```
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
expectError(query, "Cannot specify grouping expression [a] as an aggregate");
        }
    }
    public void testInlineStatsWithGroups() {
        assertEquals(
            new InlineStats(
                EMPTY,
                PROCESSING_CMD_INPUT,
                List.of(attribute("c"), attribute("d.e")),
                List.of(
                    new Alias(EMPTY, "b", new UnresolvedFunction(EMPTY, "min", DEFAULT, List.of(attribute("a")))),
                    attribute("c"),
                    attribute("d.e")
                )
            ),
            processingCommand("inlinestats b = min(a) by c, d.e")
        );
    }
    public void testInlineStatsWithoutGroups() {
        assertEquals(
            new InlineStats(
                EMPTY,
                PROCESSING_CMD_INPUT,
                List.of(),
                List.of(
                    new Alias(EMPTY, "min(a)", new UnresolvedFunction(EMPTY, "min", DEFAULT, List.of(attribute("a")))),
                    new Alias(EMPTY, "c", integer(1))
                )
            ),
            processingCommand("inlinestats min(a), c = 1")