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Subvert insert_overwrite merge strategy to bring back merge #371

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Subvert insert_overwrite merge strategy to bring back merge #371

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49 changes: 36 additions & 13 deletions dbt/include/bigquery/macros/materializations/incremental_strategy/insert_overwrite.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -104,9 +104,7 @@
{%- if copy_partitions is true %}
{{ bq_dynamic_copy_partitions_insert_overwrite_sql(tmp_relation, target_relation, sql, unique_key, partition_by, dest_columns, tmp_relation_exists, copy_partitions) }}
{% else -%}
{% set predicate -%}
{{ partition_by.render_wrapped(alias='DBT_INTERNAL_DEST') }} in unnest(dbt_partitions_for_replacement)
{%- endset %}
{%- set is_exact_match_strategy = config.get('match_strategy', 'exact') == 'exact' -%}

{%- set source_sql -%}
(
Expand All @@ -119,7 +117,12 @@
{%- endset -%}

-- generated script to merge partitions into {{ target_relation }}
declare dbt_partitions_for_replacement array<{{ partition_by.data_type }}>;
{% if is_exact_match_strategy %}
declare dbt_partitions_for_replacement array<{{ partition_by.data_type }}>;
{% else %}
declare _dbt_min_partition_value {{ partition_by.data_type }};
declare _dbt_max_partition_value {{ partition_by.data_type }};
{% endif %}

{# have we already created the temp table to check for schema changes? #}
{% if not tmp_relation_exists %}
Expand All @@ -131,15 +134,35 @@
-- 1. temp table already exists, we used it to check for schema changes
{% endif %}

-- 2. define partitions to update
set (dbt_partitions_for_replacement) = (
select as struct
array_agg(distinct {{ partition_by.render_wrapped() }})
from {{ tmp_relation }}
);

-- 3. run the merge statement
{{ get_insert_overwrite_merge_sql(target_relation, source_sql, dest_columns, [predicate]) }};
{% if is_exact_match_strategy %}
-- 2. define partitions to update
set (dbt_partitions_for_replacement) = (
select as struct
array_agg(distinct {{ partition_by.render_wrapped() }})
from {{ tmp_relation }}
);

-- 3. run the merge statement
{% set predicate -%}
{{ partition_by.render_wrapped(alias='DBT_INTERNAL_DEST') }} in unnest(dbt_partitions_for_replacement)
{%- endset %}
{{ get_insert_overwrite_merge_sql(target_relation, source_sql, dest_columns, [predicate]) }};
{% else %}
-- 2. define partition ranges to update
set (_dbt_min_partition_value, _dbt_max_partition_value) = (
select as struct
min({{ partition_by.render_wrapped() }}),
max({{ partition_by.render_wrapped() }})
from {{ tmp_relation }}
);

-- 3. run the merge statement
{% set predicate -%}
{{ partition_by.render_wrapped(alias='DBT_INTERNAL_DEST') }}
BETWEEN _dbt_min_partition_value AND _dbt_max_partition_value
{%- endset %}
{{ get_merge_sql(target_relation, source_sql, unique_key, dest_columns, [predicate]) }};
{% endif %}

-- 4. clean up the temp table
drop table if exists {{ tmp_relation }}
Expand Down