snowflake swagger (Azure#21552)

Co-authored-by: Zehua Chen <zehuachen@microsoft.com>

Author: touchdreamer

specification/synapse/data-plane/Microsoft.Synapse/preview/2021-06-01-preview/entityTypes/Pipeline.json

@@ -3643,7 +3643,10 @@
           "$ref": "#/definitions/SnowflakeExportCopyCommand",
           "description": "Snowflake export settings."
         }
-      }
+      },
+      "required": [
+        "exportSettings"
+      ]
     },
     "ExportSettings": {
       "description": "Export command settings.",

specification/synapse/data-plane/Microsoft.Synapse/stable/2020-12-01/entityTypes/Pipeline.json

@@ -3670,7 +3670,10 @@
           "$ref": "#/definitions/SnowflakeExportCopyCommand",
           "description": "Snowflake export settings."
         }
-      }
+      },
+      "required": [
+        "exportSettings"
+      ]
     },
     "ExportSettings": {
       "description": "Export command settings.",