### Description

`stats x = count`  throws error `unknown column [count]` which is confusing since stats does not allow aliasing for existing columns but only points to aggregate functions.
Hence why the message should be `incorrect function declaration count, you forgot to add the parantheisis`. 
Same approach when dealing with a typo: `stats x = cont(*)` - `Unkown aggregate function cont - did you mean count()?`

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/analysis/Verifier.java
p.forEachExpression(BinaryComparison.class, bc -> {
            Failure f = validateBinaryComparison(bc);
            if (f != null) {
                failures.add(f);
            }
        });
    }
    private void gatherMetrics(LogicalPlan plan) {
        BitSet b = new BitSet(FeatureMetric.values().length);
        plan.forEachDown(p -> {
            if (p instanceof Dissect) {
                b.set(DISSECT.ordinal());
            } else if (p instanceof Eval) {
                b.set(EVAL.ordinal());
            } else if (p instanceof Grok) {
                b.set(GROK.ordinal());
            } else if (p instanceof Limit) {
                b.set(LIMIT.ordinal());
            } else if (p instanceof OrderBy) {
                b.set(SORT.ordinal());
            } else if (p instanceof Aggregate) {
                b.set(STATS.ordinal());
            } else if (p instanceof Filter) {
                b.set(WHERE.ordinal());
            }
        });
        for (int i = b.nextSetBit(0); i >= 0; i = b.nextSetBit(i + 1)) {
            metrics.inc(FeatureMetric.values()[i]);
        }
    }