Add support for Azure Synapse External Tables

.circleci/config.yml

@@ -42,6 +42,17 @@ jobs:
       - store_artifacts:
           path: ./logs
 
+  integration-sqlserver:
+    docker:
+      - image: dataders/pyodbc:1.2
+    steps:
+      - checkout
+      - run:
+          name: "Run Tests - sqlserver"
+          command: ./run_test.sh sqlserver
+      - store_artifacts:
+          path: ./logs
+
 
 workflows:
   version: 2
@@ -50,3 +61,4 @@ workflows:
       - integration-redshift
       - integration-snowflake
       - integration-databricks
+      - integration-sqlserver

README.md

@@ -16,9 +16,12 @@ $ dbt run-operation stage_external_sources --vars 'ext_full_refresh: true'
 
 ![sample docs](etc/sample_docs.png)
 
-The macros assume that you have already created an external stage (Snowflake)
-or external schema (Redshift/Spectrum), and that you have permissions to select from it
-and create tables in it.
+The macros assume that you have already:
+- created either:
+  - an external stage (Snowflake),
+  - external schema (Redshift/Spectrum), or
+  - and external data source and file format (Synapse); and that you
+- have permissions to select from it and create tables in it.
 
 The `stage_external_sources` macro accepts a similar node selection syntax to
 [snapshotting source freshness](https://docs.getdbt.com/docs/running-a-dbt-project/command-line-interface/source/#specifying-sources-to-snapshot).
@@ -57,7 +60,12 @@ sources:
           table_properties:   # Hive specification
           options:          # Hive specification
             header: 'TRUE'
-
+          # ------ SYNAPSE ------
+          data_source: # External Data Source Name
+          reject_type: 
+          reject_value: 
+          ansi_nulls: 
+          quoted_identifier:
           # Snowflake: create an empty table + pipe instead of an external table
           snowpipe:
             auto_ingest:    true
@@ -124,3 +132,4 @@ as a dbt source and stage-ready external table in Snowflake and Spectrum.
 * Redshift (Spectrum)
 * Snowflake
 * Spark
+* Synapse

integration_tests/ci/sample.profiles.yml

@@ -40,3 +40,16 @@ integration_tests:
       endpoint: "{{ env_var('DBT_DATABRICKS_ENDPOINT') }}"
       token: "{{ env_var('DBT_DATABRICKS_TOKEN') }}"
       schema: dbt_external_tables_integration_tests_databricks
+
+    sqlserver:
+      type: sqlserver
+      driver: "ODBC Driver 17 for SQL Server"
+      port: 1433
+      host: "{{ env_var('DBT_SYNAPSE_SERVER') }}"
+      database: "{{ env_var('DBT_SYNAPSE_DB') }}"
+      username: "{{ env_var('DBT_SYNAPSE_UID') }}"
+      password: "{{ env_var('DBT_SYNAPSE_PWD') }}"
+      schema: dbt_external_tables_integration_tests_synapse
+      encrypt: 'yes'
+      trust_cert: 'yes'
+      threads: 1

integration_tests/dbt_project.yml

@@ -30,6 +30,8 @@ sources:
       +enabled: "{{ target.type == 'snowflake' }}"
     spark_external:
       +enabled: "{{ target.type == 'spark' }}"
+    sqlserver_external:
+      +enabled: "{{ target.type == 'sqlserver' }}"
 
