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APPROX_COUNT_DISTINCT_ESTIMATE

Warning

SingleStore 9.0 gives you the opportunity to preview, evaluate, and provide feedback on new and upcoming features prior to their general availability. In the interim, SingleStore 8.9 is recommended for production workloads, which can later be upgraded to SingleStore 9.0.

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Returns an estimate of the number of distinct values for one or more HyperLogLog states.

Syntax

APPROX_COUNT_DISTINCT_ESTIMATE ( expr )

Arguments

expr

An expression evaluating to a scalar value of type VARBINARY(16384). This scalar value is the HyperLogLog state for which APPROX_COUNT_DISTINCT_ESTIMATE returns the number of distinct values.

expr may be the name of a column. In this case, APPROX_COUNT_DISTINCT_ESTIMATE combines values in the column (which are HyperLogLog states) and returns the number of distinct values in the combined state.

Remarks

This function is used in conjunction with APPROX_COUNT_DISTINCT_ACCUMULATE and APPROX_COUNT_DISTINCT_COMBINE. To best understand its usage, see the topic Distinct Count Estimation Functions.

Last modified: February 24, 2023

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Verification instructions

Note: You must install cosign to verify the authenticity of the SingleStore file.

Use the following steps to verify the authenticity of singlestoredb-server, singlestoredb-toolbox, singlestoredb-studio, and singlestore-client SingleStore files that have been downloaded.

You may perform the following steps on any computer that can run cosign, such as the main deployment host of the cluster.

  1. (Optional) Run the following command to view the associated signature files.

    curl undefined

  2. Download the signature file from the SingleStore release server.

    • Option 1: Click the Download Signature button next to the SingleStore file.

    • Option 2: Copy and paste the following URL into the address bar of your browser and save the signature file.

    • Option 3: Run the following command to download the signature file.

      curl -O undefined

  3. After the signature file has been downloaded, run the following command to verify the authenticity of the SingleStore file.

    echo -n undefined |
        cosign verify-blob --certificate-oidc-issuer https://oidc.eks.us-east-1.amazonaws.com/id/CCDCDBA1379A5596AB5B2E46DCA385BC \
          --certificate-identity https://kubernetes.io/namespaces/freya-production/serviceaccounts/job-worker \
          --bundle undefined \
          --new-bundle-format -
    Verified OK