Fix issues in the new ADD COLUMN constraint checking. Add preliminary
test cases. FossilOrigin-Name: 48434ad3fa9504c063d812d119bc8f622548fd02b3d478ff247b11474c4ce5db
D
drh committed
0f91a5352b7bb81beb27306d44ad630f3fd9d3cc
Parent: b4d9b2b