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| <h2 title="Class HllCount.MergePartial" class="title">Class HllCount.MergePartial</h2> |
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| <dd><a href="../../../../../../org/apache/beam/sdk/extensions/zetasketch/HllCount.html" title="class in org.apache.beam.sdk.extensions.zetasketch">HllCount</a></dd> |
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| <pre>public static final class <span class="typeNameLabel">HllCount.MergePartial</span> |
| extends java.lang.Object</pre> |
| <div class="block">Provides <code>PTransform</code>s to merge HLL++ sketches into a new sketch. |
| |
| <p>Only sketches of the same type can be merged together. If incompatible sketches are |
| provided, a runtime error will occur. |
| |
| <p>If sketches of different <code>precision</code>s are merged, the merged sketch will get the |
| minimum precision encountered among all the input sketches. |
| |
| <p>An "empty sketch" represented by an byte array of length 0 is returned if the input <code>PCollection</code> is empty. |
| |
| <p>Corresponds to the <code>HLL_COUNT.MERGE_PARTIAL(sketch)</code> function in <a |
| href="https://cloud.google.com/bigquery/docs/reference/standard-sql/hll_functions">BigQuery</a>.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.Globally.html" title="class in org.apache.beam.sdk.transforms">Combine.Globally</a><byte[],byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/zetasketch/HllCount.MergePartial.html#globally--">globally</a></span>()</code> |
| <div class="block">Returns a <code>Combine.Globally</code> <code>PTransform</code> that takes an input <code>PCollection<byte[]></code> of HLL++ sketches and returns a <code>PCollection<byte[]></code> of a new |
| sketch merged from the input sketches.</div> |
| </td> |
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| <td class="colFirst"><code>static <K> <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.PerKey.html" title="class in org.apache.beam.sdk.transforms">Combine.PerKey</a><K,byte[],byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/zetasketch/HllCount.MergePartial.html#perKey--">perKey</a></span>()</code> |
| <div class="block">Returns a <code>Combine.PerKey</code> <code>PTransform</code> that takes an input <code>PCollection<KV<K, byte[]>></code> of (key, HLL++ sketch) pairs and returns a <code>PCollection<KV<K, byte[]>></code> of (key, new sketch merged from the input sketches under the |
| key).</div> |
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| <h4>globally</h4> |
| <pre>public static <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.Globally.html" title="class in org.apache.beam.sdk.transforms">Combine.Globally</a><byte[],byte[]> globally()</pre> |
| <div class="block">Returns a <code>Combine.Globally</code> <code>PTransform</code> that takes an input <code>PCollection<byte[]></code> of HLL++ sketches and returns a <code>PCollection<byte[]></code> of a new |
| sketch merged from the input sketches. |
| |
| <p>Only sketches of the same type can be merged together. If incompatible sketches are |
| provided, a runtime error will occur. |
| |
| <p>If sketches of different <code>precision</code>s are merged, the merged sketch will get the |
| minimum precision encountered among all the input sketches. |
| |
| <p>Returns a singleton <code>PCollection</code> with an "empty sketch" (byte array of length 0) if |
| the input <code>PCollection</code> is empty.</div> |
| </li> |
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| <h4>perKey</h4> |
| <pre>public static <K> <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.PerKey.html" title="class in org.apache.beam.sdk.transforms">Combine.PerKey</a><K,byte[],byte[]> perKey()</pre> |
| <div class="block">Returns a <code>Combine.PerKey</code> <code>PTransform</code> that takes an input <code>PCollection<KV<K, byte[]>></code> of (key, HLL++ sketch) pairs and returns a <code>PCollection<KV<K, byte[]>></code> of (key, new sketch merged from the input sketches under the |
| key). |
| |
| <p>If sketches of different <code>precision</code>s are merged, the merged sketch will get the |
| minimum precision encountered among all the input sketches. |
| |
| <p>Only sketches of the same type can be merged together. If incompatible sketches are |
| provided, a runtime error will occur.</div> |
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