The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/10/sql-vacuum.html Description:
Hi, I think the documentation should mention one particular aspect of b-tree partial indexes: Say we have a row that satisfy a partial index's predicate. That row will be referenced by the partial index. Say now that this row gets updated in such a way that the updated row no longer satisfies the predicate. The entry of that row in the index (more precisely, the row previous version) is still kept in a leaf node of the b-tree until a VACUUM is issued on the index's table. So in short, an update on the index's predicate column results in no direct change on the index whereas a change on an index column is reflected as soon as the change has been committed. I think the documentation should mention this specificity in some way since it can have impact in terms of index design. I couldn't find a mention of this behavior anywhere in the doc. Kind regards, Chaouki Dhib
