mrwunderbar666 opened a new issue, #20990:
URL: https://github.com/apache/echarts/issues/20990
### What problem does this feature solve?
Currently, the `FilterTransform` in Apache ECharts supports a rich set of
conditional expressions including relational and logical operators (lt, gt, eq,
reg, and, or, not, etc.). However, it does not support a mechanism to check
whether a data value exists within a specified list—commonly known as an "in"
operation.
Please add support for an `in` operator in `RelationalExpressionOption`,
allowing developers to filter values based on membership in a list or array.
This would greatly enhance the expressiveness and efficiency of data filtering
within ECharts.
- Many filtering scenarios require selecting rows where a field matches
one of several known values.
- Current alternatives require verbose or expressions, which are harder
to write, maintain, and optimize.
- The in operator is standard in SQL and many query DSLs, and users
naturally expect this functionality.
- Improves developer ergonomics and code clarity.
- Aligns with common querying patterns.
- Enhances performance for large datasets by allowing ECharts to optimize
"in" checks internally.
### What does the proposed API look like?
```javascript
type RelationalExpressionOption = {
dimension: DimensionName | DimensionIndex;
parser?: 'time' | 'trim' | 'number';
in?: DataValue[]; // New operator for array membership
notIn?: DataValue[]; // Optional complement for exclusion
// existing operators...
};
// Usage example:
transform: {
type: 'filter',
config: {
in: ['Apple', 'Banana', 'Orange'],
dimension: 'fruit'
}
}
```
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