Merge pull request #347 from tinybirdco/341-use-case-drop-column

Drop column version from analytics_events

Author: joscalv

drop_column/README.MD

@@ -0,0 +1,38 @@
+# Alter datasource removing a column
+
+[Pull Request](https://github.com/tinybirdco/use-case-examples/pull/347)
+
+- Just remove the column from the schema and apply the changes. If there are dependent materialized views the CLI will list them and ask for confirmation.
+
+
+```diff
+SCHEMA >
+-    `version` LowCardinality(String) `json:$.version`,
+```
+
+- Create a PR with the change above, a new branch will be created as part of the CI process. You can double check the changes checking the datasource schema.
+
+- To deploy the change, merge to PR to you main branch, the CD job will run and will deploy the changes.
+
+```
+...
+** Detecting changes from last commit ...
+** Diffs from current commit '3afc8032b98c2f961e370fc1dda10b2a783fdc02' and new 'b0d520d2b0a2077326cd71a8111c7e6daa97048c':
+	modified:	drop_column/datasources/analytics_events.datasource
+
+** Preparing commit ...
+** Processing ./datasources/analytics_events.datasource
+** Building dependencies
+
+** [DRY RUN] Deploying commit ...
+** [DRY RUN] Running 'analytics_events' 
+
+** Deploying commit ...
+** Running 'analytics_events' 
+** The description or schema of 'analytics_events' has changed.
+**   -  DROP COLUMN `version`
+** The Data Source has been correctly updated.
+** 'analytics_events' created
+** Not pushing fixtures
+...
+```

drop_column/datasources/analytics_events.datasource

@@ -7,7 +7,6 @@ SCHEMA >
     `timestamp` DateTime `json:$.timestamp`,
     `session_id` String `json:$.session_id`,
     `action` LowCardinality(String) `json:$.action`,
-    `version` LowCardinality(String) `json:$.version`,
     `payload` String `json:$.payload`
 
 ENGINE "MergeTree"