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Desmond Hui
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README.md
54
README.md
@ -215,12 +215,64 @@ A set of macros and UDFs have been created to help with the creation of Snowflak
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``````
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10. Create the Tasks
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```
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dbt run-operation fsc_utils.create_gha_tasks --var '{"START_GHA_TASKS":True}'
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dbt run-operation fsc_utils.create_gha_tasks --vars '{"START_GHA_TASKS":True}'
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```
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> This will create the tasks in Snowflake and the workflows in GitHub Actions. The tasks will only be started if `START_GHA_TASKS` is set to `True` and the target is the production database for your project.
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11. Add a Data Dog CI Pipeline Alert on the logs of `dbt_test_tasks` to ensure that the test is checking the workflows successfully. See `Polygon Task Alert` in Data Dog for sample alert.
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## Dynamic Merge Predicate
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A macro to help with generating merge predicate statements for models in chain projects. Specifically this will output a concatenanted set of BETWEEN statements.
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### Setup and Usage ###
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The macro only supports generating predicates for column types of DATE and INTEGER
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#### Inline Usage ####
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{% set between_stmts = fsc_utils.dynamic_range_predicate("silver.my_temp_table", "block_timestamp::date") %}
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...
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SELECT
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*
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FROM
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some_other_table
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WHERE
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{{ between_stmts }}
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#### DBT Snowflake incremental_predicate Usage ####
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1. Requires overriding behavior of `get_merge_sql` macro
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2. Create a file in `macros/dbt/` ex: `macros/dbt/get_merge.sql`
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3. Copy this to the new file
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```
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{% macro get_merge_sql(target, source, unique_key, dest_columns, incremental_predicates) -%}
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{% set predicate_override = "" %}
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{% if incremental_predicates[0] == "dynamic_range_predicate" %}
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-- run some queries to dynamically determine the min + max of this 'date_column' in the new data
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{% set predicate_override = dynamic_range_predicate(source, incremental_predicates[1], "DBT_INTERNAL_DEST") %}
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{% endif %}
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{% set predicates = [predicate_override] if predicate_override else incremental_predicates %}
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-- standard merge from here
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{% set merge_sql = dbt.get_merge_sql(target, source, unique_key, dest_columns, predicates) %}
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{{ return(merge_sql) }}
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{% endmacro %}
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```
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4. Example usage
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```
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{{ config(
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...
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incremental_predicates = ["dynamic_range_predicate", "block_id"],
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...
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) }}
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```
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## Resources
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* Learn more about dbt [in the docs](https://docs.getdbt.com/docs/introduction)
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12
macros/dbt/get_merge.sql
Normal file
12
macros/dbt/get_merge.sql
Normal file
@ -0,0 +1,12 @@
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{% macro get_merge_sql(target, source, unique_key, dest_columns, incremental_predicates) -%}
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{% set predicate_override = "" %}
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{% if incremental_predicates[0] == "dynamic_range_predicate" %}
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-- run some queries to dynamically determine the min + max of this 'date_column' in the new data
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{% set predicate_override = dynamic_range_predicate(source, incremental_predicates[1], "DBT_INTERNAL_DEST") %}
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{% endif %}
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{% set predicates = [predicate_override] if predicate_override else incremental_predicates %}
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-- standard merge from here
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{% set merge_sql = dbt.get_merge_sql(target, source, unique_key, dest_columns, predicates) %}
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{{ return(merge_sql) }}
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{% endmacro %}
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113
macros/dynamic_range_predicate.sql
Normal file
113
macros/dynamic_range_predicate.sql
Normal file
@ -0,0 +1,113 @@
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{% macro dynamic_range_predicate(source, predicate_column, output_alias="") -%}
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{% set supported_data_types = ["INTEGER","DATE"] %}
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{% set predicate_column_data_type_query %}
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SELECT typeof({{predicate_column}}::variant)
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FROM {{ source }}
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WHERE {{predicate_column}} IS NOT NULL
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LIMIT 1;
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{% endset %}
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{% set predicate_column_data_type = run_query(predicate_column_data_type_query).columns[0].values()[0] %}
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{% if predicate_column_data_type not in supported_data_types %}
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{{ exceptions.raise_compiler_error("Data type of "~ predicate_column_data_type ~" is not supported, use one of "~ supported_data_types ~" column instead") }}
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{% endif %}
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{% set get_start_end_query %}
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SELECT
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MIN(
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{{ predicate_column }}
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) AS full_range_start,
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MAX(
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{{ predicate_column }}
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) AS full_range_end
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FROM
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{{ source }}
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{% endset %}
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{% set start_end_results = run_query(get_start_end_query).columns %}
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{% set start_preciate_value = start_end_results[0].values()[0] %}
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{% set end_predicate_value = start_end_results[1].values()[0] %}
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{% set get_limits_query %}
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WITH block_range AS (
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{% if predicate_column_data_type == "INTEGER" %}
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SELECT
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SEQ4() + {{ start_preciate_value }} as predicate_value
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FROM
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TABLE(GENERATOR(rowcount => {{ end_predicate_value - start_preciate_value }}+1))
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{% else %}
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SELECT
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date_day as predicate_value
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FROM
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crosschain.core.dim_dates
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WHERE
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date_day BETWEEN '{{ start_preciate_value }}' AND '{{ end_predicate_value }}'
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{% endif %}
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),
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partition_block_counts AS (
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SELECT
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b.predicate_value,
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COUNT(r.{{ predicate_column }}) AS count_in_window
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FROM
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block_range b
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LEFT OUTER JOIN {{ source }}
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r
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ON r.{{ predicate_column }} = b.predicate_value
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GROUP BY
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1
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),
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range_groupings AS (
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SELECT
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predicate_value,
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count_in_window,
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conditional_change_event(
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count_in_window > 0
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) over (
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ORDER BY
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predicate_value
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) AS group_val
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FROM
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partition_block_counts
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),
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contiguous_ranges AS (
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SELECT
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MIN(predicate_value) AS start_value,
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MAX(predicate_value) AS end_value
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FROM
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range_groupings
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WHERE
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count_in_window > 0
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GROUP BY
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group_val
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),
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between_stmts AS (
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SELECT
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CONCAT(
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'{{ output_alias~"." if output_alias else "" }}',
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'{{ predicate_column }} between \'',
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start_value,
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'\' and \'',
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end_value,
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'\''
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) AS b
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FROM
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contiguous_ranges
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)
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SELECT
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CONCAT('(', LISTAGG(b, ' OR '), ')')
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FROM
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between_stmts
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{% endset %}
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{% set between_stmts = run_query(get_limits_query).columns[0].values()[0] %}
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{% if between_stmts != '()' %}
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/* in case empty update array */
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{% set predicate_override = between_stmts %}
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{% else %}
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{% set predicate_override = '1=1' %}
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/* need to have something or it will error since it expects at least 1 predicate */
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{% endif %}
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{{ return(predicate_override) }}
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{% endmacro %}
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