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Handle incrementals on relations with no rows #20

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Handle incrementals on relations with no rows #20

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7 changes: 4 additions & 3 deletions macros/materializations/timestamp_incremental.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -7,11 +7,12 @@
{{ sql }}
) as dbt_incr_sbq

{#- Always include rows when the target_relation is empty, gets around null-is-false logic #}
where not exists (select 1 from {{ target_relation }})
{#- Generate a check for each timestamp column to ensure we only update changed rows -#}
{#- Note: it doesnt have to be a timestamp, any comparable type will work too, as long as newer rows have a bigger value -#}
{%- for col in dest_columns if col.name.endswith(timestamp_suffix) %}
{% if loop.first %}where {% else %} or {% endif -%}
{{ col.quoted }} > (select max({{ col.quoted }}) from {{ target_relation }})
or {{ col.quoted }} > (select max({{ col.quoted }}) from {{ target_relation }})
{%- endfor %}
{%- endmacro %}

Expand Down Expand Up @@ -70,4 +71,4 @@

{{ return({'relations': [target_relation]}) }}

{%- endmaterialization %}
{%- endmaterialization %}