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(parent: 25216c9) | patch

Fix more hash index bugs around marking buffers dirty.

Fix more hash index bugs around marking buffers dirty.

In _hash_freeovflpage(), if we're freeing the overflow page that
immediate follows the page to which tuples are being moved (the
confusingly-named "write buffer"), don't forget to mark that
page dirty after updating its hasho_nextblkno.

In _hash_squeezebucket(), it's not necessary to mark the primary
bucket page dirty if there are no overflow pages, because there's
nothing to squeeze in that case.

Amit Kapila, with help from Kuntal Ghosh and Dilip Kumar, after
an initial trouble report by Jeff Janes.

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