```
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/test/java/org/elasticsearch/xpack/esql/analysis/AnalyzerTests.java
}
    public void testUnsupportedParentField() {
        verifyUnsupported(
            """
                from test
                | keep text, text.keyword
                """,
            "Found 1 problem\n" + "line 2:14: Unknown column [text.keyword], did you mean any of [text.wildcard, text.raw]?",
            "mapping-multi-field.json"
        );
    }
    public void testUnsupportedParentFieldAndItsSubField() {
        assertProjectionWithMapping("""
            from test
            | keep text, text.english
            """, "mapping-multi-field.json", "text", "text.english");
    }
    public void testUnsupportedDeepHierarchy() {
        assertProjectionWithMapping("""
            from test
            | keep x.y.z.w, x.y.z, x.y, x
            """, "mapping-multi-field-with-nested.json", "x.y.z.w", "x.y.z", "x.y", "x");
    }
    /**
     * Here x.y.z.v is of type "keyword" but its parent is of unsupported type "foobar".
     */
    public void testUnsupportedValidFieldTypeInDeepHierarchy() {
        assertProjectionWithMapping("""
            from test
            | keep x.y.z.v