vibhatha commented on a change in pull request #12267:
URL: https://github.com/apache/arrow/pull/12267#discussion_r796245719
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File path: cpp/src/arrow/compute/exec/source_node.cc
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@@ -169,12 +172,83 @@ struct SourceNode : ExecNode {
AsyncGenerator<util::optional<ExecBatch>> generator_;
};
+struct TableSourceNode : public SourceNode {
+ TableSourceNode(ExecPlan* plan, std::shared_ptr<Schema> output_schema,
+ std::shared_ptr<Table> table, int64_t batch_size)
+ : SourceNode(plan, output_schema,
+
generator(ConvertTableToExecBatches(*table.get()).ValueOrDie())),
+ batch_size(batch_size) {}
+
+ static Result<ExecNode*> Make(ExecPlan* plan, std::vector<ExecNode*> inputs,
+ const ExecNodeOptions& options) {
+ RETURN_NOT_OK(ValidateExecNodeInputs(plan, inputs, 0, "TableSourceNode"));
+ const auto& table_options = checked_cast<const
TableSourceNodeOptions&>(options);
+ return plan->EmplaceNode<TableSourceNode>(plan,
table_options.table->schema(),
+ table_options.table,
+ table_options.batch_size);
+ }
+ const char* kind_name() const override { return "TableSourceNode"; }
+
+ [[noreturn]] void InputReceived(ExecNode* input, ExecBatch batch) override {
+ SourceNode::InputReceived(input, batch);
+ }
+ [[noreturn]] void ErrorReceived(ExecNode* input, Status status) override {
+ SourceNode::ErrorReceived(input, status);
+ }
+ [[noreturn]] void InputFinished(ExecNode* input, int total_batches) override
{
+ SourceNode::InputFinished(input, total_batches);
+ }
+
+ Status StartProducing() override { return SourceNode::StartProducing(); }
+
+ void PauseProducing(ExecNode* output) override {
SourceNode::PauseProducing(output); }
+
+ void StopProducing() override { SourceNode::StopProducing(); }
+
+ Future<> finished() override { return SourceNode::finished(); }
+
+ arrow::AsyncGenerator<util::optional<ExecBatch>> generator(
+ std::vector<ExecBatch> batches) {
+ auto opt_batches = MapVector(
+ [](ExecBatch batch) { return util::make_optional(std::move(batch)); },
batches);
+ AsyncGenerator<util::optional<ExecBatch>> gen;
+ gen = MakeVectorGenerator(std::move(opt_batches));
+ return gen;
+ }
+
+ arrow::Result<std::vector<ExecBatch>> ConvertTableToExecBatches(const Table&
table) {
+ std::shared_ptr<TableBatchReader> reader =
std::make_shared<TableBatchReader>(table);
+
+ // setting chunksize for the batch reader
+ if (batch_size > 0) {
+ reader->set_chunksize(batch_size);
+ }
+
+ std::shared_ptr<arrow::RecordBatch> batch;
+ std::vector<std::shared_ptr<arrow::RecordBatch>> batch_vector;
Review comment:
no these were supposed to use, but I haven't actually used them for any
thing.
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