```
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
        public LogicalPlan apply(LogicalPlan plan) {
            return plan.transformExpressionsUp(BinaryComparison.class, PromoteStringsInDateComparisons::promote);
        }
        private static Expression promote(BinaryComparison cmp) {
            if (cmp.resolved() == false) {
                return cmp;
            }
            var left = cmp.left();
            var right = cmp.right();
            boolean modified = false;
            if (left.dataType() == DATETIME) {
                if (right.dataType() == KEYWORD && right.foldable()) {
                    right = stringToDate(right);
                    modified = true;
                }
            } else {
                if (right.dataType() == DATETIME) {
                    if (left.dataType() == KEYWORD && left.foldable()) {
                        left = stringToDate(left);
                        modified = true;
                    }
                }
            }
            return modified ? cmp.replaceChildren(List.of(left, right)) : cmp;