EnxDev commented on code in PR #45397:
URL: https://github.com/apache/superset/pull/45397#discussion_r4448086094


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superset-frontend/plugins/plugin-chart-echarts/src/Histogram/crossFilter.ts:
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@@ -0,0 +1,222 @@
+/**
+ * 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 {
+  DataRecordValue,
+  getColumnLabel,
+  getTimeFormatter,
+  QueryFormColumn,
+  QueryObjectFilterClause,
+} from '@superset-ui/core';
+import { GenericDataType } from '@apache-superset/core/common';
+import { formatSeriesName } from '../utils/series';
+
+/** Matches `optionLabel` in `src/utils/common.ts`. */
+const EMPTY_STRING = '<empty string>';

Review Comment:
   `Bubble/crossFilter.ts` already exports `EMPTY_STRING` and 
`toJsonSafeFilterValue`, and its toKeyPart, `getSelectedBubbleKeys `and 
`dimensionFilter `are the same code as `toKeyPart`, `getSelectedHistogramKeys 
`and the per-value branch of groupbyFilters here.
   
   Not a blocker, but since both files are yours, could the shared pieces move 
to a `src/utils/crossFilter.ts`, with `EMPTY_STRING` living in 
`src/constants.ts` next to NULL_STRING? Happy with that as a follow-up PR that 
touches both charts, if you'd rather keep this one focused.
   



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