opt: extend hints to ZigZag joins #35814
Description
We may want to offer some customers the ability to use zigzag joins for experimental purposes. If we do, we may want to force the selection of that join via hints. We can't currently do that:
root@localhost:26257/tpch> set experimental_enable_zigzag_join=true;
SET
Time: 593.804µs
root@localhost:26257/tpch> show experimental_enable_zigzag_join;
experimental_enable_zigzag_join
+---------------------------------+
on
(1 row)
Time: 1.00337ms
Then try with a hint:
root@localhost:26257/tpch> explain SELECT count(*) FROM lineitem INNER zigzag JOIN supplier ON l_suppkey = s_suppkey;
invalid syntax: statement ignored: syntax error at or near "zigzag"
DETAIL: source SQL:
explain SELECT count(*) FROM lineitem INNER zigzag JOIN supplier ON l_suppkey = s_suppkey
^
HINT: try \h <SOURCE>
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