24 lines
931 B
MySQL
24 lines
931 B
MySQL
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{#
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concat in dbt 0.6.4 used to work fine for bigquery but the new implementaion in 0.7.3 is less scalable (can not handle too many columns)
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Therefore, we revert the implementation here and add versions for missing destinations
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#}
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{% macro concat(fields) -%}
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{{ adapter.dispatch('concat')(fields) }}
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{%- endmacro %}
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{% macro bigquery__concat(fields) -%}
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{#-- concat() in SQL bigquery scales better with number of columns than using the '||' operator --#}
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concat({{ fields|join(', ') }})
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{%- endmacro %}
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{% macro sqlserver__concat(fields) -%}
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{#-- CONCAT() in SQL SERVER accepts from 2 to 254 arguments, we use batches for the main concat, to overcome the limit. --#}
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{% set concat_chunks = [] %}
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{% for chunk in fields|batch(253) -%}
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{% set _ = concat_chunks.append( "concat(" ~ chunk|join(', ') ~ ",'')" ) %}
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{% endfor %}
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concat({{ concat_chunks|join(', ') }}, '')
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{%- endmacro %}
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