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Michael Paquier e7bff46e50 pageinspect: Fix gist_page_items() with included columns ... Non-leaf pages of GiST indexes contain key attributes, leaf pages contain both key and non-key attributes, and gist_page_items() ignored the handling of non-key attributes. This caused a few problems when using gist_page_items() on a GiST index with INCLUDE: - On a non-leaf page, the function would crash. - On a leaf page, the function would work, but miss to display all the values for included attributes. This commit fixes gist_page_items() to handle such cases in a more appropriate way, and now displays the values of key and non-key attributes for each item separately in a style consistent with what ruleutils.c would generate for the attribute list, depending on the page type dealt with. In a way similar to how a record is displayed, values would be double-quoted for key or non-key attributes if required. ruleutils.c did not provide a routine able to control if non-key attributes should be displayed, so an extended() routine for index definitions is added to work around the leaf and non-leaf page differences. While on it, this commit fixes a third problem related to the amount of data reported for key attributes. The code originally relied on BuildIndexValueDescription() (used for error reports on constraints) that would not print all the data stored in the index but the index opclass's input type, so this limited the amount of information available. This switch makes gist_page_items() much cheaper as there is no need to run ACL checks for each item printed, which is not an issue anyway as superuser rights are required to execute the functions of pageinspect. Opclasses whose data cannot be displayed can rely on gist_page_items_bytea(). The documentation of this function was slightly incorrect for the output results generated on HEAD and v15, so adjust it on these branches. Author: Alexander Lakhin, Michael Paquier Discussion: https://postgr.es/m/17884-cb8c326522977acb@postgresql.org Backpatch-through: 14		2 years ago
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brin.out	Show empty BRIN ranges in brin_page_items	2 years ago
btree.out	Add bt_multi_page_stats() function to contrib/pageinspect.	3 years ago
checksum.out	Add an explicit test to catch changes in checksumming calculations.	6 years ago
checksum_1.out	Add an explicit test to catch changes in checksumming calculations.	6 years ago
gin.out	pageinspect: Fix handling of all-zero pages	3 years ago
gist.out	pageinspect: Fix gist_page_items() with included columns	2 years ago
hash.out	pageinspect: Fix handling of all-zero pages	3 years ago
oldextversions.out	pageinspect: Improve page_header() for pages of 32kB	4 years ago
page.out	Prevent instability in contrib/pageinspect's regression test.	3 years ago