feat(snowflake) Add COPY TAGS support mirroring COPY GRANTS behavior - #1858
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colin-k-rogers merged 4 commits intoMay 8, 2026
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Snowflake's new COPY TAGS parameter (GA as of Apr 2, 2026) retains tags from a replaced table and its columns during CREATE OR REPLACE TABLE. This adds identical support to COPY GRANTS across all applicable macros.
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Pull request overview
Adds Snowflake adapter support for Snowflake’s COPY TAGS clause, modeled after existing copy_grants behavior, and verifies behavior via unit + functional tests.
Changes:
- Introduces
copy_tagsas an adapter config field (SnowflakeConfig) and wires it into DDL generation. - Emits
copy tagsinCREATE OR REPLACE TABLE(regular + built-in Iceberg) andCREATE OR REPLACE … CLONEwhen enabled. - Adds unit/functional tests plus an unreleased changelog entry for the feature.
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Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.
Show a summary per file
| File | Description |
|---|---|
| dbt-snowflake/src/dbt/adapters/snowflake/impl.py | Adds copy_tags to SnowflakeConfig so the config is recognized/typed by the adapter. |
| dbt-snowflake/src/dbt/include/snowflake/macros/relations/table/create.sql | Adds conditional copy tags emission for regular and built-in Iceberg create/replace table SQL. |
| dbt-snowflake/src/dbt/include/snowflake/macros/materializations/clone.sql | Adds conditional copy tags emission for clone DDL. |
| dbt-snowflake/tests/unit/test_copy_tags.py | Unit tests around SnowflakeConfig.copy_tags defaults and independence from copy_grants. |
| dbt-snowflake/tests/functional/adapter/test_copy_tags.py | Functional tests asserting compiled SQL includes/excludes copy tags appropriately. |
| dbt-snowflake/.changes/unreleased/Features-20260413-120000.yaml | Unreleased changelog entry describing the new capability. |
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Summary
copy_tagsconfig option (boolean, defaultfalse) mirroringcopy_grantsCREATE OR REPLACE TABLECREATE OR REPLACEsupport)Resolves #1857
Changes
impl.py—copy_tags: Optional[bool] = NoneinSnowflakeConfigtable/create.sql—COPY TAGSclause insnowflake__create_table_info_schema_sqlandsnowflake__create_table_built_in_sqlclone.sql—COPY TAGSclause insnowflake__create_or_replace_clonetests/unit/test_copy_tags.py— Unit tests for config field validationtests/functional/adapter/test_copy_tags.py— Functional tests verifying DDL outputTest plan
pytest tests/unit/test_copy_tags.pypytest tests/functional/adapter/test_copy_tags.py.test_extra_configtests still pass (no regressions)copy_tagsappears in compiled SQL when enabledcopy_tagsdoes NOT appear when disabled (default)