[PATCH] Fix leaked hash scans in pg_listening_channels()

[Joel Jacobson]

Hi hackers,

I found a hash scan leak in pg_listening_channels(), introduced by
282b1cde9d.

LISTEN ch;
SELECT pg_listening_channels() LIMIT 1;

The SELECT emits a leak warning in the server logs.

Repeated early exits can exhaust the hash scan limit and cause a
server crash.

Attached patch uses InitMaterializedSRF() to complete the scan
before returning rows, following 257c8231bf.

/Joel

0001-Fix-leaked-hash-scans-in-pg_listening_channels.patch
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