(Doc section: Reading Datasets) Generate some data for the rest of this example.
| 49 | // (Doc section: Reading Datasets) |
| 50 | // Generate some data for the rest of this example. |
| 51 | arrow::Result<std::shared_ptr<arrow::Table>> CreateTable() { |
| 52 | auto schema = |
| 53 | arrow::schema({arrow::field("a", arrow::int64()), arrow::field("b", arrow::int64()), |
| 54 | arrow::field("c", arrow::int64())}); |
| 55 | std::shared_ptr<arrow::Array> array_a; |
| 56 | std::shared_ptr<arrow::Array> array_b; |
| 57 | std::shared_ptr<arrow::Array> array_c; |
| 58 | arrow::NumericBuilder<arrow::Int64Type> builder; |
| 59 | ARROW_RETURN_NOT_OK(builder.AppendValues({0, 1, 2, 3, 4, 5, 6, 7, 8, 9})); |
| 60 | ARROW_RETURN_NOT_OK(builder.Finish(&array_a)); |
| 61 | builder.Reset(); |
| 62 | ARROW_RETURN_NOT_OK(builder.AppendValues({9, 8, 7, 6, 5, 4, 3, 2, 1, 0})); |
| 63 | ARROW_RETURN_NOT_OK(builder.Finish(&array_b)); |
| 64 | builder.Reset(); |
| 65 | ARROW_RETURN_NOT_OK(builder.AppendValues({1, 2, 1, 2, 1, 2, 1, 2, 1, 2})); |
| 66 | ARROW_RETURN_NOT_OK(builder.Finish(&array_c)); |
| 67 | return arrow::Table::Make(schema, {array_a, array_b, array_c}); |
| 68 | } |
| 69 | |
| 70 | // Set up a dataset by writing two Parquet files. |
| 71 | arrow::Result<std::string> CreateExampleParquetDataset( |
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