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Add page_has_prev(), page_has_next(), page_has_siblings()

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Until now, InnoDB inefficiently compared the aligned fields
FIL_PAGE_PREV, FIL_PAGE_NEXT to the byte-order-agnostic value FIL_NULL.

This is a backport of 32170f8c6d
from MariaDB Server 10.3.
This commit is contained in:
Marko Mäkelä 2019-10-08 18:18:48 +03:00
commit d480d28f4f
13 changed files with 56 additions and 62 deletions
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16
storage/innobase/include/btr0pcur.ic
View file

@ -219,12 +219,8 @@ btr_pcur_is_before_first_in_tree(
ut_ad(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
if (btr_page_get_prev(btr_pcur_get_page(cursor), mtr) != FIL_NULL) {
return(FALSE);
}
return(page_cur_is_before_first(btr_pcur_get_page_cur(cursor)));
return !page_has_prev(btr_pcur_get_page(cursor))
&& page_cur_is_before_first(btr_pcur_get_page_cur(cursor));
}
/*********************************************************//**
@ -240,12 +236,8 @@ btr_pcur_is_after_last_in_tree(
ut_ad(cursor->pos_state == BTR_PCUR_IS_POSITIONED);
ut_ad(cursor->latch_mode != BTR_NO_LATCHES);
if (btr_page_get_next(btr_pcur_get_page(cursor), mtr) != FIL_NULL) {
return(FALSE);
}
return(page_cur_is_after_last(btr_pcur_get_page_cur(cursor)));
return !page_has_next(btr_pcur_get_page(cursor))
&& page_cur_is_after_last(btr_pcur_get_page_cur(cursor));
}
/*********************************************************//**