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Transformations: Add an All Unique Values Reducer (#48653)

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Josiah (Jay) Goodson 2022-05-04 14:58:46 -04:00 committed by GitHub
parent dac8abfc2c
commit 570ff074f6
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9
packages/grafana-data/src/transformations/fieldReducer.test.ts
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@ -97,6 +97,15 @@ describe('Stats Calculators', () => {
expect(stats.delta).toEqual(300); expect(stats.delta).toEqual(300);
}); });
it('should calculate unique values', () => {
const stats = reduceField({
field: createField('x', [1, 2, 2, 3, 1]),
reducers: [ReducerID.uniqueValues],
});
expect(stats.uniqueValues).toEqual([1, 2, 3]);
});
it('consistently check allIsNull/allIsZero', () => { it('consistently check allIsNull/allIsZero', () => {
const empty = createField('x'); const empty = createField('x');
const allNull = createField('x', [null, null, null, null]); const allNull = createField('x', [null, null, null, null]);

10
packages/grafana-data/src/transformations/fieldReducer.ts
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@ -25,6 +25,7 @@ export enum ReducerID {
allIsZero = 'allIsZero', allIsZero = 'allIsZero',
allIsNull = 'allIsNull', allIsNull = 'allIsNull',
allValues = 'allValues', allValues = 'allValues',
uniqueValues = 'uniqueValues',
} }
// Internal function // Internal function
@ -237,6 +238,15 @@ export const fieldReducers = new Registry<FieldReducerInfo>(() => [
standard: false, standard: false,
reduce: (field: Field) => ({ allValues: field.values.toArray() }), reduce: (field: Field) => ({ allValues: field.values.toArray() }),
}, },
{
id: ReducerID.uniqueValues,
name: 'All unique values',
description: 'Returns an array with all unique values',
standard: false,
reduce: (field: Field) => ({
uniqueValues: [...new Set(field.values.toArray())],
}),
},
]); ]);
export function doStandardCalcs(field: Field, ignoreNulls: boolean, nullAsZero: boolean): FieldCalcs { export function doStandardCalcs(field: Field, ignoreNulls: boolean, nullAsZero: boolean): FieldCalcs {