title: “Keys”
Keys
Takes a collection of key-value pairs, and returns the key of each element.
Examples
Example
{{< highlight java >}} PCollection<KV<String, Integer>> keyValuePairs = /* ... */; PCollection keys = keyValuePairs.apply(Keys.create()); {{< /highlight >}}
Related transforms
- KvSwap swaps key-value pair values.
- Values for extracting the value of each element.
- WithKeys for adding a key to each element.