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insert into in DBT prehook
{%- macro profile_schema(table_schema) -%}
{{ config(schema='profiles') }}
{% set not_null_profile_threshold_pct = ".9" %}
{% set unique_profile_threshold_pct = ".9" %}
{% set tables = dbt_utils.get_relations_by_prefix(table_schema, '') %}
SELECT column_stats.table_catalog,
column_stats.table_schema,
column_stats.table_name,
column_stats.column_name,
case when column_metadata.is_nullable = 'YES' then false else true end as is_not_nullable_column,
case when column_stats.pct_not_null > {{ not_null_profile_threshold_pct }} then true else false end as is_recommended_not_nullable_column,
column_stats._nulls as count_nulls,
column_stats._non_nulls as count_not_nulls,
column_stats.pct_not_null as pct_not_null,
column_stats.table_rows,
column_stats.count_distinct_values,
column_stats.pct_unique,
case when column_stats.pct_unique >= {{ unique_profile_threshold_pct }} then true else false end as is_recommended_unique_column,
column_metadata.* EXCEPT (table_catalog,
table_schema,
table_name,
column_name,
is_nullable),
column_stats.* EXCEPT (table_catalog,
table_schema,
table_name,
column_name,
_nulls,
_non_nulls,
pct_not_null,
table_rows,
pct_unique,
count_distinct_values)
FROM
(
{% for table in tables %}
SELECT *
FROM
(
WITH
`table` AS (SELECT * FROM {{ table }} ),
table_as_json AS (SELECT REGEXP_REPLACE(TO_JSON_STRING(t), r'^{|}$', '') AS ROW FROM `table` AS t ),
pairs AS (SELECT REPLACE(column_name, '"', '') AS column_name, IF (SAFE_CAST(column_value AS STRING)='null',NULL, column_value) AS column_value
FROM table_as_json,UNNEST(SPLIT(ROW, ',"')) AS z,UNNEST([SPLIT(z, ':')[SAFE_OFFSET(0)]]) AS column_name,UNNEST([SPLIT(z, ':')[SAFE_OFFSET(1)]]) AS column_value ),
profile AS (
SELECT
split(replace('{{ table }}','`',''),'.' )[safe_offset(0)] as table_catalog,
split(replace('{{ table }}','`',''),'.' )[safe_offset(1)] as table_schema,
split(replace('{{ table }}','`',''),'.' )[safe_offset(2)] as table_name,
column_name,
COUNT(*) AS table_rows,
COUNT(DISTINCT column_value) AS count_distinct_values,
safe_divide(COUNT(DISTINCT column_value),COUNT(*)) AS pct_unique,
COUNTIF(column_value IS NULL) AS _nulls,
COUNTIF(column_value IS NOT NULL) AS _non_nulls,
COUNTIF(column_value IS NOT NULL) / COUNT(*) AS pct_not_null,
min(column_value) as _min_value,
max(column_value) as _max_value,
avg(SAFE_CAST(column_value AS numeric)) as _avg_value,
APPROX_TOP_COUNT(column_value, 1)[OFFSET(0)] AS _most_frequent_value,
MIN(LENGTH(SAFE_CAST(column_value AS STRING))) AS _min_length,
MAX(LENGTH(SAFE_CAST(column_value AS STRING))) AS _max_length,
ROUND(AVG(LENGTH(SAFE_CAST(column_value AS STRING)))) AS _avr_length
FROM
pairs
WHERE
column_name <> ''
AND column_name NOT LIKE '%-%'
GROUP BY
column_name
ORDER BY
column_name)
SELECT
*
FROM
profile)
{%- if not loop.last %}
UNION ALL
{%- endif %}
{% endfor %}
) column_stats
LEFT OUTER JOIN
(
SELECT
* EXCEPT
(is_generated,
generation_expression,
is_stored,
is_updatable)
FROM
{{ table_schema }}.INFORMATION_SCHEMA.COLUMNS
) column_metadata
ON column_stats.table_catalog = column_metadata.table_catalog
AND column_stats.table_schema = column_metadata.table_schema
AND column_stats.table_name = column_metadata.table_name
AND column_stats.column_name = column_metadata.column_name
{%- endmacro -%}
Source: rittmananalytics.com
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