Query Execution

Improved Workload Management implementation that no longer needs to be tuned via the workload_management_expected_aggregators engine variable; this variable is now deprecated.
Support for multi-statement transactions that use distributed joins.
Support for multi-statement transactions that write to a database and then read from a different database.
Added a session variable node_degree_of_parallelism that specifies the number of threads per node to use for columnstore table scans.
Queries that use the IN filter on shard keys now perform better.
Hash joins that use reference tables now perform better.
The data_conversion_compatibility_level engine variable can now be set to 7.0. This allows errors to be thrown for more invalid type conversions, instead of doing implicit type conversions, where the user could see unexpected results.
Now, a maximum of 1024 tables can be written to in a transaction.

Last modified: April 24, 2021

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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.

(Optional) Run the following command to view the associated signature files.
Shell
```
curl undefined
```
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.
  Shell
```
curl -O undefined
```

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

Shell

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