Execute schema_changes conformance tests in cloud-spanner-emulator repo.
https://github.com/GoogleCloudPlatform/cloud-spanner-emulator/tree/v1.5.23/tests/conformance/data/schema_changes

https://docs.google.com/spreadsheets/d/1az8fj0L7LObNHxkuoRLNSUczyfOw_sQl9C_566zwHOc/edit?usp=sharing
INFO: It has many analysis errors so there are many non-parse errors

Source(to be refined)
https://gist.github.com/apstndb/db15a21c61ac9a2cfd396a3dcad0102a

I am planned to submit issues for each incompatibilies.