chore(viz): remove legacy explore_json + viz.py pipeline (#41714)

Co-authored-by: Claude Code <noreply@anthropic.com>

superset-frontend/plugins/plugin-chart-parallel-coordinates/src/buildQuery.ts

@@ -0,0 +1,53 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import {
+  buildQueryContext,
+  ensureIsArray,
+  QueryFormData,
+  QueryFormMetric,
+} from '@superset-ui/core';
+import { buildSortMetricOrderby } from '@superset-ui/chart-controls';
+
+/**
+ * Mirrors the query the legacy `para` viz built server-side: one query
+ * grouped by `series` selecting all metrics (including the secondary
+ * "color" metric, aliased into `metrics` by extractQueryFields). The
+ * sort metric is added to the select list so its ordering is visible in
+ * the result, and ordering is applied when `order_desc` is set.
+ */
+export default function buildQuery(formData: QueryFormData) {
+  const { timeseries_limit_metric, order_desc } = formData;
+  return buildQueryContext(formData, baseQueryObject => {
+    const { metrics, orderby } = buildSortMetricOrderby({
+      metrics: ensureIsArray(baseQueryObject.metrics) as QueryFormMetric[],
+      timeseriesLimitMetric: timeseries_limit_metric,
+      order_desc,
+      orderOnlyWhenDesc: true,
+    });
+    return [
+      {
+        ...baseQueryObject,
+        metrics,
+        // own the ordering entirely: the legacy pipeline ignored residual
+        // orderby fields (e.g. order_by_cols left over from other viz types)
+        orderby: orderby.length > 0 ? orderby : undefined,
+      },
+    ];
+  });
+}