arrow/_examples/helloworld/main.go

// 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.

package main

import (
	"os"

	"github.com/apache/arrow-go/v18/arrow"
	"github.com/apache/arrow-go/v18/arrow/array"
	"github.com/apache/arrow-go/v18/arrow/math"
	"github.com/apache/arrow-go/v18/arrow/memory"
)

func main() {
	schema := arrow.NewSchema([]arrow.Field{
		{Name: "intField", Type: arrow.PrimitiveTypes.Int64, Nullable: false},
		{Name: "stringField", Type: arrow.BinaryTypes.String, Nullable: false},
		{Name: "floatField", Type: arrow.PrimitiveTypes.Float64, Nullable: true},
	}, nil)

	builder := array.NewRecordBuilder(memory.DefaultAllocator, schema)
	defer builder.Release()

	builder.Field(0).(*array.Int64Builder).AppendValues([]int64{1, 2, 3, 4, 5}, nil)
	builder.Field(1).(*array.StringBuilder).AppendValues([]string{"a", "b", "c", "d", "e"}, nil)
	builder.Field(2).(*array.Float64Builder).AppendValues([]float64{1, 0, 3, 0, 5}, []bool{true, false, true, false, true})

	rec := builder.NewRecord()
	defer rec.Release()

	tbl := array.NewTableFromRecords(schema, []arrow.Record{rec})
	defer tbl.Release()

	sum := math.Float64.Sum(tbl.Column(2).Data().Chunk(0).(*array.Float64))
	if sum != 9 {
		defer os.Exit(1)
	}
}