[pgpool-hackers: 4479] Comment to force query cache

[Tatsuo Ishii]

There is a feature request from a user.

https://github.com/pgpool/pgpool2/issues/56

That is, to allow to use SQL comment to force to create a query cache
entry. We already have /*NO QUERY CACHE*/ comment, which
unconditionally disabling query cache. The request is just opposite. I
think this is a useful feature because in some cases there's no
workaround to create query cache. I proposed a workaround to use view,
but it has its own downside. See the issue for more details.

So my proposal is to support a new comment "/*FORCE QUERY CACHE*/". If
a query starts with the comment, the query will be cached
unconditionally. Patch attached. Comments and suggestions are welcome.

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
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