```
from employees | keep * | mv_expand first_name
```

throws UnresolvedException:

```
org.elasticsearch.xpack.ql.capabilities.UnresolvedException: Invalid call to attribute on an unresolved object ?*
        at org.elasticsearch.xpack.ql.expression.UnresolvedNamedExpression.toAttribute(UnresolvedNamedExpression.java:44)
        at org.elasticsearch.xpack.ql.expression.Expressions.asAttributes(Expressions.java:40)
        at org.elasticsearch.xpack.ql.plan.logical.Project.output(Project.java:62)
        at org.elasticsearch.xpack.esql.plan.logical.MvExpand.<init>(MvExpand.java:31)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.lambda$visitMvExpandCommand$3(LogicalPlanBuilder.java:154)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.visitCompositeQuery(LogicalPlanBuilder.java:89)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.visitCompositeQuery(LogicalPlanBuilder.java:66)
        at org.elasticsearch.xpack.esql.parser.EsqlBaseParser$CompositeQueryContext.accept(EsqlBaseParser.java:232)
        at org.elasticsearch.xpack.ql.parser.ParserUtils.typedParsing(ParserUtils.java:51)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.plan(LogicalPlanBuilder.java:73)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.visitSingleStatement(LogicalPlanBuilder.java:82)
        at org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.visitSingleStatement(LogicalPlanBuilder.java:66)
        at org.elasticsearch.xpack.esql.parser.EsqlBaseParser$SingleStatementContext.accept(EsqlBaseParser.java:169)
```

The problem is that MV_EXPAND tries to pre-calculate the output too early, when the resolution did not happen yet.
x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/parser/StatementParserTests.java
}
    public void testRowCommandMultivalueHugeInts() {
        assertEquals(
            new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalDoubles(18446744073709551616., 18446744073709551617.)))),
            statement("row c = [18446744073709551616, 18446744073709551617]")
        );
        assertEquals(
            new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalUnsignedLongs("9223372036854775808", "9223372036854775809")))),
            statement("row c = [9223372036854775808, 9223372036854775809]")
        );
    }
    public void testRowCommandMultivalueHugeIntAndNormalInt() {
        assertEquals(
            new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalDoubles(18446744073709551616., 1.0)))),
            statement("row c = [18446744073709551616, 1]")
        );
        assertEquals(
            new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalUnsignedLongs("9223372036854775808", "1")))),
            statement("row c = [9223372036854775808, 1]")
        );
    }
    public void testRowCommandMultivalueDouble() {
        assertEquals(new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalDoubles(1.0, 2.0, -3.4)))), statement("row c = [1.0, 2.0, -3.4]"));
    }
    public void testRowCommandBoolean() {
        assertEquals(new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalBoolean(false)))), statement("row c = false"));
    }
    public void testRowCommandMultivalueBoolean() {
        assertEquals(new Row(EMPTY, List.of(new Alias(EMPTY, "c", literalBooleans(false, true)))), statement("row c = [false, true]"));
    }