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main.go
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main.go
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// 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.
// beam-playground:
// name: flatten
// description: Flatten example.
// multifile: false
// context_line: 37
// categories:
// - Quickstart
// complexity: MEDIUM
// tags:
// - hellobeam
package main
import (
"context"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/debug"
)
func main() {
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
// List of elements start with a
aWords := beam.Create(s, "apple", "ant", "arrow")
// List of elements start with b
bWords := beam.Create(s, "ball", "book", "bow")
// The applyTransform() converts [aWords] and [bWords] to [output]
output := applyTransform(s, aWords, bWords)
debug.Print(s, output)
err := beamx.Run(ctx, p)
if err != nil {
log.Exitf(context.Background(), "Failed to execute job: %v", err)
}
}
// The applyTransform two PCollection data types are the same combines and returns one PCollection
func applyTransform(s beam.Scope, aInputs beam.PCollection, bInputs beam.PCollection) beam.PCollection {
return beam.Flatten(s, aInputs, bInputs)
}