Closes Taskana#2637 - add update scripts from 8.1 to 8.2

Author: ryzheboka

common/taskana-common/src/main/resources/sql/db2/taskana_schema_update_8.1.0_to_8.2.0_db2.sql

@@ -0,0 +1,19 @@
+-- this script updates the TASKANA database schema from version 8.1.0. to version 8.2.0.
+SET SCHEMA %schemaName%;
+
+INSERT INTO TASKANA_SCHEMA_VERSION (ID, VERSION, CREATED)
+VALUES (TASKANA_SCHEMA_VERSION_ID_SEQ.NEXTVAL, '8.2.0', CURRENT_TIMESTAMP);
+
+ALTER TABLE TASK
+    ADD COLUMN NUMBER_OF_COMMENTS INT DEFAULT 0;
+
+UPDATE TASK t
+SET NUMBER_OF_COMMENTS = subquery.COMMENT_COUNT
+FROM (
+  SELECT t.ID, COUNT(tc.ID) AS COMMENT_COUNT
+  FROM TASK t
+  RIGHT OUTER JOIN TASK_COMMENT tc
+  ON t.ID = tc.TASK_ID
+  GROUP BY t.ID
+) AS subquery
+WHERE t.ID = subquery.ID;

common/taskana-common/src/main/resources/sql/h2/taskana_schema_update_8.1.0_to_8.2.0_h2.sql

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+-- this script updates the TASKANA database schema from version 8.1.0 to version 8.2.0.
+SET SCHEMA %schemaName%;
+
+INSERT INTO TASKANA_SCHEMA_VERSION (ID, VERSION, CREATED)
+VALUES (nextval('TASKANA_SCHEMA_VERSION_ID_SEQ'), '8.2.0', CURRENT_TIMESTAMP);
+
+ALTER TABLE TASK
+    ADD COLUMN NUMBER_OF_COMMENTS INT DEFAULT 0;
+
+UPDATE TASK t
+SET NUMBER_OF_COMMENTS = (
+	SELECT COUNT(tc.ID)
+	FROM TASK_COMMENT tc
+	WHERE tc.TASK_ID = t.ID
+)
+WHERE EXISTS (
+	SELECT 1
+	FROM TASK_COMMENT tc
+	WHERE tc.TASK_ID = t.ID
+);

common/taskana-common/src/main/resources/sql/oracle/taskana_schema_update_8.1.0_to_8.2.0_oracle.sql

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+-- this script updates the TASKANA database schema from version 8.1.0 to version 8.2.0.
+ALTER SESSION SET CURRENT_SCHEMA = %schemaName%;
+
+INSERT INTO TASKANA_SCHEMA_VERSION (ID, VERSION, CREATED)
+VALUES (nextval('TASKANA_SCHEMA_VERSION_ID_SEQ'), '8.2s.0', CURRENT_TIMESTAMP);
+
+ALTER TABLE TASK
+    ADD COLUMN NUMBER_OF_COMMENTS INT DEFAULT 0;
+
+UPDATE TASK t
+SET NUMBER_OF_COMMENTS = subquery.COMMENT_COUNT
+FROM (
+  SELECT t.ID, COUNT(tc.ID) AS COMMENT_COUNT
+  FROM TASK t
+  RIGHT OUTER JOIN TASK_COMMENT tc
+  ON t.ID = tc.TASK_ID
+  GROUP BY t.ID
+) AS subquery
+WHERE t.ID = subquery.ID;

common/taskana-common/src/main/resources/sql/postgres/taskana_schema_update_8.1.0_to_8.2.0_postgres.sql

@@ -0,0 +1,20 @@
+-- this script updates the TASKANA database schema from version 8.1.0 to version 8.2.0.
+
+SET search_path = %schemaName%;
+
+INSERT INTO TASKANA_SCHEMA_VERSION (ID, VERSION, CREATED)
+VALUES (nextval('TASKANA_SCHEMA_VERSION_ID_SEQ'), '8.2.0', CURRENT_TIMESTAMP);
+
+ALTER TABLE TASK
+    ADD COLUMN NUMBER_OF_COMMENTS INT DEFAULT 0;
+
+UPDATE TASK t
+SET NUMBER_OF_COMMENTS = subquery.COMMENT_COUNT
+FROM (
+  SELECT t.ID, COUNT(tc.ID) AS COMMENT_COUNT
+  FROM TASK t
+  RIGHT OUTER JOIN TASK_COMMENT tc
+  ON t.ID = tc.TASK_ID
+  GROUP BY t.ID
+) AS subquery
+WHERE t.ID = subquery.ID;