### Description

`FROM test | eval x1 = pow(emp_no, 1), x2 = pow(x1, 1), x3 = pow(x2, 2)`

or

`FROM test | eval x1 = substring(ip1, 3), x2 = substring(x1, 2), x3 = substring(x2, 2)`

or

`FROM test | eval x1 = concat(ip1, ip2), x2 = concat(x1, "--"), x3 = concat(x2, "**")`

will fail with 

```
                "type": "verification_exception",
                "reason": "Found 1 problem\nline 1:65: Unknown column [x2], did you mean [x1]?"
```

Spawned from https://github.com/elastic/elasticsearch/issues/99472
x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/AnalyzerTests.java
"geo_shape",
            "int",
            "shape",
            "some.ambiguous",
            "some.ambiguous.normalized",
            "some.ambiguous.one",
            "some.dotted.field",
            "text",
            "unsigned_long",
            "unsupported",
            "x",
            "x.y",
            "x.y.z",
            "x.y.z.v",
            "x.y.z.w",
            "some.ambiguous.two",
            "keyword"
        );
    }
    public void testUnsupportedFieldUsedExplicitly2() {
        assertProjectionWithMapping("""
            from test
            | keep keyword, point
            """, "mapping-multi-field-variation.json", "keyword", "point");
    }
    public void testCantFilterAfterDrop() {
        verifyUnsupported("""
            from test
            | stats c = avg(float) by int
            | drop int