CockroachDB default types

In cockroachdb, the default values returns something like `field:::TIMESTAMPZ`, and the validation here is only by the default value, without its type, this regex is required.

Author: rwrz

migrator.go

@@ -424,6 +424,8 @@ func (m Migrator) ColumnTypes(value interface{}) (columnTypes []gorm.ColumnType,
 
 			if column.DefaultValueValue.Valid {
 				column.DefaultValueValue.String = regexp.MustCompile(`'(.*)'::[\w]+$`).ReplaceAllString(column.DefaultValueValue.String, "$1")
+				// cockroachdb, removing :::type
+				column.DefaultValueValue.String = regexp.MustCompile(`(.*):::[\w]+$`).ReplaceAllString(column.DefaultValueValue.String, "$1")
 			}
 
 			if datetimePrecision.Valid {