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Output '*' in union_relations when no columns are found in compile mode #832

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Output '*' in union_relations when no columns are found in compile mode #832

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53703b9
Output '*' in union_relations when no columns are found in compile mode
martinshjung Sep 7, 2023
47ac8c0
Add entry to CHANGELOG.md
martinshjung Sep 7, 2023
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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -16,6 +16,7 @@
* Use QUALIFY clause in `deduplicate` macro for Redshift by @yauhen-sobaleu in https://github.com/dbt-labs/dbt-utils/pull/811
* get redshift external tables by @brendan-cook-87 in https://github.com/dbt-labs/dbt-utils/pull/753
* Equality test will now raise an error when the second model has less columns than the first by @rlh1994 in https://github.com/dbt-labs/dbt-utils/pull/765
* union_relations macro now outputs '*' in compile mode when the upstream relations haven't been built, such as when running SQLFluff on new models

### Documentation

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* @yamotech made their first contribution in https://github.com/dbt-labs/dbt-utils/pull/876
* @PChambino made their first contribution in https://github.com/dbt-labs/dbt-utils/pull/853
* @pruoff made their first contribution in https://github.com/dbt-labs/dbt-utils/pull/856
* @martinshjung made their first contribution in https://github.com/dbt-labs/dbt-utils/pull/832

**Full Changelog**: https://github.com/dbt-labs/dbt-utils/compare/1.1.1...1.2.0

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6 changes: 6 additions & 0 deletions macros/sql/union.sql
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Expand Up @@ -103,6 +103,12 @@
cast({{ dbt.string_literal(relation) }} as {{ dbt.type_string() }}) as {{ source_column_name }},
{%- endif %}

/* No columns from any of the relations.
This star is only output during dbt compile, and exists to keep SQLFluff happy. */
{% if dbt_command == 'compile' and ordered_column_names|length == 0 %}
*
{% endif %}

{% for col_name in ordered_column_names -%}

{%- set col = column_superset[col_name] %}
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