fix: use encodeURIComponent when getting table metadata (#14790)

superset-frontend/src/SqlLab/actions/sqlLab.js

@@ -987,7 +987,9 @@ export function mergeTable(table, query) {
 function getTableMetadata(table, query, dispatch) {
   return SupersetClient.get({
     endpoint: encodeURI(
-      `/api/v1/database/${query.dbId}/table/${table.name}/${table.schema}/`,
+      `/api/v1/database/${query.dbId}/table/${encodeURIComponent(
+        table.name,
+      )}/${encodeURIComponent(table.schema)}/`,
     ),
   })
     .then(({ json }) => {