Checks a join's key columns, in order, stopping at the first failing step:
1–2. there are left and right key columns;
3. as many on each side;
4. each pair's columns exist in their inputs and have compatible types,
reported for every pair at once.
Shared with Difference, which joins its inputs the same way.
Checks a join's key columns, in order, stopping at the first failing step: 1–2. there are left and right key columns; 3. as many on each side; 4. each pair's columns exist in their inputs and have compatible types, reported for every pair at once. Shared with Difference, which joins its inputs the same way.