Hi, Alexander! I found and fixed a couple of naming issues that came to v4 from earlier patches. Also, I added initialization of requiredMatchedByPrecheck in case of first page.
Please see patch v5. One more doubt about naming. Calling function _bt_checkkeys(IndexScanDesc scan, IndexTuple tuple, int tupnatts, ScanDirection dir, bool *continuescan, bool requiredMatchedByPrecheck) as (void) _bt_checkkeys(scan, itup, indnatts, dir, &requiredMatchedByPrecheck, false); looks little bit misleading because of coincidence of names of 5 and 6 arguments.
0001-Skip-checking-of-scan-keys-required-for-direction-v4.patch
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