | ||
| let footerData = fileData[footerStartOffset...] | ||
| let footerBuffer = ByteBuffer(data: footerData) | ||
| let footer = org_apache_arrow_flatbuf_Footer.getRootAsFooter(bb: footerBuffer) | ||
| for index in 0 ..< footer.recordBatchesCount { | ||
| let recordBatch = footer.recordBatches(at: index)! | ||
| var messageLength = fileData.withUnsafeBytes { rawBuffer in | ||
| rawBuffer.loadUnaligned(fromByteOffset: Int(recordBatch.offset), as: Int32.self) | ||
| } | ||
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| var messageOffset: Int64 = 1 | ||
| if messageLength == CONTINUATIONMARKER { | ||
| messageOffset += 1 | ||
| messageLength = fileData.withUnsafeBytes { rawBuffer in | ||
| rawBuffer.loadUnaligned( | ||
| fromByteOffset: Int(recordBatch.offset + Int64(MemoryLayout<Int32>.size)), | ||
| as: Int32.self) | ||
| } | ||
| } | ||
|
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| let messageStartOffset = recordBatch.offset + (Int64(MemoryLayout<Int32>.size) * messageOffset) | ||
| let messageEndOffset = messageStartOffset + Int64(messageLength) | ||
| let recordBatchData = fileData[messageStartOffset ... messageEndOffset] | ||
| let mbb = ByteBuffer(data: recordBatchData) | ||
| let message = org_apache_arrow_flatbuf_Message.getRootAsMessage(bb: mbb) | ||
| switch message.headerType { | ||
| case .recordbatch: | ||
| let recordBatch = try loadRecordBatch(message, schema: footer.schema!, | ||
| data: fileData, messageEndOffset: messageEndOffset) | ||
| recordBatchs.append(recordBatch) | ||
| default: | ||
| print("Unhandled header type: \(message.headerType)") | ||
| } | ||
| } | ||
|
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| return recordBatchs | ||
| } | ||
|
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| public func fromFile(_ fileURL: URL) throws -> [RecordBatch] { | ||
| let fileData = try Data(contentsOf: fileURL) | ||
| if !validateFileData(fileData) { | ||
| throw ArrowError.runtimeError("Not a valid arrow file.") | ||
| } | ||
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| let markerLength = FILEMARKER.utf8.count | ||
| let footerLengthEnd = Int(fileData.count - markerLength) | ||
| let data = fileData[..<(footerLengthEnd)] | ||
| return try fromStream(data) | ||
| } | ||
| } |
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