Sphinx UDF example

Hi

Many databases and search engines allow you to customize your queries using your own so called “user defined functions” or UDF. Sphinx and Manticore are not exceptions. There’s a long section in documentation about this – https://docs.manticoresearch.com/latest/html/extending.html#udfs-user-defined-functions

Here I want to give just a quick example of how you can make a UDF which enables some fucntionality which can be really useful in some cases, but missing out of the box – sleep() function.

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