Development
Notation in Query Plans
In query plans, the [hash join](https://en.wikipedia.org/wiki/Hash_join) operators adhere to the following convention:
the _probe side_ of the join is the left operand, while the _build side_ is the right operand.  
Join operators in the query plan show the join type used:
* Inner joins are denoted as `INNER`.
* Left outer joins and right outer joins are denoted as `LEFT` and `RIGHT`, respectively.
* Full outer joins are denoted as `FULL`.