```
show functions | keep description, *on | mv_expand description
```

```
{
    "error": {
        "root_cause": [
            {
                "type": "unresolved_exception",
                "reason": "Invalid call to dataType on an unresolved object ?description"
            }
        ],
        "type": "unresolved_exception",
        "reason": "Invalid call to dataType on an unresolved object ?description"
    },
    "status": 500
}
```

```
org.elasticsearch.xpack.ql.capabilities.UnresolvedException: Invalid call to dataType on an unresolved object ?description
        at org.elasticsearch.xpack.ql.expression.UnresolvedAttribute.dataType(UnresolvedAttribute.java:90)
        at org.elasticsearch.xpack.esql.analysis.Analyzer$ResolveRefs.resolveMvExpand(Analyzer.java:350)
        at org.elasticsearch.xpack.esql.analysis.Analyzer$ResolveRefs.doRule(Analyzer.java:334)
        at org.elasticsearch.xpack.ql.analyzer.AnalyzerRules$BaseAnalyzerRule.rule(AnalyzerRules.java:120)
        at org.elasticsearch.xpack.ql.analyzer.AnalyzerRules$AnalyzerRule.lambda$apply$0(AnalyzerRules.java:85)
```

It should throw a VerificationException and propagate the unresolved attribute message instead
x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/analysis/Analyzer.java
@Override
        protected LogicalPlan doRule(LogicalPlan plan) {
            final List<Attribute> childrenOutput = new ArrayList<>();
            for (LogicalPlan child : plan.children()) {
                var output = child.output();
                childrenOutput.addAll(output);
            }
            if (plan instanceof Drop d) {
                return resolveDrop(d, childrenOutput);
            }
            if (plan instanceof Rename r) {
                return resolveRename(r, childrenOutput);
            }
            if (plan instanceof Keep p) {
                return resolveKeep(p, childrenOutput);
            }
            if (plan instanceof Eval p) {
                return resolveEval(p, childrenOutput);
            }
            if (plan instanceof Enrich p) {
                return resolveEnrich(p, childrenOutput);
            }
            if (plan instanceof MvExpand p) {
                return resolveMvExpand(p, childrenOutput);
            }
            return plan.transformExpressionsUp(UnresolvedAttribute.class, ua -> maybeResolveAttribute(ua, childrenOutput));
        }
        private LogicalPlan resolveMvExpand(MvExpand p, List<Attribute> childrenOutput) {
            if (p.target() instanceof UnresolvedAttribute ua) {