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4e4f7b9fcc
Currently, PQsslAttributeNames() returns the same list of attribute names regardless of its conn parameter. This patch changes it to have behavior parallel to what 80a05679d installed for PQsslAttribute: you get OpenSSL's attributes if conn is NULL or is an SSL-encrypted connection, or an empty list if conn is a non-encrypted connection. The point of this is to have sensible connection-dependent behavior in case we ever support multiple SSL libraries. The behavior for NULL can be defined as "the attributes for the default SSL library", parallel to what PQsslAttribute(NULL, "library") does. Since this is mostly just future-proofing, no back-patch. Discussion: https://postgr.es/m/17625-fc47c78b7d71b534@postgresql.org