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APP-1086: fix BigQuery nanosecond timestamp cast failure in edr_cast_as_timestamp #1003

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APP-1086: fix BigQuery nanosecond timestamp cast failure in edr_cast_as_timestamp #1003

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16 changes: 16 additions & 0 deletions macros/utils/data_types/cast_column.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,22 @@
cast({{ timestamp_field }} as {{ elementary.edr_type_timestamp() }})
{%- endmacro -%}

{#
BigQuery's TIMESTAMP type only supports microsecond precision (6 fractional digits).
Some runtimes (e.g. dbt-fusion) write nanosecond-precision strings like
'2026-04-03T10:50:50.961498756Z' into Elementary's metadata tables, which fail
to cast. This truncates any sub-microsecond fractional digits before casting.
#}
{%- macro bigquery__edr_cast_as_timestamp(timestamp_field) -%}
cast(
regexp_replace(
cast({{ timestamp_field }} as {{ elementary.edr_type_string() }}),
r'(\.\d{6})\d+',
r'\1'
) as {{ elementary.edr_type_timestamp() }}
)
{%- endmacro -%}

{# Athena and Trino needs explicit conversion for ISO8601 timestamps used in buckets_cte #}
{%- macro athena__edr_cast_as_timestamp(timestamp_field) -%}
coalesce(
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