feat(table): add tooltip to table header (#37179)

superset-frontend/plugins/plugin-chart-table/src/transformProps.ts

@@ -213,6 +213,7 @@ const processColumns = memoizeOne(function processColumns(
       percent_metrics: percentMetrics_,
       column_config: columnConfig = {},
     },
+    rawDatasource,
     queriesData,
   } = props;
   const granularity = extractTimegrain(props.rawFormData);
@@ -257,6 +258,12 @@ const processColumns = memoizeOne(function processColumns(
         ? config.currencyFormat
         : savedCurrency;
 
+      const description =
+        rawDatasource.columns?.find((item: any) => item.column_name === key)
+          ?.description ??
+        rawDatasource.metrics?.find((item: any) => item.metric_name === key)
+          ?.description;
+
       let formatter;
 
       if (isTime || config.d3TimeFormat) {
@@ -318,6 +325,7 @@ const processColumns = memoizeOne(function processColumns(
         isPercentMetric,
         formatter,
         config,
+        description,
         currencyCodeColumn,
       };
     });