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4cb658af70
This reworks the reloption parsing and build of a couple of index AMs by creating new structures for each index AM's options. This split was already done for BRIN, GIN and GiST (which actually has a fillfactor parameter), but not for hash, B-tree and SPGiST which relied on StdRdOptions due to an overlap with the default option set. This saves a couple of bytes for rd_options in each relcache entry with indexes making use of relation options, and brings more consistency between all index AMs. While on it, add a couple of AssertMacro() calls to make sure that utility macros to grab values of reloptions are used with the expected index AM. Author: Nikolay Shaplov Reviewed-by: Amit Langote, Michael Paquier, Álvaro Herrera, Dent John Discussion: https://postgr.es/m/4127670.gFlpRb6XCm@x200m