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Improve performance of delete+insert incremental strategy #151

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Improve performance of delete+insert incremental strategy #151

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773e8d3
Fix incremental delete+insert SQL
ataft Apr 10, 2024
b8b8a7f
Merge branch 'main' into main
colin-rogers-dbt Aug 9, 2024
66facbc
Merge branch 'main' into main
colin-rogers-dbt Oct 16, 2024
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6 changes: 6 additions & 0 deletions .changes/unreleased/Fixes-20240410-163601.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
kind: Fixes
body: Fix incremental delete+insert SQL
time: 2024-04-10T16:36:43.253228-05:00
custom:
Author: ataft
Issue: "150"
43 changes: 16 additions & 27 deletions dbt/include/global_project/macros/materializations/models/incremental/merge.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -61,34 +61,23 @@
{%- set dest_cols_csv = get_quoted_csv(dest_columns | map(attribute="name")) -%}

{% if unique_key %}
{% if unique_key is sequence and unique_key is not string %}
delete from {{target }}
using {{ source }}
where (
{% for key in unique_key %}
{{ source }}.{{ key }} = {{ target }}.{{ key }}
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@peterallenwebb and I took a look at this PR today.

This line of code is updated by #110, so we think that PR should be reviewed/merged prior to reviewing this PR further.

{{ "and " if not loop.last}}
{% endfor %}
{% if incremental_predicates %}
{% for predicate in incremental_predicates %}
and {{ predicate }}
{% endfor %}
{% endif %}
);
{% else %}
delete from {{ target }}
where (
{{ unique_key }}) in (
select ({{ unique_key }})
from {{ source }}
)
{%- if incremental_predicates %}
{% for predicate in incremental_predicates %}
and {{ predicate }}
{% endfor %}
{%- endif -%};

{% if unique_key is string %}
{% set unique_key = [unique_key] %}
{% endif %}

{%- set unique_key_str = unique_key|join(', ') -%}

delete from {{ target }}
where ({{ unique_key_str }}) in (
select distinct {{ unique_key_str }}
from {{ source }}
)
{%- if incremental_predicates %}
{% for predicate in incremental_predicates %}
and {{ predicate }}
{% endfor %}
{%- endif -%};

{% endif %}

insert into {{ target }} ({{ dest_cols_csv }})
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