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Use elog, not Assert, to report failure to provide an outer snapshot.
As of commit 84f5c2908
, executing SQL commands (via SPI or otherwise)
requires having either an active Portal, or a caller-established
active snapshot. We were simply Assert'ing that that's the case.
But we've now had a couple different reports of people testing
extensions that didn't meet this requirement, and were confused by
the resulting crash. Let's convert the Assert to a test-and-elog,
in hopes of making the issue clearer for extension authors.
Per gripes from Liu Huailing and RekGRpth. Back-patch to v11,
like the prior commit.
Discussion: https://postgr.es/m/OSZPR01MB6215671E3C5956A034A080DFBEEC9@OSZPR01MB6215.jpnprd01.prod.outlook.com
Discussion: https://postgr.es/m/17035-14607d308ac8643c@postgresql.org
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@ -1782,7 +1782,8 @@ EnsurePortalSnapshotExists(void)
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/* Otherwise, we'd better have an active Portal */
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portal = ActivePortal;
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Assert(portal != NULL);
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if (unlikely(portal == NULL))
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elog(ERROR, "cannot execute SQL without an outer snapshot or portal");
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Assert(portal->portalSnapshot == NULL);
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/* Create a new snapshot and make it active */
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