`ArrayScanNode` formatting does not support all join types

[ohaibbq]

Currently only a cross join is used, so clauses that use INNER JOIN or LEFT OUTER JOIN produce incorrect results.

WITH produce AS (select 'lettuce' AS item UNION ALL SELECT 'banana')
SELECT item, in_stock_items is not null AS item_in_stock FROM produce
LEFT OUTER JOIN unnest(['lettuce']) in_stock_items ON in_stock_items = item;

item	item_in_stock
lettuce	true
banana	false

WITH produce AS (select 'lettuce' AS item UNION ALL SELECT 'banana')
SELECT item, in_stock_items is not null AS item_in_stock FROM produce
INNER JOIN unnest(['lettuce']) in_stock_items ON in_stock_items = item;

item	item_in_stock
lettuce	true