 seeds:
   quote_columns: false

integration_tests/macros/dbt_utils_tsql.sql

@@ -0,0 +1,107 @@
+{% macro test_sqlserver__equal_rowcount(model) %}
+
+{% set compare_model = kwargs.get('compare_model', kwargs.get('arg')) %}
+
+{#-- Prevent querying of db in parsing mode. This works because this macro does not create any new refs. #}
+{%- if not execute -%}
+    {{ return('') }}
+{% endif %}
+
+with a as (
+
+    select count(*) as count_a from {{ model.include(database=False) }}
+
+),
+b as (
+
+    select count(*) as count_b from {{ compare_model.include(database=False) }}
+
+),
+final as (
+
+    select abs(
+            (select count_a from a) -
+            (select count_b from b)
+            )
+        as diff_count
+
+)
+
+select diff_count from final
+
+{% endmacro %}
+
+
+{% macro test_sqlserver__equality(model) %}
+
+
+{#-- Prevent querying of db in parsing mode. This works because this macro does not create any new refs. #}
+{%- if not execute -%}
+    {{ return('') }}
+{% endif %}
+
+-- setup
+{%- do dbt_utils._is_relation(model, 'test_equality') -%}
+
+{#-
+If the compare_cols arg is provided, we can run this test without querying the
+information schema — this allows the model to be an ephemeral model
+-#}
+{%- if not kwargs.get('compare_columns', None) -%}
+    {%- do dbt_utils._is_ephemeral(model, 'test_equality') -%}
+{%- endif -%}
+
+{% set compare_model = kwargs.get('compare_model', kwargs.get('arg')) %}
+{% set compare_columns = kwargs.get('compare_columns', adapter.get_columns_in_relation(model) | map(attribute='quoted') ) %}
+{% set compare_cols_csv = compare_columns | join(', ') %}
+
+with a as (
+
+    select * from {{ model.include(database=False) }}
+
+),
+
+b as (
+
+    select * from {{ compare_model.include(database=False) }}
+
+),
+
+a_minus_b as (
+
+    select {{compare_cols_csv}} from a
+    {{ dbt_utils.except() }}
+    select {{compare_cols_csv}} from b
+
+),
+
+b_minus_a as (
+
+    select {{compare_cols_csv}} from b
+    {{ dbt_utils.except() }}
+    select {{compare_cols_csv}} from a
+
+),
+
+unioned as (
+
+    select * from a_minus_b
+    union all
+    select * from b_minus_a
+
+),
+
+final as (
+
+    select (select count(*) from unioned) +
+        (select abs(
+            (select count(*) from a_minus_b) -
+            (select count(*) from b_minus_a)
+            ))
+        as count
+
+)
+
+select count from final
+
+{% endmacro %}

integration_tests/macros/prep_external.sql

@@ -43,3 +43,41 @@
     {% do run_query(create_external_stage) %}
 
 {% endmacro %}
+
+{% macro sqlserver__prep_external() %}
+
+    {% set external_data_source = target.schema ~ '.dbt_external_tables_testing' %}
+
+    {% set create_external_data_source %}
+        IF EXISTS ( SELECT * FROM sys.external_data_sources WHERE name = '{{external_data_source}}' )
+            DROP EXTERNAL DATA SOURCE [{{external_data_source}}];
+
+        CREATE EXTERNAL DATA SOURCE [{{external_data_source}}] WITH (
+            TYPE = HADOOP,
+            LOCATION = 'wasbs://[email protected]'
+        )
+    {% endset %}
+
+    {% set external_file_format = target.schema ~ '.dbt_external_ff_testing' %}
+
+    {% set create_external_file_format %}
+        IF EXISTS ( SELECT * FROM sys.external_file_formats WHERE name = '{{external_file_format}}' )
+            DROP EXTERNAL FILE FORMAT [{{external_file_format}}];
+
+        CREATE EXTERNAL FILE FORMAT [{{external_file_format}}] 
+        WITH (
+            FORMAT_TYPE = DELIMITEDTEXT, 
+            FORMAT_OPTIONS (
+                FIELD_TERMINATOR = N',', 
+                FIRST_ROW = 2, 
+                USE_TYPE_DEFAULT = True
+            )
+        )
+    {% endset %}
+
+    {% do log('Creating external data source ' ~ external_data_source, info = true) %}
+    {% do run_query(create_external_data_source) %}
+    {% do log('Creating external file format ' ~ external_file_format, info = true) %}
+    {% do run_query(create_external_file_format) %}
+
+{% endmacro %}

