This file is indexed.

/usr/share/postgresql/9.6/extension/plproxy--2.4.0--2.7.0.sql is in postgresql-9.6-plproxy 2.7-1.

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The actual contents of the file can be viewed below.

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CREATE FUNCTION plproxy_validator (oid)
RETURNS void AS 'plproxy' LANGUAGE C;

CREATE OR REPLACE LANGUAGE plproxy HANDLER plproxy_call_handler VALIDATOR plproxy_validator;