Class Projection

Inheritance Relationships

Base Type

Class Documentation

class ral::batch::Projection : public ral::cache::kernel

This kernel only returns the subset columns contained in the logical projection expression.

Public Functions

Projection(std::size_t kernel_id, const std::string &queryString, std::shared_ptr<Context> context, std::shared_ptr<ral::cache::graph> query_graph)

Constructor for Projection

  • kernel_id: Kernel identifier.

  • queryString: Original logical expression that the kernel will execute.

  • context: Shared context associated to the running query.

  • query_graph: Shared pointer of the current execution graph.

inline virtual std::string kernel_name()
ral::execution::task_result do_process(std::vector<std::unique_ptr<ral::frame::BlazingTable>> inputs, std::shared_ptr<ral::cache::CacheMachine> output, cudaStream_t stream, const std::map<std::string, std::string> &args) override
virtual kstatus run() override

Executes the batch processing. Loads the data from their input port, and after processing it, the results are stored in their output port.


kstatus ‘stop’ to halt processing, or ‘proceed’ to continue processing.