Add an option to use INFORMATION_SCHEMA for partition info retrieval

Author: Kayrnt

.changes/unreleased/Features-20230807-235539.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Add an option to use INFORMATION_SCHEMA for partition info retrieval
+time: 2023-08-07T23:55:39.31409+02:00
+custom:
+  Author: Kayrnt
+  Issue: "867"

dbt/adapters/bigquery/connections.py

@@ -599,14 +599,11 @@ def _bq_job_link(location, project_id, job_id) -> str:
         return f"https://console.cloud.google.com/bigquery?project={project_id}&j=bq:{location}:{job_id}&page=queryresults"
 
     def get_partitions_metadata(self, table):
-        def standard_to_legacy(table):
-            return table.project + ":" + table.dataset + "." + table.identifier
+        query_sql = f"SELECT * FROM `{table.project}.{table.dataset}.INFORMATION_SCHEMA.PARTITIONS` WHERE TABLE_NAME = '{table.identifier}'"
 
-        legacy_sql = "SELECT * FROM [" + standard_to_legacy(table) + "$__PARTITIONS_SUMMARY__]"
-
-        sql = self._add_query_comment(legacy_sql)
+        sql = self._add_query_comment(query_sql)
         # auto_begin is ignored on bigquery, and only included for consistency
-        _, iterator = self.raw_execute(sql, use_legacy_sql=True)
+        _, iterator = self.raw_execute(sql)
         return self.get_table_from_response(iterator)
 
     def copy_bq_table(self, source, destination, write_disposition):

dbt/adapters/bigquery/impl.py

@@ -78,6 +78,7 @@ class PartitionConfig(dbtClassMixin):
     range: Optional[Dict[str, Any]] = None
     time_ingestion_partitioning: bool = False
     copy_partitions: bool = False
+    partition_information: str = "model"
 
     PARTITION_DATE = "_PARTITIONDATE"
     PARTITION_TIME = "_PARTITIONTIME"

dbt/include/bigquery/macros/etc.sql

@@ -6,6 +6,13 @@
   {% do adapter.grant_access_to(entity, entity_type, role, grant_target_dict) %}
 {% endmacro %}
 
+{#
+  This macro returns the partition metadata for provided table.
+  The expected input is a table object (ie through a `source` or `ref`).
+  The output contains the result from partitions information for your input table.
+  The details of the retrieved columns can be found on https://cloud.google.com/bigquery/docs/managing-partitioned-tables
+  It will leverage the INFORMATION_SCHEMA.PARTITIONS table.
+#}
 {%- macro get_partitions_metadata(table) -%}
   {%- if execute -%}
     {%- set res = adapter.get_partitions_metadata(table) -%}

dbt/include/bigquery/macros/materializations/incremental_strategy/common.sql

@@ -2,12 +2,68 @@
 
   {#-- TODO: revisit partitioning with python models --#}
   {%- if '_dbt_max_partition' in compiled_code and language == 'sql' -%}
+    {%- if partition_by.partition_information == "information_schema" -%}
+      {{ dbt_max_partition_from_information_schema_data_sql(relation, partition_by) }}
+    {%- else -%}
+      {{ dbt_max_partition_from_model_data_sql(relation, partition_by) }}
+    {%- endif -%}
 
-    declare _dbt_max_partition {{ partition_by.data_type_for_partition() }} default (
-      select max({{ partition_by.field }}) from {{ this }}
+  {%- endif -%}
+
+{% endmacro %}
+
+{% macro dbt_max_partition_from_model_data_sql(relation, partition_by) %}
+  declare _dbt_max_partition {{ partition_by.data_type_for_partition() }} default (
+      select max({{ partition_by.field }}) from {{ relation }}
       where {{ partition_by.field }} is not null
-    );
+  );
+{% endmacro %}
+
+{% macro max_partition_wrapper(field) %}
+  MAX({{ field }}) AS max_partition
+{% endmacro %}
+
+{% macro array_distinct_partition_wrapper(field) %}
+  as struct
+     -- IGNORE NULLS: this needs to be aligned to _dbt_max_partition, which ignores null
+     array_agg(distinct {{ field }} IGNORE NULLS)
+{% endmacro %}
+
+{% macro dbt_max_partition_from_information_schema_data_sql(relation, partition_by) %}
+  declare _dbt_max_partition {{ partition_by.data_type_for_partition() }} default (
+      {{ partition_from_information_schema_data_sql(relation, partition_by, max_partition_wrapper) }}
+  );
+{% endmacro %}
+
+{% macro partition_from_model_data_sql(relation, partition_by, field_function) %}
+  select {{ field_function(partition_by.render_wrapped()) }}
+  from {{ relation }}
+{% endmacro %}
+
+{% macro partition_from_information_schema_data_sql(relation, partition_by, field_function) %}
 
