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title: “Max”

Max

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Gets the element with the maximum value within each aggregation.

Examples

In the following example, we create a pipeline with a PCollection. Then, we get the element with the maximum value in different ways.

Example 1: Maximum element in a PCollection

We use Combine.Globally() to get the maximum element from the entire PCollection.

{{< highlight py >}} {{< code_sample “sdks/python/apache_beam/examples/snippets/transforms/aggregation/max.py” max_globally >}} {{< /highlight >}}

{{< paragraph class=“notebook-skip” >}} Output: {{< /paragraph >}}

{{< highlight class=“notebook-skip” >}} {{< code_sample “sdks/python/apache_beam/examples/snippets/transforms/aggregation/max_test.py” max_element >}} {{< /highlight >}}

{{< buttons-code-snippet py=“sdks/python/apache_beam/examples/snippets/transforms/aggregation/max.py” >}}

Example 2: Maximum elements for each key

We use Combine.PerKey() to get the maximum element for each unique key in a PCollection of key-values.

{{< highlight py >}} {{< code_sample “sdks/python/apache_beam/examples/snippets/transforms/aggregation/max.py” max_per_key >}} {{< /highlight >}}

{{< paragraph class=“notebook-skip” >}} Output: {{< /paragraph >}}

{{< highlight class=“notebook-skip” >}} {{< code_sample “sdks/python/apache_beam/examples/snippets/transforms/aggregation/max_test.py” elements_with_max_value_per_key >}} {{< /highlight >}}

{{< buttons-code-snippet py=“sdks/python/apache_beam/examples/snippets/transforms/aggregation/max.py” >}}

Related transforms

• CombineGlobally
• CombinePerKey
• Mean
• Min
• Sum

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