Bug/fix replicate table primary keys

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.6.1
+current_version = 2.6.2
 parse = (?P<major>\d+)
 	\.(?P<minor>\d+)
 	\.(?P<patch>\d+)

CHANGELOG.md

@@ -1,3 +1,8 @@
+# tap-mssql 2.6.2 2024-10-09
+* Resolving issue when a table has a primary key and unique key. Both unique and primary key
+  columns were being identified as the primary key for the target table. Prioritising the
+  primary key first, and unique key secondary if there is no primary key.
+
 # tap-mssql 2.6.1 2024-10-09
 * Resolving issue with call get the prior LSN number (passing in unescaped table).
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tap-mssql"
-version = "2.6.1"
+version = "2.6.2"
 description = "A pipelinewise compatible tap for connecting Microsoft SQL Server"
 authors = ["Rob Winters <[email protected]>"]
 license = "GNU Affero"

tap_mssql/__init__.py

@@ -230,18 +230,31 @@ def discover_catalog(mssql_conn, config):
             table_info[db][table] = {"row_count": None, "is_view": table_type == "VIEW"}
         LOGGER.info("Tables fetched, fetching columns")
         cur.execute(
-            """with constraint_columns as (
+            """              with table_constraints as (
+                  select tc.TABLE_SCHEMA,
+                         tc.TABLE_NAME,
+                         tc.CONSTRAINT_NAME,
+                         tc.CONSTRAINT_TYPE,
+                         row_number() over (partition by tc.TABLE_SCHEMA, tc.TABLE_NAME
+                                                order by tc.constraint_TYPE) as row_number_rank
+
+                  from INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
+                  where tc.CONSTRAINT_TYPE in ('PRIMARY KEY', 'UNIQUE')
+               )
+               ,constraint_columns as (
                 select c.TABLE_SCHEMA
                 , c.TABLE_NAME
                 , c.COLUMN_NAME
+                , c.CONSTRAINT_NAME
 
                 from INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE c
 
-                join INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
+                join table_constraints tc
                         on tc.TABLE_SCHEMA = c.TABLE_SCHEMA
                         and tc.TABLE_NAME = c.TABLE_NAME
                         and tc.CONSTRAINT_NAME = c.CONSTRAINT_NAME
-                        and tc.CONSTRAINT_TYPE in ('PRIMARY KEY', 'UNIQUE'))
+                        and tc.row_number_rank = 1
+                )
                 SELECT c.TABLE_SCHEMA,
                     c.TABLE_NAME,
                     c.COLUMN_NAME,

tests/test_tap_mssql.py

@@ -650,6 +650,63 @@ def test_do_not_discover_key_properties_for_view(self):
 
         self.assertEqual(primary_keys, {"a_table": ["id"], "a_view": []})
 
+class TestPrimaryKeyUniqueKey(unittest.TestCase):
+    def setUp(self):
+        self.conn = test_utils.get_test_connection()
+
+        with connect_with_backoff(self.conn) as open_conn:
+            with open_conn.cursor() as cursor:
+                try:
+                    cursor.execute("drop table uc_only_table")
+                except:
+                    pass
+                try:
+                    cursor.execute("drop table pk_only_table")
+                except:
+                    pass
+                try:
+                    cursor.execute("drop table pk_uc_table")
+                except:
+                    pass
+                cursor.execute(
+                    """
+                    CREATE TABLE uc_only_table (
+                      pk int,
+                      uc_1 int,
+                      uc_2 int,
+                    CONSTRAINT constraint_uc_only_table UNIQUE(uc_1,uc_2)  )
+                    """
+                )
+                cursor.execute(
+                    """
+                    CREATE TABLE pk_only_table (
+                      pk int PRIMARY KEY,
+                      uc_1 int,
+                      uc_2 int,
+                    )
+                    """
+                )
+                cursor.execute(
+                    """
+                    CREATE TABLE pk_uc_table (
+                      pk int PRIMARY KEY,
+                      uc_1 int,
+                      uc_2 int,
+                    CONSTRAINT constraint_pk_uc_table UNIQUE(uc_1,uc_2)  )
+                    """
+                )
+
+    def test_only_primary_key(self):
+        catalog = test_utils.discover_catalog(self.conn, {})
+        primary_keys = {}
+        for c in catalog.streams:
+            primary_keys[c.table] = (
+                singer.metadata.to_map(c.metadata).get((), {}).get("table-key-properties")
+            )
+
+        self.assertEqual(primary_keys["uc_only_table"], ["uc_1","uc_2"])
+        self.assertEqual(primary_keys["pk_only_table"], ["pk"])
+        self.assertEqual(primary_keys["pk_uc_table"], ["pk"])
 
 if __name__ == "__main__":
     # test1 = TestBinlogReplication()