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Revert "Use Foreign Key relationships to infer multi-column join selectivity".
This commit reverts137805f89
as well as the associated commits015e88942
,5306df283
, and68d704edb
. We found multiple bugs in this feature, and there was concern about possible planner slowdown (though to be fair, exhibiting a very large slowdown proved difficult). The way forward requires a considerable rewrite, which may or may not be possible to accomplish in time for beta2. In my judgment reviewing the rewrite will be easier to accomplish starting from a clean slate, so let's temporarily revert what's there now. This also leaves us in a safe state if it turns out to be necessary to postpone the rewrite to the next development cycle. Discussion: <20160429102531.GA13701@huehner.biz>
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@ -223,7 +223,6 @@ typedef enum NodeTag
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T_PlannerGlobal,
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T_RelOptInfo,
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T_IndexOptInfo,
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T_ForeignKeyOptInfo,
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T_ParamPathInfo,
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T_Path,
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T_IndexPath,
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