vibhatha commented on a change in pull request #12590: URL: https://github.com/apache/arrow/pull/12590#discussion_r836056283
########## File path: cpp/examples/arrow/aggregate_example.cc ########## @@ -0,0 +1,135 @@ +// 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. + +// This example showcases various ways to work with Datasets. It's +// intended to be paired with the documentation. + +#include <arrow/api.h> +#include <arrow/compute/api.h> +#include <arrow/compute/exec/exec_plan.h> +#include <arrow/compute/exec/expression.h> +#include <arrow/compute/exec/options.h> +#include <arrow/datum.h> +#include <arrow/record_batch.h> +#include <arrow/result.h> +#include <arrow/status.h> +#include <arrow/table.h> +#include <arrow/util/async_generator.h> +#include <arrow/util/future.h> +#include <arrow/util/vector.h> + +#include <cstdlib> +#include <iostream> +#include <memory> + +namespace cp = arrow::compute; + +#define ABORT_ON_FAILURE(expr) \ + do { \ + arrow::Status status_ = (expr); \ + if (!status_.ok()) { \ + std::cerr << status_.message() << std::endl; \ + abort(); \ + } \ + } while (0); + +template <typename TYPE, + typename = typename std::enable_if<arrow::is_number_type<TYPE>::value | + arrow::is_boolean_type<TYPE>::value | + arrow::is_temporal_type<TYPE>::value>::type> +arrow::Result<std::shared_ptr<arrow::Array>> GetArrayDataSample( + const std::vector<typename TYPE::c_type>& values) { + using ARROW_ARRAY_TYPE = typename arrow::TypeTraits<TYPE>::ArrayType; + using ARROW_BUILDER_TYPE = typename arrow::TypeTraits<TYPE>::BuilderType; + ARROW_BUILDER_TYPE builder; + ARROW_RETURN_NOT_OK(builder.Reserve(values.size())); + std::shared_ptr<ARROW_ARRAY_TYPE> array; + ARROW_RETURN_NOT_OK(builder.AppendValues(values)); + ARROW_RETURN_NOT_OK(builder.Finish(&array)); + return array; +} + +arrow::Result<std::shared_ptr<arrow::Table>> GetTable() { + std::shared_ptr<arrow::Table> table; + + auto field_vector = {arrow::field("a", arrow::int64()), + arrow::field("b", arrow::boolean()), + arrow::field("c", arrow::int64())}; + ARROW_ASSIGN_OR_RAISE(auto int_array, + GetArrayDataSample<arrow::Int64Type>({0, 1, 2, 0, 4, 1, 0, 5})); + ARROW_ASSIGN_OR_RAISE(auto bool_array, + GetArrayDataSample<arrow::BooleanType>( + {false, true, false, true, true, false, true, false})); + ARROW_ASSIGN_OR_RAISE(auto data_array, GetArrayDataSample<arrow::Int64Type>( + {10, 11, 12, 10, 11, 11, 10, 15})); + + auto schema = arrow::schema(field_vector); + auto data_vector = {int_array, bool_array, data_array}; + + table = arrow::Table::Make(schema, data_vector, 8); + + return table; +} + +arrow::Status DoAggregate() { + auto maybe_plan = cp::ExecPlan::Make(); + ABORT_ON_FAILURE(maybe_plan.status()); + auto plan = maybe_plan.ValueOrDie(); + cp::ExecContext exec_context(arrow::default_memory_pool(), + ::arrow::internal::GetCpuThreadPool()); + + ARROW_ASSIGN_OR_RAISE(auto table, GetTable()); + + std::cout << "Source Table" << std::endl; + + std::cout << table->ToString() << std::endl; + + std::shared_ptr<arrow::Table> out; + cp::CountOptions options(cp::CountOptions::ONLY_VALID); + auto aggregate_options = cp::AggregateNodeOptions{/*aggregates=*/{{"sum", &options}}, + /*targets=*/{"c"}, + /*names=*/{"count(c)"}, + /*keys=*/{}}; + auto schema = arrow::schema({arrow::field("count(c)", arrow::int64())}); + + ABORT_ON_FAILURE(cp::Declaration::Sequence( + { + {"table_source", cp::TableSourceNodeOptions{table, 2}}, + {"aggregate", aggregate_options}, + {"table_sink", cp::TableSinkNodeOptions{&out, schema}}, + }) + .AddToPlan(plan.get()) + .status()); + + ARROW_RETURN_NOT_OK(plan->StartProducing()); + + std::cout << "Output Table Data : " << std::endl; + std::cout << out->ToString() << std::endl; + + auto future = plan->finished(); + + return future.status(); +} + +int main(int argc, char** argv) { Review comment: Another motivation is to extend this with the UDF integration to aggregations. May be it is too early to include it in this PR. May be we can exclude it for now. What do you think? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
