github.com/solvedata/migrate/v4@v4.8.7-0.20201127053940-c9fba4ce569f/database (about) cassandra clickhouse cockroachdb crate driver.go driver_test.go error.go firebird ksql mongodb mysql neo4j parse_test.go postgres ql redshift shell spanner sqlite3 sqlserver stub testing util.go util_test.go