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Simplify for scalability #504

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Simplify for scalability #504

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52 changes: 5 additions & 47 deletions dbt/include/sqlserver/macros/materializations/snapshots/snapshot.sql
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Original file line number Diff line number Diff line change
@@ -1,52 +1,10 @@
{#
Fabric uses the 'CREATE TABLE XYZ AS SELECT * FROM ABC' syntax to create tables.
SQL Server doesnt support this, so we use the 'SELECT * INTO XYZ FROM ABC' syntax instead.
#}

{% macro sqlserver__create_columns(relation, columns) %}
{# default__ macro uses "add column"
TSQL preferes just "add"
#}

{% set columns %}
{% for column in columns %}
, CAST(NULL AS {{column.data_type}}) AS {{ column.quoted }}
{% endfor %}
{% endset %}

{% set tempTableName %}
[{{relation.database}}].[{{ relation.schema }}].[{{ relation.identifier }}_{{ range(1300, 19000) | random }}]
{% endset %}

{% set tempTable %}
SELECT * {{columns}} INTO {{tempTableName}} FROM [{{relation.database}}].[{{ relation.schema }}].[{{ relation.identifier }}] {{ information_schema_hints() }}
{% endset %}

{% call statement('create_temp_table') -%}
{{ tempTable }}
{%- endcall %}

{% set dropTable %}
DROP TABLE [{{relation.database}}].[{{ relation.schema }}].[{{ relation.identifier }}]
{% endset %}

{% call statement('drop_table') -%}
{{ dropTable }}
{%- endcall %}

{% set createTable %}
SELECT * INTO {{ relation }} FROM {{tempTableName}} {{ information_schema_hints() }}
{% endset %}

{% call statement('create_Table') -%}
{{ createTable }}
{%- endcall %}

{% set dropTempTable %}
DROP TABLE {{tempTableName}}
{% endset %}

{% call statement('drop_temp_table') -%}
{{ dropTempTable }}
{%- endcall %}
{% for column in columns %}
{% call statement() %}
alter table {{ relation }} add "{{ column.name }}" {{ column.data_type }};
{% endcall %}
{% endfor %}
{% endmacro %}