46dddf7673
Change the key representation so that values that would exceed 127 bytes are hashed into short strings, and so that the original JSON datatype of each value is recorded in the index. The hashing rule eliminates the major objection to having this opclass be the default for jsonb, namely that it could fail for plausible input data (due to GIN's restrictions on maximum key length). Preserving datatype information doesn't really buy us much right now, but it requires no extra space compared to the previous way, and it might be useful later. Also, change the consistency-checking functions to request recheck for exists (jsonb ? text) and related operators. The original analysis that this is an exactly checkable query was incorrect, since the index does not preserve information about whether a key appears at top level in the indexed JSON object. Add a test case demonstrating the problem. Make some other, mostly cosmetic improvements to the code in jsonb_gin.c as well. catversion bump due to on-disk data format change in jsonb_ops indexes.
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