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dbt Core v0.21 has reached the end of critical support. No new patch versions will be released, and it will stop running in dbt Cloud on June 30, 2022. Read "About dbt Core versions" for more details.

## Breaking changes​

• dbt source snapshot-freshness has been renamed to dbt source freshness. Its node selection logic is now consistent with other tasks. In order to check freshness for a specific source, you must prefix it with source:.
• Snowflake: Turn off transactions and turn on autocommit by default. Within dbt materializations, wrap DML statements in explicit begin and commit. Note that it is not recommended to run DML statements outside of dbt materialization logic. If you do this, despite our recommendation, you will need to wrap those statements in explicit begin and commit. Note also that this may affect user-space code that depends on transactions, such as pre-hooks and post-hooks that specify transaction: true or transaction: false. We recommend removing those references to transactions.
• Artifacts:

## Selection​

• Commands: source: Updated selection logic to match other tasks. When selecting a specific source to check freshness, you must prefix it with source:.
• Node selection syntax, commands: Switch --models for --select across the board. (Commands which previously used the --models flag still support it for backwards compatibility.)
• YAML selectors now support an optional default property. If set, dbt will use custom selection criteria for commands that do not specify their own selection/exclusion flags.
• Selection methods and state comparison caveats: Add state:modified subselectors, and reflect that it now includes changes to upstream macros.
• Test selection examples includes more discussion of indirect selection (a change in v0.20), and the optional "greedy" flag/property (new in v0.21), which you can optionally set to include tests that have a mix of selected + unselected parents

### Plugins​

• Postgres profile property connect_timeout now configurable. Also applicable to child plugins (e.g. dbt-redshift)
• Redshift: profile property ra3_node: true to support cross-database source definitions and read-only querying
• BigQuery: profile property execution_project now configurable. Snapshots support target_project and target_dataset config aliases.
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