[libgda] GdaDdlModifiable: Adding error for the domain

[Pavlo Solntsev <psolntsev src gnome org>]

commit 2a4d7be4daa0c3497a169d5a6f8d43143c8ab538
Author: Pavlo Solntsev <p sun fun gmail com>
Date:   Thu May 28 13:02:58 2020 -0500

    GdaDdlModifiable: Adding error for the domain

 libgda/gda-ddl-modifiable.c | 2 ++
 libgda/gda-ddl-modifiable.h | 7 +++++++
 2 files changed, 9 insertions(+)
---
diff --git a/libgda/gda-ddl-modifiable.c b/libgda/gda-ddl-modifiable.c
index a02054cdb..a43814d23 100644
--- a/libgda/gda-ddl-modifiable.c
+++ b/libgda/gda-ddl-modifiable.c
@@ -22,6 +22,8 @@
 #define G_LOG_DOMAIN "GDA-ddl-modifiable"
 #include "gda-ddl-modifiable.h"
 
+G_DEFINE_QUARK (gda_ddl_modifiable_error, gda_ddl_modifiable_error)
+
 /**
  * SECTION:gda-ddl-operation
  * @title: GdaDdlModifiable
diff --git a/libgda/gda-ddl-modifiable.h b/libgda/gda-ddl-modifiable.h
index 838c369d7..1aef8e658 100644
--- a/libgda/gda-ddl-modifiable.h
+++ b/libgda/gda-ddl-modifiable.h
@@ -51,6 +51,13 @@ struct _GdaDdlModifiableInterface
                      GError **error);
 };
 
+typedef enum {
+    GDA_DDL_MODIFIABLE_NOT_IMPLEMENTED
+} GdaDdlModifiableErrror;
+
+#define GDA_DDL_MODIFIABLE_ERROR gda_ddl_modifiable_error_quark()
+GQuark gda_ddl_modifiable_error_quark (void);
+
 gboolean gda_ddl_modifiable_create (GdaDdlModifiable *self,
                                     GdaConnection *cnc,
                                     gpointer user_data,