Attached patch adds <@, @>, <<@, and @>> operator symbols for inet datatype to replace <<=, >>=, <<, and >>. <@ and @> symbols are used for containment for all datatypes except inet, particularly on the geometric types, arrays; cube, hstore, intaray, ltree extensions.
<@ and @> symbols are standardised as on version 8.2 by Tom Lane at 2006 . The previous symbols are left in-place but deprecated. The patch does exactly the same for inet datatypes. The << and >> are standard symbols for strictly left of and strictly right of operators. Those operators would also make sense for inet datatypes. If we make this change now; we can remove the symbols, and reuse them for new operators in distant future. The patch removes the recently committed SP-GiST index support for the existing operator symbols to give move reason to the users to use the new symbols. This change will also indirectly deprecate the undocumented non-transparent btree index support that works sometimes for some of the existing operators . The patch includes changes on the regression tests and the documentation. I will add it to 2016-11 Commitfest.  https://www.postgresql.org/message-id/14277.1157304...@sss.pgh.pa.us  https://www.postgresql.org/message-id/389.1042992...@sss.pgh.pa.us
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