Ensure that columns should be merged if the newly added column is present in the parent table. Fixes #6780

docs/en_US/release_notes.rst

@@ -11,6 +11,7 @@ notes for it.
 .. toctree::
    :maxdepth: 1
 
+   release_notes_6_2
    release_notes_6_1
    release_notes_6_0
    release_notes_5_7

docs/en_US/release_notes_6_2.rst

@@ -0,0 +1,21 @@
+************
+Version 6.2
+************
+
+Release date: 2021-11-18
+
+This release contains a number of bug fixes and new features since the release of pgAdmin4 6.1.
+
+New features
+************
+
+
+
+Housekeeping
+************
+
+
+Bug fixes
+*********
+
+| `Issue #6780 <https://redmine.postgresql.org/issues/6780>`_ -  Ensure that columns should be merged if the newly added column is present in the parent table.

web/pgadmin/browser/server_groups/servers/databases/schemas/tables/static/js/table.ui.js

@@ -537,7 +537,24 @@ export default class TableSchema extends BaseUISchema {
             tabColsResponse.then((res)=>{
               resolve((state)=>{
                 let finalCols = res.map((col)=>obj.columnsSchema.getNewData(col));
-                finalCols = [...state.columns, ...finalCols];
+                let currentSelectedCols = [];
+                if (!_.isEmpty(state.columns)){
+                  currentSelectedCols = state.columns;
+                }
+                let colNameList = [];
+                state.columns.forEach((col=>{
+                  colNameList.push(col.name);
+                }));
+                for (let col of Object.values(finalCols)) {
+                  if(!colNameList.includes(col.name)){
+                    currentSelectedCols.push(col);
+                  }
+                }
+
+                if (!_.isEmpty(currentSelectedCols)){
+                  finalCols = currentSelectedCols;
+                }
+
                 obj.changeColumnOptions(finalCols);
                 return {
                   adding_inherit_cols: false,

web/regression/javascript/schema_ui_files/table.ui.spec.js

@@ -277,10 +277,10 @@ describe('TableSchema', ()=>{
         },
       });
       deferredPromise.then((depChange)=>{
-        let finalCols = [newCol, newCol];
+        let finalCols = [newCol];
         expect(depChange(state)).toEqual({
           adding_inherit_cols: false,
-          columns: [newCol, newCol],
+          columns: [newCol],
         });
         expect(schemaObj.changeColumnOptions).toHaveBeenCalledWith(finalCols);
         done();