+  {%- set data_type = partition_by.data_type -%}
+  {%- set granularity = partition_by.granularity -%}
+
+  {# Format partition_id to match the declared variable type #}
+    {%- if data_type | lower in ('date', 'timestamp', 'datetime') -%}
+        {# Datetime using time partitioning require timestamp #}
+        {%- if partition_by.time_ingestion_partitioning and partition_by.data_type == 'datetime' -%}
+            {%- set data_type = 'timestamp' -%}
+        {%- endif -%}
+        {%- if granularity == "day" -%}
+            {%- set format = "%Y%m%d" -%}
+        {%- else -%}
+            {%- set format = "%Y%m%d%H" -%}
+        {%- endif -%}
+        {%- set field = "parse_"  ~ data_type ~ "('" ~ format ~ "', partition_id)" -%}
+    {%- else -%}
+        {%- set field = "CAST(partition_id AS INT64)" -%}
   {%- endif -%}
 
+  SELECT {{ field_function(field) }}
+  FROM `{{relation.project}}.{{relation.dataset}}.INFORMATION_SCHEMA.PARTITIONS`
+  WHERE TABLE_NAME = '{{relation.identifier}}'
+  AND NOT(STARTS_WITH(partition_id, "__"))
+
 {% endmacro %}

dbt/include/bigquery/macros/materializations/incremental_strategy/insert_overwrite.sql

@@ -107,8 +107,7 @@
     {%- endcall %}
   {%- endif -%}
   {%- set partitions_sql -%}
-    select distinct {{ partition_by.render_wrapped() }}
-    from {{ tmp_relation }}
+   {{ bq_dynamic_copy_partitions_affected_partitions_sql(tmp_relation, partition_by) }}
   {%- endset -%}
   {%- set partitions = run_query(partitions_sql).columns[0].values() -%}
   {# We copy the partitions #}
@@ -117,6 +116,19 @@
   drop table if exists {{ tmp_relation }}
 {% endmacro %}
 
+{% macro distinct_partition_wrapper(field) %}
+  distinct {{ field }} AS partition_ids
+{% endmacro %}
+
+{% macro bq_dynamic_copy_partitions_affected_partitions_sql(tmp_relation, partition_by) %}
+{% if partition_by.partition_information == "information_schema" %}
+  {{ partition_from_information_schema_data_sql(tmp_relation, partition_by, distinct_partition_wrapper) }}
+{% else %}
+  select distinct {{ partition_by.render_wrapped() }}
+  from {{ tmp_relation }}
+{% endif %}
+{% endmacro %}
+
 {% macro bq_dynamic_insert_overwrite_sql(tmp_relation, target_relation, sql, unique_key, partition_by, dest_columns, tmp_relation_exists, copy_partitions) %}
   {%- if copy_partitions is true %}
      {{ bq_dynamic_copy_partitions_insert_overwrite_sql(tmp_relation, target_relation, sql, unique_key, partition_by, dest_columns, tmp_relation_exists, copy_partitions) }}
@@ -149,10 +161,12 @@
 
       -- 2. define partitions to update
       set (dbt_partitions_for_replacement) = (
-          select as struct
-              -- IGNORE NULLS: this needs to be aligned to _dbt_max_partition, which ignores null
-              array_agg(distinct {{ partition_field }} IGNORE NULLS)
-          from {{ tmp_relation }}
+      {%- if partition_by.partition_information == "information_schema" -%}
+            {{ partition_from_information_schema_data_sql(tmp_relation, partition_by, array_distinct_partition_wrapper) }}
+          {%- else -%}
+            {# TODO fix datetime case to render_wrapped with timestamp #}
+            {{ partition_from_model_data_sql(tmp_relation, partition_by, array_distinct_partition_wrapper) }}
+          {%- endif -%}
       );
 
       -- 3. run the merge statement