JDBC adapter throws UnsupportedOperationException if query contains range predicate on columns from sub-query

JDBC adapter throws UnsupportedOperationException if query contains range predicate on columns from sub-query. The query

SELECT CASE WHEN v.g IN (0, 1) THEN 0 ELSE 1 END
FROM (SELECT * FROM "foodmart"."customer") AS c,
 (SELECT 0 AS g) AS v
GROUP BY v.g

contains a range (by virtue of the IN (0, 1)) and throws

java.lang.UnsupportedOperationException
	at org.apache.calcite.rel.rel2sql.SqlImplementor$Result$1.implementor(SqlImplementor.java:1597)
	at org.apache.calcite.rel.rel2sql.SqlImplementor$Context.lambda$toSql$0(SqlImplementor.java:862)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)

The problem is that, in order to simplify a Sarg (see CALCITE-4173), the implementor() is being called in a context where it was not called before. The solution is to implement the SqlImplementor.Context.implementor() method in more sub-classes.