Push orderby criteria to data cube index queries.

dev/index.html

@@ -22,6 +22,7 @@
         <option value="flights-10m">Flights 10M</option>
         <option value="gaia">Gaia Star Catalog</option>
         <option value="hexbin">Hexbin</option>
+        <option value="highlight-cube">Highlight Cube</option>
         <option value="highlight-toggle">Highlight Toggle</option>
         <option value="images">Images</option>
         <option value="links">Links</option>

dev/yaml/highlight-cube.yaml

@@ -0,0 +1,46 @@
+data:
+  athletes: { file: data/athletes.csv }
+params:
+  query: { select: crossfilter }
+  selectNationality: { select: single }
+  selectSport: { select: single }
+vconcat:
+  - plot:
+    - mark: barX
+      data: { from: athletes, filterBy: $query }
+      x: { count: }
+      y: nationality
+      order: nationality
+      sort: {
+        y: '-x',
+        limit: 10
+      }
+    - select: highlight
+      by: $selectNationality
+    - select: toggleY
+      as: $selectNationality
+    - select: toggleY
+      as: $query
+      width: 600
+      height: 400
+    marginLeft: 80
+  - vspace: 10
+  - plot:
+    - mark: barX
+      data: { from: athletes, filterBy: $query }
+      x: { count: }
+      y: sport
+      order: sport
+      sort: {
+        y: '-x',
+        limit: 10
+      }
+    - select: highlight
+      by: $selectSport
+    - select: toggleY
+      as: $selectSport
+    - select: toggleY
+      as: $query
+      width: 600
+      height: 400
+    marginLeft: 80

packages/core/src/DataCubeIndexer.js

@@ -87,11 +87,15 @@ export class DataCubeIndexer {
         subqueryPushdown(subq, cols);
       }
 
+      // push orderby criteria to later cube queries
+      const order = query.orderby();
+      query.query.orderby = [];
+
       const sql = query.toString();
       const id = (fnv_hash(sql) >>> 0).toString(16);
       const table = `cube_index_${id}`;
       const result = mc.exec(create(table, sql, { temp }));
-      indices.set(client, { table, result, ...index });
+      indices.set(client, { table, result, order, ...index });
     }
   }
 
@@ -111,12 +115,13 @@ export class DataCubeIndexer {
       filter = this.activeView.predicate(this.selection.active.predicate);
     }
 
-    const { table, dims, aggr } = index;
+    const { table, dims, aggr, order = [] } = index;
     const query = Query
       .select(dims, aggr)
       .from(table)
       .groupby(dims)
-      .where(filter);
+      .where(filter)
+      .orderby(order);
     return this.mc.updateClient(client, query);
   }
 }