integration_tests/models/sqlserver.yml

@@ -0,0 +1,99 @@
+version: 2
+
+sources:
+  - name: sqlserver_external
+    schema: "{{ target.schema }}"
+    loader: ADLSblob
+
+    tables:
+
+      - name: people_csv_unpartitioned
+        external: &csv-people
+          location: '/csv'
+          file_format: "{{ target.schema ~ '.dbt_external_ff_testing' }}"
+          data_source: "{{ target.schema ~ '.dbt_external_tables_testing' }}"
+          reject_type: VALUE
+          reject_value: 0
+          ansi_nulls: true
+          quoted_identifier: true
+        columns: &cols-of-the-people
+          - name: id
+            data_type: int
+          - name: first_name
+            data_type: varchar(64)
+          - name: last_name
+            data_type: varchar(64)
+          - name: email
+            data_type: varchar(64)
+        tests: &equal-to-the-people
+          - sqlserver__equality:
+              compare_model: ref('people')
+              compare_columns:
+                - id
+                - first_name
+                - last_name
+                - email
+
+      - name: people_csv_partitioned
+        external:
+          <<: *csv-people
+          # SYNAPSE DOES NOT DO PARTITIONS
+          # (BUT WE COULD MAKE A WORKAROUND !!!)
+          # partitions: &parts-of-the-people
+          #   - name: section
+          #     data_type: varchar
+          #     expression: "substr(split_part(metadata$filename, 'section=', 2), 1, 1)"
+        columns: *cols-of-the-people
+        # tests: *equal-to-the-people
+
+      # JSON IS NOT SUPPORTED BY SYNAPSE ATM
+
+      # - name: people_json_unpartitioned
+      #   external: &json-people
+      #     location: '@{{ target.schema }}.dbt_external_tables_testing/json'
+      #     file_format: '( type = json )'
+      #   columns: *cols-of-the-people
+      #   tests: *equal-to-the-people
+
+      # - name: people_json_partitioned
+      #   external:
+      #     <<: *json-people
+      #     partitions: *parts-of-the-people
+      #   columns: *cols-of-the-people
+      #   tests: *equal-to-the-people
+
+      # NO COLUMNS BREAKS THINGS CURRENTLY
+      # just to test syntax
+      # - name: people_csv_unpartitioned_no_columns
+      #   external: *csv-people
+      #   tests: &same-rowcount
+      #     - sqlserver__equal_rowcount:
+      #         compare_model: ref('people')
+
+      # - name: people_csv_partitioned_no_columns
+      #   external:
+      #     <<: *csv-people
+          # partitions: *parts-of-the-people
+        # tests: *same-rowcount
+
+      # - name: people_json_unpartitioned_no_columns
+      #   external: *csv-people
+      #   tests: *same-rowcount
+
+      # - name: people_json_partitioned_no_columns
+      #   external:
+      #     <<: *json-people
+      #     partitions: *parts-of-the-people
+      #   tests: *same-rowcount
+
+      # - name: people_json_multipartitioned_no_columns
+      #   external:
+      #     <<: *json-people
+      #     partitions:
+      #       - name: file_type
+      #         data_type: varchar
+      #         expression: "split_part(metadata$filename, 'section=', 1)"
+      #       - name: section
+      #         data_type: varchar
+      #         expression: "substr(split_part(metadata$filename, 'section=', 2), 1, 1)"
+      #   tests: *same-rowcount

macros/external/create_external_table.sql

@@ -69,6 +69,35 @@
     file_format = {{external.file_format}}
 {% endmacro %}
 
+{% macro sqlserver__create_external_table(source_node) %}
+
+    {%- set columns = source_node.columns.values() -%}
+    {%- set external = source_node.external -%}
+
+    {% if external.ansi_nulls is true -%} SET ANSI_NULLS ON; {%- endif %}
+    {% if external.quoted_identifier is true -%} SET QUOTED_IDENTIFIER ON; {%- endif %}
+
+    create external table {{source(source_node.source_name, source_node.name)}} (
+        {% for column in columns %}
+            {# TODO set nullity based on schema tests?? #}
+            {%- set nullity = 'NULL' if 'not_null' in columns.tests else 'NOT NULL'-%}
+            {{adapter.quote(column.name)}} {{column.data_type}} {{nullity}}
+            {{- ',' if not loop.last -}}
+        {% endfor %}
+    )
+    WITH (
+        {% set dict = {'DATA_SOURCE': external.data_source,
+                       'LOCATION' : external.location, 
+                       'FILE_FORMAT' : external.file_format, 
+                       'REJECT_TYPE' : external.reject_type, 
+                       'REJECT_VALUE' : external.reject_value} -%}
+        {%- for key, value in dict.items() %}
+            {{key}} = {% if key == "LOCATION" -%} '{{value}}' {%- elif key in ["DATA_SOURCE","FILE_FORMAT"] -%} [{{value}}] {%- else -%} {{value}} {%- endif -%}
+            {{- ',' if not loop.last -}}
+            {%- endfor -%}
+    )
+{% endmacro %}
+
 {% macro bigquery__create_external_table(source_node) %}
     {{ exceptions.raise_compiler_error(
         "BigQuery does not support creating external tables in SQL/DDL.

macros/external/refresh_external_table.sql

@@ -80,6 +80,10 @@
 
 {% endmacro %}
 
+{% macro sqlserver__refresh_external_table(source_node) %}
+    {% do return([]) %}
+{% endmacro %}
+
 {% macro snowflake__refresh_external_table(source_node) %}
 
     {% set external = source_node.external %}