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import { _ISelection, _IIndex, _ITable, getId, _Transaction, _Explainer, _SelectExplanation, Stats } from '../interfaces-private.ts';import { FilterBase } from './transform-base.ts';

export class OrFilter<T = any> extends FilterBase<T> {
    entropy(t: _Transaction) {        return this.left.entropy(t) + this.right.entropy(t);    }
    hasItem(value: T, t: _Transaction): boolean {        return this.left.hasItem(value, t) || this.right.hasItem(value, t);    }
    constructor(private left: _ISelection<T>, private right: _ISelection<T>) {        super(left);        if (left.columns !== right.columns) { //  istanbul ignore next            throw new Error('Column set mismatch');        }    }
    stats(t: _Transaction): Stats | null {        return null;    }
    *enumerate(t: _Transaction): Iterable<T> {        const yielded = new Set<string>();        for (const item of this.left.enumerate(t)) {            yield item;            yielded.add(getId(item));        }        for (const item of this.right.enumerate(t)) {            const id = getId(item);            if (!yielded.has(id)) {                yield item;            }        }    }


    explain(e: _Explainer): _SelectExplanation {        return {            id: e.idFor(this),            _: 'union',            union: [                this.left.explain(e),                this.right.explain(e),            ],        };    }}