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From zuyu <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #291: Add "COPY TO" operator for exporting ...
Date Wed, 30 Aug 2017 20:04:17 GMT
Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/291#discussion_r136171013
  
    --- Diff: relational_operators/TableExportOperator.cpp ---
    @@ -0,0 +1,329 @@
    +/**
    + * 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.
    + **/
    +
    +#include "relational_operators/TableExportOperator.hpp"
    +
    +#include <cstdio>
    +#include <exception>
    +#include <string>
    +#include <utility>
    +
    +#include "catalog/CatalogAttribute.hpp"
    +#include "query_execution/QueryContext.hpp"
    +#include "query_execution/WorkOrderProtosContainer.hpp"
    +#include "query_execution/WorkOrdersContainer.hpp"
    +#include "relational_operators/WorkOrder.pb.h"
    +#include "storage/StorageBlockInfo.hpp"
    +#include "storage/ValueAccessor.hpp"
    +#include "threading/SpinMutex.hpp"
    +#include "types/TypedValue.hpp"
    +#include "types/containers/Tuple.hpp"
    +#include "utility/BulkIOConfiguration.hpp"
    +#include "utility/StringUtil.hpp"
    +
    +#include "glog/logging.h"
    +
    +#include "tmb/id_typedefs.h"
    +
    +namespace quickstep {
    +
    +bool TableExportOperator::getAllWorkOrders(
    +    WorkOrdersContainer *container,
    +    QueryContext *query_context,
    +    StorageManager *storage_manager,
    +    const tmb::client_id scheduler_client_id,
    +    tmb::MessageBus *bus) {
    +  const auto add_work_order = [&](const block_id input_block_id,
    +                                  const bool is_first_work_order) -> void {
    +    std::unique_ptr<std::string> output_buffer = std::make_unique<std::string>();
    +    container->addNormalWorkOrder(
    +        new TableExportToStringWorkOrder(query_id_,
    +                                         input_relation_,
    +                                         input_block_id,
    +                                         options_->getFormat(),
    +                                         is_first_work_order && options_->hasHeader(),
    +                                         options_->getDelimiter(),
    +                                         options_->escapeStrings(),
    +                                         options_->getQuoteCharacter(),
    +                                         options_->getNullString(),
    +                                         output_buffer.get(),
    +                                         op_index_,
    +                                         scheduler_client_id,
    +                                         storage_manager,
    +                                         bus),
    +        op_index_);
    +
    +    SpinMutexLock lock(output_buffers_mutex_);
    +    output_buffers_.emplace(input_block_id, output_buffer.release());
    +  };
    +
    +  if (input_relation_is_stored_) {
    +    if (!started_) {
    +      for (std::size_t i = 0; i < input_relation_block_ids_.size(); ++i) {
    +        add_work_order(input_relation_block_ids_[i], i == 0);
    +      }
    +      num_workorders_generated_ = input_relation_block_ids_.size();
    +      started_ = true;
    +    }
    +    return true;
    +  } else {
    +    while (num_workorders_generated_ < input_relation_block_ids_.size()) {
    +      add_work_order(input_relation_block_ids_[num_workorders_generated_],
    +                     num_workorders_generated_ == 0);
    +      ++num_workorders_generated_;
    +    }
    +    return done_feeding_input_relation_;
    +  }
    +}
    +
    +bool TableExportOperator::getAllWorkOrderProtos(
    +    WorkOrderProtosContainer *container) {
    +  // TODO(quickstep-team): Implement TextExportOperator for the distributed case.
    +  LOG(FATAL) << "TableExportOperator::getAllWorkOrderProtos() is not supported";
    +}
    +
    +void TableExportOperator::receiveFeedbackMessage(
