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Up to now, it's been safe for plpgsql to store TOAST pointers in its variables because the ActiveSnapshot for whatever query called the plpgsql function will surely protect such TOAST values from being vacuumed away, even if the owning table rows are committed dead. With the introduction of procedures, that assumption is no longer good in "non atomic" executions of plpgsql code. We adopt the slightly brute-force solution of detoasting all TOAST pointers at the time they are stored into variables, if we're in a non-atomic context, just in case the owning row goes away. Some care is needed to avoid long-term memory leaks, since plpgsql tends to run with CurrentMemoryContext pointing to its call-lifespan context, but we shouldn't assume that no memory is leaked by heap_tuple_fetch_attr. In plpgsql proper, we can do the detoasting work in the "eval_mcontext". Most of the code thrashing here is due to the need to add this capability to expandedrecord.c as well as plpgsql proper. In expandedrecord.c, we can't assume that the caller's context is short-lived, so make use of the short-term sub-context that was already invented for checking domain constraints. In view of this repurposing, it seems good to rename that variable and associated code from "domain_check_cxt" to "short_term_cxt". Peter Eisentraut and Tom Lane Discussion: https://postgr.es/m/5AC06865.9050005@anastigmatix.net |
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| authentication | ||
| examples | ||
| isolation | ||
| kerberos | ||
| ldap | ||
| locale | ||
| mb | ||
| modules | ||
| perl | ||
| recovery | ||
| regress | ||
| ssl | ||
| subscription | ||
| thread | ||
| Makefile | ||
| README | ||
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure