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vendor/gorm.io/driver/postgres/migrator.go

@@ -38,6 +38,7 @@ WHERE
 `
 
 var typeAliasMap = map[string][]string{
+	"int":                      {"integer"},
 	"int2":                     {"smallint"},
 	"int4":                     {"integer"},
 	"int8":                     {"bigint"},
@@ -50,6 +51,15 @@ var typeAliasMap = map[string][]string{
 	"timestamp with time zone": {"timestamptz"},
 	"bool":                     {"boolean"},
 	"boolean":                  {"bool"},
+	"serial2":                  {"smallserial"},
+	"serial4":                  {"serial"},
+	"serial8":                  {"bigserial"},
+	"varbit":                   {"bit varying"},
+	"char":                     {"character"},
+	"varchar":                  {"character varying"},
+	"float4":                   {"real"},
+	"float8":                   {"double precision"},
+	"timetz":                   {"time with time zone"},
 }
 
 type Migrator struct {
@@ -312,7 +322,7 @@ func (m Migrator) AlterColumn(value interface{}, field string) error {
 				fileType := clause.Expr{SQL: m.DataTypeOf(field)}
 				// check for typeName and SQL name
 				isSameType := true
-				if fieldColumnType.DatabaseTypeName() != fileType.SQL {
+				if !strings.EqualFold(fieldColumnType.DatabaseTypeName(), fileType.SQL) {
 					isSameType = false
 					// if different, also check for aliases
 					aliases := m.GetTypeAliases(fieldColumnType.DatabaseTypeName())