fix: use average instead of sum as default aggregation for time series plot

The initial plot type for time filter animations defaults to
AGGREGATION_TYPES.sum, causing misleading y-axis values (e.g.
earthquake magnitudes showing as 2000/4000/6000 instead of actual
values). All other aggregation defaults in the codebase use average.

Fixes #3122

Signed-off-by: pierreeurope <pierre.europe@pm.me>

Author: pierreeurope

src/utils/src/plot.ts

@@ -698,6 +698,6 @@ export function getDefaultPlotType(filter, datasets) {
     interval,
     defaultTimeFormat,
     type: PLOT_TYPES.histogram,
-    aggregation: AGGREGATION_TYPES.sum
+    aggregation: AGGREGATION_TYPES.average
   };
 }

test/fixtures/test-csv-data.js

@@ -662,7 +662,7 @@ export const mergedTimeFilter = {
     interval: '1-hour',
     defaultTimeFormat: 'L  H A',
     type: 'histogram',
-    aggregation: 'sum'
+    aggregation: 'average'
   },
   yAxis: null,
   value: [1474606800000, 1474617600000],
@@ -712,7 +712,7 @@ export const mergedEpochFilter = {
     interval: '15-minute',
     defaultTimeFormat: 'L  LT',
     type: 'histogram',
-    aggregation: 'sum'
+    aggregation: 'average'
   },
   yAxis: null,
   value: [1472700000000, 1472760000000],
@@ -751,7 +751,7 @@ export const expectedSyncedTsFilter = {
     interval: '15-second',
     defaultTimeFormat: 'L  LTS',
     type: 'histogram',
-    aggregation: 'sum',
+    aggregation: 'average',
     colorsByDataId: {
       'test-csv-data-1': '#FF0000',
       'test-csv-data-2': '#00FF00'

test/node/reducers/vis-state-test.js

@@ -2938,7 +2938,7 @@ test('#visStateReducer -> setFilter.fixedDomain & DynamicDomain & gpu & cpu', as
     plotType: {
       type: 'histogram',
       interval: '15-second',
-      aggregation: 'sum',
+      aggregation: 'average',
       defaultTimeFormat: 'L  LTS'
     },
     yAxis: null,
@@ -3384,14 +3384,14 @@ test('#visStateReducer -> SET_FILTER_PLOT.yAxis', t => {
       interval: '15-second',
       defaultTimeFormat: 'L  LTS',
       type: 'lineChart',
-      aggregation: 'sum'
+      aggregation: 'average'
     },
     yAxis: yAxisField,
     lineChart: {
       yDomain: [0, 12124],
       xDomain: [1474070985000, 1474072215000],
       interval: '15-second',
-      aggregation: 'sum',
+      aggregation: 'average',
       series: {
         lines: [
           [
@@ -3416,15 +3416,15 @@ test('#visStateReducer -> SET_FILTER_PLOT.yAxis', t => {
             {x: 1474072050000, y: 4, delta: 'last', pct: -0.9069767441860465},
             {x: 1474072110000, y: 5, delta: 'last', pct: 0.25},
             {x: 1474072170000, y: 0, delta: 'last', pct: -1},
-            {x: 1474072200000, y: 13, delta: 'last', pct: null}
+            {x: 1474072200000, y: 6.5, delta: 'last', pct: null}
           ]
         ],
         markers: []
       },
       yAxis: 'uid',
-      title: 'Total of uid',
+      title: 'Average of uid',
       fieldType: 'integer',
-      allTime: {title: 'All Time Average', value: 580.5454545454545},
+      allTime: {title: 'All Time Average', value: 580.25},
       bins
     },
     speed: 1,

test/node/schemas/vis-state-schema-test.js

@@ -107,7 +107,7 @@ test('#visStateSchema -> v1 -> save load filters', t => {
         interval: '1-hour',
         defaultTimeFormat: 'L  H A',
         type: 'histogram',
-        aggregation: 'sum'
+        aggregation: 'average'
       },
       yAxis: null,
       animationWindow: 'free',

test/node/utils/filter-utils-test.js

@@ -567,7 +567,7 @@ test('filterUtils -> mergeFilterWithTimeline', t => {
       interval: '1-minute',
       defaultTimeFormat: 'L  LT',
       type: 'histogram',
-      aggregation: 'sum'
+      aggregation: 'average'
     },
     yAxis: null,
     gpu: true,

test/node/utils/timeline-test.js

@@ -22,7 +22,7 @@ test('#timeline -> getTimelineFromFilter', t => {
       interval: '5-minute',
       defaultTimeFormat: 'L  LT',
       type: 'histogram',
-      aggregation: 'sum'
+      aggregation: 'average'
     },
     yAxis: null,
     gpu: true,