agavra opened a new pull request, #9497:
URL: https://github.com/apache/pinot/pull/9497
Adds functionality to be able to call `QueryPlan#debugString()` to see an
`EXPLAIN`-like string. Here are some examples:
`SELECT * FROM b ORDER BY col1, col2 DESC LIMIT 3`:
```
MAIL_RECEIVE
MAIL_SEND
SORT (LIMIT 3)
MAIL_RECEIVE
MAIL_SEND
TABLE SCAN (b)
```
`SELECT * FROM a JOIN b ON a.col1 = b.col1 JOIN c ON a.col3 = c.col3`:
```
MAIL_RECEIVE
MAIL_SEND
JOIN
MAIL_RECEIVE
MAIL_SEND
JOIN
MAIL_RECEIVE
MAIL_SEND
TABLE SCAN (a)
MAIL_RECEIVE
MAIL_SEND
TABLE SCAN (b)
MAIL_RECEIVE
MAIL_SEND
TABLE SCAN (c)
```
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