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values-table.ts
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values-table.ts
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import { nil, QueryError, Schema, SchemaField } from '../interfaces.ts';
import { IValue, setId, _ISchema, _IType, _Transaction } from '../interfaces-private.ts';
import { Expr } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';
import { ReadOnlyTable } from './readonly-table.ts';
import { buildValue } from '../parser/expression-builder.ts';
import { Types } from '../datatypes/index.ts';
import { withSelection, buildCtx } from '../parser/context.ts';
let cnt = 0;
export class ValuesTable extends ReadOnlyTable {
private symbol = Symbol();
_schema!: Schema;
private assignments!: (IValue<any> | "default")[][];
entropy(t: _Transaction): number {
return 0;
}
enumerate(t: _Transaction): Iterable<any> {
const ret = this.assignments.map(vals => {
const ret = { [this.symbol]: true } as any;
setId(ret, 'vtbl' + (++cnt));
for (let i = 0; i < vals.length; i++) {
const v = vals[i];
ret[this._schema.fields[i].name] = v === 'default'
? null
: v.get({}, t);
}
return ret;
});
return ret;
}
hasItem(value: any, t: _Transaction): boolean {
return !!value[this.symbol];
}
constructor(alias: string, items: Expr[][], columnNames: string[] | nil, acceptDefault?: boolean) {
super(buildCtx().schema);
withSelection(buildCtx().schema.dualTable.selection, () => {
const len = new Set(items.map(x => x.length));
if (len.size !== 1) {
throw new QueryError('VALUES lists must all be the same length');
}
if (columnNames && columnNames.length > items[0].length) {
throw new QueryError(`table "${alias}" has ${items[0].length} columns available but ${columnNames.length} columns specified`);
}
type V = IValue | 'default';
let builtVals: V[][] = items.map(vals => vals.map(e => {
if (acceptDefault && e.type === 'default') {
return 'default';
}
return buildValue(e);
}));
const types = items[0].map((_, i) => {
return preferedType(builtVals.map(x => {
const v = x[i];
return v === 'default'
? null
: v.type;
}))
});
this._schema = {
name: alias,
fields: types.map<SchemaField>((type, i) => {
return {
type: type ?? Types.default,
name: columnNames?.[i] ?? `column${i + 1}`,
}
})
};
this.assignments = builtVals.map(vals => vals.map((v, i) => v === 'default' ? v : v.cast(types[i]!)))
});
}
}
function preferedType(types: (_IType | null)[]) {
return types.reduce((a, b) => {
if (!a) {
return b;
}
if (!b) {
return a;
}
const ret = a.prefer(b);
if (!ret) {
throw new QueryError('Incompatible value types');
}
return ret;
}, types[0]);
}