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import { _IStatementExecutor, _Transaction, StatementResult, GLOBAL_VARS, QueryError } from '../interfaces-private.ts';import { ShowStatement } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { locOf } from './exec-utils.ts';
export class ShowExecutor implements _IStatementExecutor {    constructor(private statement: ShowStatement) { }
    execute(t: _Transaction): StatementResult {        const p = this.statement;        const got = t.getMap(GLOBAL_VARS);        if (!got.has(p.variable.name)) {            throw new QueryError(`unrecognized configuration parameter "${p.variable.name}"`);        }        return {            state: t,            result: {                rows: [{ [p.variable.name]: got.get(p.variable.name) }],                rowCount: 1,                command: 'SHOW',                fields: [],                location: locOf(p),            },        }    }}