{% macro star(from, relation_alias=False, except=[], prefix='', suffix='', quote_identifiers=True, unquote_aliases=False, rename={}) -%}
    {{ return(adapter.dispatch('star', 'dbt_utils')(from, relation_alias, except, prefix, suffix, quote_identifiers, unquote_aliases, rename)) }}
{% endmacro %}

{% macro default__star(from, relation_alias=False, except=[], prefix='', suffix='', quote_identifiers=True, unquote_aliases=False, rename={}) -%}
    {%- do dbt_utils._is_relation(from, 'star') -%}
    {%- do dbt_utils._is_ephemeral(from, 'star') -%}

    {#-- Prevent querying of db in parsing mode. This works because this macro does not create any new refs. #}
    {%- if not execute -%}
        {% do return('*') %}
    {%- endif -%}

    {% set cols = dbt_utils.get_filtered_columns_in_relation(from, except) %}

    {%- set rename_lower = {} -%}
    {%- for key, val in rename.items() -%}
        {%- do rename_lower.update({key.lower(): val}) -%}
    {%- endfor -%}

    {%- if cols|length <= 0 -%}
        {% if flags.WHICH == 'compile' %}
            {% set response %}
*
/* No columns were returned. Maybe the relation doesn't exist yet
or all columns were excluded. This star is only output during
dbt compile, and exists to keep SQLFluff happy. */
            {% endset %}
            {% do return(response) %}
        {% else %}
            {% do return("/* no columns returned from star() macro */") %}
        {% endif %}
    {%- else -%}
        {%- for col in cols %}
            {%- if relation_alias %}{{ relation_alias }}.{% else %}{%- endif -%}
                {%- if quote_identifiers -%}
                    {{ adapter.quote(col)|trim }}
                    {%- if col.lower() in rename_lower %} as {{ rename_lower[col.lower()] }}
                    {%- elif unquote_aliases %} as {{ (prefix ~ col ~ suffix)|trim }}
                    {%- elif prefix!='' or suffix!='' %} as {{ adapter.quote(prefix ~ col ~ suffix)|trim }}
                    {%- endif -%}
                {%- else -%}
                    {{ col|trim }}
                    {%- if col.lower() in rename_lower %} as {{ rename_lower[col.lower()] }}
                    {%- elif prefix!='' or suffix!='' %} as {{ (prefix ~ col ~ suffix)|trim }}
                    {%- endif -%}
                {%- endif -%}
            {%- if not loop.last %},{{ '\n  ' }}{%- endif -%}
        {%- endfor -%}
    {% endif %}
{%- endmacro %}