17 lines
804 B
MySQL
17 lines
804 B
MySQL
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{% macro redshift__alter_column_type(relation, column_name, new_column_type) -%}
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{%- set tmp_column = column_name + "__dbt_alter" -%}
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{% call statement('alter_column_type') %}
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alter table {{ relation }} add column {{ adapter.quote(tmp_column) }} {{ new_column_type }};
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{% if new_column_type.lower() == "super" %}
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update {{ relation }} set {{ adapter.quote(tmp_column) }} = JSON_PARSE({{ adapter.quote(column_name) }});
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{% else %}
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update {{ relation }} set {{ adapter.quote(tmp_column) }} = {{ adapter.quote(column_name) }};
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{% endif %}
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alter table {{ relation }} drop column {{ adapter.quote(column_name) }} cascade;
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alter table {{ relation }} rename column {{ adapter.quote(tmp_column) }} to {{ adapter.quote(column_name) }}
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{% endcall %}
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{% endmacro %}
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