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Andres Freund 73c954d248 tableam: sample scan. ... This moves sample scan support to below tableam. It's not optional as there is, in contrast to e.g. bitmap heap scans, no alternative way to perform tablesample queries. If an AM can't deal with the block based API, it will have to throw an ERROR. The tableam callbacks for this are block based, but given the current TsmRoutine interface, that seems to be required. The new interface doesn't require TsmRoutines to perform visibility checks anymore - that requires the TsmRoutine to know details about the AM, which we want to avoid. To continue to allow taking the returned number of tuples account SampleScanState now has a donetuples field (which previously e.g. existed in SystemRowsSamplerData), which is only incremented after the visibility check succeeds. Author: Andres Freund Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de		6 years ago
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expected	Redesign tablesample method API, and do extensive code review.	10 years ago
sql	Redesign tablesample method API, and do extensive code review.	10 years ago
.gitignore	contrib/tsm_system_rows	10 years ago
Makefile	Redesign tablesample method API, and do extensive code review.	10 years ago
tsm_system_rows--1.0.sql	Redesign tablesample method API, and do extensive code review.	10 years ago
tsm_system_rows.c	tableam: sample scan.	6 years ago
tsm_system_rows.control	Redesign tablesample method API, and do extensive code review.	10 years ago