    +    const WorkOrder::FeedbackMessage &msg) {
    +  DCHECK(TableExportOperator::kBlockOutputMessage == msg.type());
    +  DCHECK(msg.payload_size() == sizeof(block_id));
    +
    +  if (file_ == nullptr) {
    +    const std::string lo_file_name = ToLower(file_name_);
    +    if (lo_file_name == "$stdout") {
    +      file_ = stdout;
    +    } else if (lo_file_name == "$stderr") {
    +      file_ = stderr;
    +    } else {
    +      file_ = std::fopen(file_name_.substr(1).c_str(), "wb");
    +      // TODO(quickstep-team): Decent handling of exceptions at query runtime.
    +      if (file_ == nullptr) {
    +        throw std::runtime_error("Can not open file " + file_name_ + " for writing");
    +      }
    +    }
    +  }
    +
    +  // Mark block done.
    +  const block_id done_block_id = *static_cast<const block_id*>(msg.payload());
    +  {
    +    SpinMutexLock lock(output_buffers_mutex_);
    +    DCHECK(output_buffers_.find(done_block_id) != output_buffers_.end());
    +    output_buffers_.at(done_block_id).done = true;
    +  }
    +
    +  // FIXME(jianqiao): Use work orders to perform the "write to file" operation
    +  // instead of doing it here inside this thread -- as it may stall the scheduler.
    +  while (num_blocks_written_ < num_workorders_generated_) {
    +    // Write block exported strings to file in the same order as the blocks are
    +    // in \p input_relation_block_ids_.
    +    block_id next_block_id;
    +    {
    +      SpinMutexLock lock(block_ids_mutex_);
    +      next_block_id = input_relation_block_ids_[num_blocks_written_];
    +    }
    +    std::unique_ptr<std::string> output_buffer;
    +    {
    +      SpinMutexLock lock(output_buffers_mutex_);
    +      auto it = output_buffers_.find(next_block_id);
    +      if (it == output_buffers_.end() || !it->second.done) {
    +        break;
    +      }
    +      output_buffer = std::move(it->second.buffer);
    +      output_buffers_.erase(it);
    +    }
    +    std::fwrite(output_buffer->c_str(), 1, output_buffer->length(), file_);
    +    ++num_blocks_written_;
    +  }
    +}
    +
    +void TableExportOperator::updateCatalogOnCompletion() {
    +  if (file_ != nullptr && file_ != stdout && file_ != stderr) {
    +    std::fclose(file_);
    +  }
    +  file_ = nullptr;
    +}
    +
    +void TableExportToStringWorkOrder::execute() {
    +  BlockReference block(
    +      storage_manager_->getBlock(input_block_id_, input_relation_));
    +  std::unique_ptr<ValueAccessor> accessor(
    +      block->getTupleStorageSubBlock().createValueAccessor());
    +
    +  switch (format_) {
    +    case BulkIOFormat::kCSV:
    +      writeToString<&TableExportToStringWorkOrder::quoteCSVField>(
    +          accessor.get(), output_buffer_);
    +      break;
    +    case BulkIOFormat::kText:
    +      writeToString<&TableExportToStringWorkOrder::escapeTextField>(
    +          accessor.get(), output_buffer_);
    +      break;
    +    default:
    +      LOG(FATAL) << "Unsupported export format in TableExportWorkOrder::execute()";
    +  }
    +
    +  // Send completion message to operator.
    +  FeedbackMessage msg(TableExportOperator::kBlockOutputMessage,
    +                      getQueryID(),
    +                      operator_index_,
    +                      new block_id(input_block_id_),
    +                      sizeof(input_block_id_));
    +  SendFeedbackMessage(
    +      bus_, ClientIDMap::Instance()->getValue(), scheduler_client_id_, msg);
    +}
    +
    +inline std::string TableExportToStringWorkOrder::quoteCSVField(std::string &&field)
const {
    +  bool need_quote = false;
    +  for (const char c : field) {
    +    if (c == field_terminator_ || c == quote_character_ || c == '\n') {
    --- End diff --
    
    Use `QUICKSTEP_EQUALS_ANY_CONSTANT(c, field_terminator_, quote_character_, '\n')` instead.


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