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import { _ISchema, _Transaction, _ISequence, _IStatementExecutor, _IStatement, asSeq } from '../../interfaces-private.ts';import { AlterSequenceStatement } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { ExecHelper } from '../exec-utils.ts';import { ignore } from '../../utils.ts';
export class AlterSequence extends ExecHelper implements _IStatementExecutor {    private seq: _ISequence | null;

    constructor({ schema }: _IStatement, private p: AlterSequenceStatement) {        super(p);
        this.seq = asSeq(schema.getObject(p.name, {            nullIfNotFound: p.ifExists,        }));        if (!this.seq) {            ignore(this.p);        }    }
    execute(t: _Transaction) {        // commit pending data before making changes        //  (because the index sequence creation does support further rollbacks)        t = t.fullCommit();
        // alter the sequence        this.seq?.alter(t, this.p.change);
        // new implicit transaction        t = t.fork();
        return this.noData(t, 'ALTER');    }}