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add alter_column_type macro #64

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add alter_column_type macro #64

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97e06a5
add alter_column_type macro
Sep 23, 2021
2b6cdb5
add fix to changelog
Sep 23, 2021
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6 changes: 6 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,11 @@
# Changelog

## v.0.21

### Fixes

- Resolves bug for running incremental models where the macro `alter_column_type` had incorrect syntax

## v.0.20.0

### Features
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17 changes: 16 additions & 1 deletion dbt/include/synapse/macros/adapters.sql
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Expand Up @@ -71,7 +71,7 @@
{# TODO instead of deleting it... #}
{% macro synapse__rename_relation(from_relation, to_relation) -%}
{% call statement('rename_relation') -%}

rename object {{ from_relation.include(database=False) }} to {{ to_relation.identifier }}
{%- endcall %}
{% endmacro %}
Expand Down Expand Up @@ -158,3 +158,18 @@
{% set table = load_result('get_columns_in_relation').table %}
{{ return(sql_convert_columns_in_relation(table)) }}
{% endmacro %}

{% macro synapse__alter_column_type(relation, column_name, new_column_type) %}

{%- set tmp_column = column_name + "__dbt_alter" -%}

{% call statement('alter_column_type') -%}

alter {{ relation.type }} {{ relation }} add {{ tmp_column }} {{ new_column_type }};
update {{ relation }} set {{ tmp_column }} = {{ column_name }};
alter {{ relation.type }} {{ relation }} drop column {{ column_name }};
exec sp_rename '{{ relation | replace('"', '') }}.{{ tmp_column }}', '{{ column_name }}', 'column'

{%- endcall -%}

{% endmacro %}