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postgres-lambda-diff

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    Don't call PageGetSpecialPointer() on page until it's been initialized.
    Heikki Linnakangas authored 
    After calling XLogInitBufferForRedo(), the page might be all-zeros if it was
not in page cache already. btree_xlog_unlink_page initialized the page
correctly, but it called PageGetSpecialPointer before initializing it, which
would lead to a corrupt page at WAL replay, if the unlinked page is not in
page cache.

Backpatch to 9.4, the bug came with the rewrite of B-tree page deletion.
    fdf28853
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    user avatar fdf28853
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