[DBM] - Use alternative query for sqlserver 2016 and older (#19110)

* [DBM] - Use alternative query for sqlserver 2016 and older

* fixes

* changelog

(cherry picked from commit 0c4e6a0)

sqlserver/changelog.d/19110.fixed

@@ -0,0 +1 @@
+Use alternative schema collection query for sqlserver 2016 and older due to STRING_AGG not being supported until SQLServer 2017

sqlserver/datadog_checks/sqlserver/queries.py

@@ -57,6 +57,36 @@
     i.is_unique, i.is_primary_key, i.is_unique_constraint, i.is_disabled;
 """
 
+INDEX_QUERY_PRE_2017 = """
+SELECT
+    i.object_id AS id,
+    i.name,
+    i.type,
+    i.is_unique,
+    i.is_primary_key,
+    i.is_unique_constraint,
+    i.is_disabled,
+    STUFF((
+        SELECT ',' + c.name
+        FROM sys.index_columns ic
+        JOIN sys.columns c ON ic.object_id = c.object_id AND ic.column_id = c.column_id
+        WHERE ic.object_id = i.object_id AND ic.index_id = i.index_id
+        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '') AS column_names
+FROM
+    sys.indexes i
+WHERE
+    i.object_id IN ({})
+GROUP BY
+    i.object_id,
+    i.name,
+    i.index_id,
+    i.type,
+    i.is_unique,
+    i.is_primary_key,
+    i.is_unique_constraint,
+    i.is_disabled;
+"""
+
 FOREIGN_KEY_QUERY = """
 SELECT
     FK.parent_object_id AS id,
@@ -74,6 +104,33 @@
     FK.name, FK.parent_object_id, FK.referenced_object_id;
 """
 
+FOREIGN_KEY_QUERY_PRE_2017 = """
+SELECT
+    FK.parent_object_id AS id,
+    FK.name AS foreign_key_name,
+    OBJECT_NAME(FK.parent_object_id) AS referencing_table,
+    STUFF((
+        SELECT ',' + COL_NAME(FKC.parent_object_id, FKC.parent_column_id)
+        FROM sys.foreign_key_columns AS FKC
+        WHERE FKC.constraint_object_id = FK.object_id
+        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '') AS referencing_column,
+    OBJECT_NAME(FK.referenced_object_id) AS referenced_table,
+    STUFF((
+        SELECT ',' + COL_NAME(FKC.referenced_object_id, FKC.referenced_column_id)
+        FROM sys.foreign_key_columns AS FKC
+        WHERE FKC.constraint_object_id = FK.object_id
+        FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '') AS referenced_column
+FROM
+    sys.foreign_keys AS FK
+WHERE
+    FK.parent_object_id IN ({})
+GROUP BY
+    FK.name,
+    FK.parent_object_id,
+    FK.object_id,
+    FK.referenced_object_id;
+"""
+
 XE_SESSION_DATADOG = "datadog"
 XE_SESSION_SYSTEM = "system_health"
 XE_SESSIONS_QUERY = f"""

sqlserver/datadog_checks/sqlserver/schemas.py

@@ -16,14 +16,17 @@
 from datadog_checks.sqlserver.const import (
     DEFAULT_SCHEMAS_COLLECTION_INTERVAL,
     STATIC_INFO_ENGINE_EDITION,
+    STATIC_INFO_MAJOR_VERSION,
     STATIC_INFO_VERSION,
     SWITCH_DB_STATEMENT,
 )
 from datadog_checks.sqlserver.queries import (
     COLUMN_QUERY,
     DB_QUERY,
     FOREIGN_KEY_QUERY,
+    FOREIGN_KEY_QUERY_PRE_2017,
     INDEX_QUERY,
+    INDEX_QUERY_PRE_2017,
     PARTITIONS_QUERY,
     SCHEMA_QUERY,
     TABLES_IN_SCHEMA_QUERY,
@@ -395,7 +398,10 @@ def _populate_with_partitions_data(self, table_ids, table_id_to_table_data, curs
 
     @tracked_method(agent_check_getter=agent_check_getter)
     def _populate_with_index_data(self, table_ids, table_id_to_table_data, cursor):
-        rows = execute_query(INDEX_QUERY.format(table_ids), cursor)
+        index_query = INDEX_QUERY
+        if self._check.static_info_cache.get(STATIC_INFO_MAJOR_VERSION) <= 2016:
+            index_query = INDEX_QUERY_PRE_2017
+        rows = execute_query(index_query.format(table_ids), cursor)
         for row in rows:
             table_id = row.pop("id", None)
             table_id_str = str(table_id)
@@ -412,7 +418,10 @@ def _populate_with_index_data(self, table_ids, table_id_to_table_data, cursor):
 
     @tracked_method(agent_check_getter=agent_check_getter, track_result_length=True)
     def _populate_with_foreign_keys_data(self, table_ids, table_id_to_table_data, cursor):
-        rows = execute_query(FOREIGN_KEY_QUERY.format(table_ids), cursor)
+        foreign_key_query = FOREIGN_KEY_QUERY
+        if self._check.static_info_cache.get(STATIC_INFO_MAJOR_VERSION) <= 2016:
+            foreign_key_query = FOREIGN_KEY_QUERY_PRE_2017
+        rows = execute_query(foreign_key_query.format(table_ids), cursor)
         for row in rows:
             table_id = row.pop("id", None)
             table_id_str = str(table_id)