本文整理汇总了C++中StoragePtr::getSampleBlock方法的典型用法代码示例。如果您正苦于以下问题：C++ StoragePtr::getSampleBlock方法的具体用法？C++ StoragePtr::getSampleBlock怎么用？C++ StoragePtr::getSampleBlock使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类StoragePtr的用法示例。
在下文中一共展示了StoragePtr::getSampleBlock方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: test1
void test1()
{
Context context;
StoragePtr table = StorageSystemNumbers::create("numbers");
Names column_names;
column_names.push_back("number");
QueryProcessingStage::Enum stage1;
QueryProcessingStage::Enum stage2;
QueryProcessingStage::Enum stage3;
BlockInputStreams streams;
streams.emplace_back(std::make_shared<LimitBlockInputStream>(table->read(column_names, 0, context, Settings(), stage1, 1)[0], 30, 30000));
streams.emplace_back(std::make_shared<LimitBlockInputStream>(table->read(column_names, 0, context, Settings(), stage2, 1)[0], 30, 2000));
streams.emplace_back(std::make_shared<LimitBlockInputStream>(table->read(column_names, 0, context, Settings(), stage3, 1)[0], 30, 100));
UnionBlockInputStream<> union_stream(streams, nullptr, 2);
WriteBufferFromFileDescriptor wb(STDERR_FILENO);
Block sample = table->getSampleBlock();
BlockOutputStreamPtr out = context.getOutputFormat("TabSeparated", wb, sample);
while (Block block = union_stream.read())
{
out->write(block);
wb.next();
}
//copyData(union_stream, *out);
}