feat: alter fulltext index (#196)

proto/greptime/v1/ddl.proto

@@ -110,6 +110,7 @@ message AlterExpr {
     RenameTable rename_table = 6;
     ChangeColumnTypes change_column_types = 7;
     ChangeTableOptions change_table_options = 8;
+    ChangeColumnFulltext change_column_fulltext = 9;
   }
 }
 
@@ -198,3 +199,15 @@ message AddColumnLocation {
   LocationType location_type = 1;
   string after_column_name = 2;
 }
+
+enum Analyzer {
+    ENGLISH = 0;
+    CHINESE = 1;
+}
+
+message ChangeColumnFulltext {
+    string column_name = 1;
+    bool enable = 2;
+    Analyzer analyzer = 3;
+    bool case_sensitive = 4;
+}

proto/greptime/v1/region/server.proto

@@ -129,6 +129,7 @@ message AlterRequest {
     DropColumns drop_columns = 3;
     ChangeColumnTypes change_column_types = 5;
     ChangeTableOptions change_table_options = 6;
+    ChangeColumnFulltext change_column_fulltext = 7;
   }
   // The version of the schema before applying the alteration.
   uint64 schema_version = 4;