kgabryje commented on a change in pull request #18569:
URL: https://github.com/apache/superset/pull/18569#discussion_r801805995



##########
File path: superset-frontend/src/explore/reducers/exploreReducer.js
##########
@@ -236,7 +237,46 @@ export default function exploreReducer(state = {}, action) 
{
         sliceName: action.slice.slice_name ?? state.sliceName,
       };
     },
+    [actions.SET_TIME_FORMATTED_COLUMN]() {
+      const newTimeFormattedColumns = { ...state.timeFormattedColumns };
+      const { datasourceId, columnName } = action;
+
+      if (Array.isArray(newTimeFormattedColumns[action.datasourceId])) {
+        newTimeFormattedColumns[datasourceId] = [
+          ...newTimeFormattedColumns[datasourceId],
+          columnName,
+        ];
+      } else {
+        newTimeFormattedColumns[datasourceId] = [columnName];
+      }
+      setItem(
+        LocalStorageKeys.explore__data_table_time_formatted_columns,
+        newTimeFormattedColumns,
+      );
+      return { ...state, timeFormattedColumns: newTimeFormattedColumns };
+    },
+    [actions.UNSET_TIME_FORMATTED_COLUMN]() {
+      const newTimeFormattedColumns = { ...state.timeFormattedColumns };
+      const { datasourceId, columnIndex } = action;
+
+      if (Array.isArray(newTimeFormattedColumns[datasourceId])) {
+        newTimeFormattedColumns[datasourceId] = [
+          ...newTimeFormattedColumns[datasourceId].slice(0, columnIndex),
+          ...newTimeFormattedColumns[datasourceId].slice(columnIndex + 1),
+        ];
+
+        if (newTimeFormattedColumns[datasourceId].length === 0) {
+          delete newTimeFormattedColumns[datasourceId];
+        }

Review comment:
       Both of those snippets create a copy of 
`newTimeFormattedColumns[datasourceId]` which we would need to assign to 
something, so it'd become
   ```
   newTimeFormattedColumns[datasourceId] = 
newTimeFormattedColumns[datasourceId].slice().splice(columnIndex, 1);
   ```
   which doesn't look very clean.
   However, I do agree that the current solution is hard to read, so here's 
what I propose:
   ```
   [actions.SET_TIME_FORMATTED_COLUMN]() {
         const { datasourceId, columnName } = action;
         const newTimeFormattedColumns = { ...state.timeFormattedColumns };
         const newTimeFormattedColumnsForDatasource =
           newTimeFormattedColumns[datasourceId].slice();
   
         if (Array.isArray(newTimeFormattedColumns[action.datasourceId])) {
           newTimeFormattedColumnsForDatasource.push(columnName);
         } else {
           newTimeFormattedColumns[datasourceId] = [columnName];
         }
         newTimeFormattedColumns[datasourceId] =
           newTimeFormattedColumnsForDatasource;
         setItem(
           LocalStorageKeys.explore__data_table_time_formatted_columns,
           newTimeFormattedColumns,
         );
         return { ...state, timeFormattedColumns: newTimeFormattedColumns };
       }
   ```
   And similar for `UNSET_TIME_FORMATTED_COLUMN`. WDYT?




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