Hi,
Le 13 août 2015 9:51 PM, "Jeff Janes" <jeff.janes@gmail.com> a écrit :
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> I am looking for an extension or a technique that will allow me to intercept a query by the exact query text, and replace that query with a different one.
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> The context is running a third-party app which issues queries I have no control over. I'd like to intercept a specific query (which has no bind parameters) and either replace the query text with a different text which, for example, swaps out an "in list" clause to instead be an "exists (subquery)".
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> Or just wrap the query in a "set enable_* =off;" or "set work_mem=*;" before and a reset of it after.
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> Is there anything out there like this? This would be for 9.4.
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> I'm willing to put the query text, and its replacement, directly into the extension source code and compile it, but of course something more flexible would be ideal.
>
I know of no extension that does this, even if the idea is rather interesting. I don't remember if there is any hook that would allow such a thing. But that is definitely interesting.
--
Guillaume.