jinxing64 opened a new pull request #1388: [CALCITE-3262] Refine doc of 
SubstitutionVisitor.java
URL: https://github.com/apache/calcite/pull/1388
 
 
   Current doc of `SubstitutionVisitor.java` says the supported core relational 
operators are `@link org.apache.calcite.rel.logical.LogicalTableScan`, and so 
on.
   But with `convertTableAccess=true` 
(https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L5636),
 it's a `EnumerableTableScan` under `MutableScan`, which is inconsistent with 
the doc. 
   And what's more, `MutableRels` and `SubstitutionVisitor` supporting scope 
doesn't limit to be `org.apache.calcite.rel.logical.LogicalXXX`.
   So I think it might make sense to update/refine the doc to say that the 
supported core relational operators are
   ```
    * {@link org.apache.calcite.rel.core.TableScan},
    * {@link org.apache.calcite.rel.core.Filter},
    * {@link org.apache.calcite.rel.core.Project},
    * {@link org.apache.calcite.rel.core.Join},
    * {@link org.apache.calcite.rel.core.Union},
    * {@link org.apache.calcite.rel.core.Aggregate}.</p>
   ```

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