agavra commented on PR #9895:
URL: https://github.com/apache/pinot/pull/9895#issuecomment-1335927107
@61yao instead of an optimization rule it should be implemented as a
rewriter. I tested this and it works:
```java
public class RightJoinRewriter extends SqlShuttle {
public SqlNode visit(SqlCall call) {
if (call instanceof SqlJoin) {
SqlJoin join = (SqlJoin) call;
if (join.getJoinType() == JoinType.RIGHT) {
return super.visit(new SqlJoin(
call.getParserPosition(),
join.getRight(),
join.isNaturalNode(),
SqlLiteral.createSymbol(JoinType.LEFT,
join.getJoinTypeNode().getParserPosition()),
join.getLeft(),
join.getConditionTypeNode(),
join.getCondition()));
}
}
return super.visit(call);
}
}
```
And then I modified `CalciteSqlParser#extractSqlNodeAndOptions` to apply
this rewriter:
```java
return new SqlNodeAndOptions(statementNode.accept(new
RightJoinRewriter()), sqlType, options);
```
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