Keys

Javadoc

Takes a collection of key-value pairs, and returns the key of each element.

Examples

Example

PCollection<KV<String, Integer>> keyValuePairs = /* ... */;
PCollection<String> keys = keyValuePairs.apply(Keys.create());

Related transforms

• KvSwap swaps key-value pair values.
• Values for extracting the value of each element.
• WithKeys for adding a key to each element.