Method opt

basex-core/src/main/java/org/basex/query/func/map/MapItems.java:26–34

(final CompileContext cc)

  }

  @Override
  protected Expr opt(final CompileContext cc) {
    final Expr map = arg(0);
    if(map.seqType().type instanceof final MapType mt) {
      final SeqType vt = mt.valueType();
      exprType.assign(vt.with(Occ.ZERO_OR_MORE), vt.one() ? map.structSize() : -1);
    }
    return this;
  }
}