1 files changed, 57 insertions, 1 deletions
diff --git a/vendor/github.com/uptrace/bun/dialect/feature/feature.go b/vendor/github.com/uptrace/bun/dialect/feature/feature.go
index 0707c6f88..89693fc21 100644
--- a/vendor/github.com/uptrace/bun/dialect/feature/feature.go
+++ b/vendor/github.com/uptrace/bun/dialect/feature/feature.go
@@ -1,6 +1,11 @@
 package feature
 
-import "github.com/uptrace/bun/internal"
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/uptrace/bun/internal"
+)
 
 type Feature = internal.Flag
 
@@ -35,4 +40,55 @@ const (
 	UpdateOrderLimit // UPDATE ... ORDER BY ... LIMIT ...
 	DeleteOrderLimit // DELETE ... ORDER BY ... LIMIT ...
 	DeleteReturning
+	AlterColumnExists // ADD/DROP COLUMN IF NOT EXISTS/IF EXISTS
 )
+
+type NotSupportError struct {
+	Flag Feature
+}
+
+func (err *NotSupportError) Error() string {
+	name, ok := flag2str[err.Flag]
+	if !ok {
+		name = strconv.FormatInt(int64(err.Flag), 10)
+	}
+	return fmt.Sprintf("bun: feature %s is not supported by current dialect", name)
+}
+
+func NewNotSupportError(flag Feature) *NotSupportError {
+	return &NotSupportError{Flag: flag}
+}
+
+var flag2str = map[Feature]string{
+	CTE:                  "CTE",
+	WithValues:           "WithValues",
+	Returning:            "Returning",
+	InsertReturning:      "InsertReturning",
+	Output:               "Output",
+	DefaultPlaceholder:   "DefaultPlaceholder",
+	DoubleColonCast:      "DoubleColonCast",
+	ValuesRow:            "ValuesRow",
+	UpdateMultiTable:     "UpdateMultiTable",
+	InsertTableAlias:     "InsertTableAlias",
+	UpdateTableAlias:     "UpdateTableAlias",
+	DeleteTableAlias:     "DeleteTableAlias",
+	AutoIncrement:        "AutoIncrement",
+	Identity:             "Identity",
+	TableCascade:         "TableCascade",
+	TableIdentity:        "TableIdentity",
+	TableTruncate:        "TableTruncate",
+	InsertOnConflict:     "InsertOnConflict",
+	InsertOnDuplicateKey: "InsertOnDuplicateKey",
+	InsertIgnore:         "InsertIgnore",
+	TableNotExists:       "TableNotExists",
+	OffsetFetch:          "OffsetFetch",
+	SelectExists:         "SelectExists",
+	UpdateFromTable:      "UpdateFromTable",
+	MSSavepoint:          "MSSavepoint",
+	GeneratedIdentity:    "GeneratedIdentity",
+	CompositeIn:          "CompositeIn",
+	UpdateOrderLimit:     "UpdateOrderLimit",
+	DeleteOrderLimit:     "DeleteOrderLimit",
+	DeleteReturning:      "DeleteReturning",
+	AlterColumnExists:    "AlterColumnExists",
+}