3 Commits

Author	SHA1	Message	Date
Tom Lane	4db485e75b	Put back a backwards-compatible version of sampling support functions. ... Commit 83e176ec18 removed the longstanding support functions for block sampling without any consideration of the impact this would have on third-party FDWs. The new API is not notably more functional for FDWs than the old, so forcing them to change doesn't seem like a good thing. We can provide the old API as a wrapper (more or less) around the new one for a minimal amount of extra code.	2015-05-18 18:34:37 -04:00
Simon Riggs	f6d208d6e5	TABLESAMPLE, SQL Standard and extensible ... Add a TABLESAMPLE clause to SELECT statements that allows user to specify random BERNOULLI sampling or block level SYSTEM sampling. Implementation allows for extensible sampling functions to be written, using a standard API. Basic version follows SQLStandard exactly. Usable concrete use cases for the sampling API follow in later commits. Petr Jelinek Reviewed by Michael Paquier and Simon Riggs	2015-05-15 14:37:10 -04:00
Simon Riggs	83e176ec18	Separate block sampling functions ... Refactoring ahead of tablesample patch Requested and reviewed by Michael Paquier Petr Jelinek	2015-05-15 04:02:54 +02:00