[development] db_rewrite_sql

[Ashraf Amayreh]

Looking at this function which raps db_query calls and allows modules to
alter the query, I was wondering how a hook_db_rewrite_sql is supposed to
distinguish the queries that it wants to alter from the queries that it
wants to leave alone?

Only way I can think of is to do a string match on large parts of the
original query, but isn't this quite messy, or am I missing something? Could
someone please shed the light on this issue?
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