Update TODO for LIKE/ESCAPE.

doc/TODO.detail/like

-From zalman@netcom.com Tue Mar 16 18:01:18 1999
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-From: Zalman Stern <zalman@netcom.com>
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-Subject: Re: [SQL] How match percent sign in SELECT using LIKE?
-To: maillist@candle.pha.pa.us (Bruce Momjian)
-Date: Tue, 16 Mar 1999 14:55:33 -0800 (PST)
-Cc: zalman@netcom.com, herouth@oumail.openu.ac.il, pgsql-sql@postgreSQL.org
-In-Reply-To: <199903162226.RAA20904@candle.pha.pa.us> from "Bruce Momjian" at Mar 16, 99 05:26:09 pm
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-Bruce Momjian wrote:
-> That is also an excellent idea.  Just convert their escape to \ inside
-> the parser.  Of course, they still have to use \\ to get a \, as in any
-> string.  Great idea.
-
-You can even make it fully compliant if you want. (There are of course
-backward compatibility problems. I'm not sure what the Postgres policy is
-on this.)
-
-- If the escape character is backslash, do nothing.
-- Otherwise, turn all backslashes in the string to double backslashes.
-- If the escape character is not set, stop here.
-- Turn all occurences of the escape character into a backslash except
-  where the escape character is doubled, where it should be made into a
-  single occurence.
-(Optionally, if "\n" is just an 'n' character, you can handle double
-occurences of the escape character by turning the first one into a
-backslash.)
-
-Probably the best bet for PostgreSQL programmers is to always code Like
-clauses with an ESCAPE '\' (or however its written).
-
-I really wish they'd chosen a character other than underscore for the
-"match one" wildcard... Is there any standard practice for seperating words
-in table names?
-
--Z-
-