Modifying nullable column to non-nullable might fail in case it contains NULL values. For example:
ALTER TABLE t MODIFY COLUMN c int NOT NULL;
The solution, in this case, is to backfill NULL values with a default value:
UPDATE t SET c = 0 WHERE c IS NULL; ALTER TABLE t MODIFY COLUMN c int NOT NULL;
Enforce this kind of safety using the Atlas GitHub Action: https://atlasgo.io/integrations/github-actions
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