pgsql: Fix unsafe event-trigger coding in ProcessUtility().

Fix unsafe event-trigger coding in ProcessUtility().

We mustn't run any of the event-trigger support code when handling
utility statements like START TRANSACTION or ABORT, because that code
may need to refresh event-trigger cache data, which requires being
inside a valid transaction.  (This mistake explains the consistent
build failures exhibited by the CLOBBER_CACHE_ALWAYS buildfarm members,
as well as some irreproducible failures on other members.)

The least messy fix seems to be to break standard_ProcessUtility into two
functions, one that handles all the statements not supported by event
triggers, and one that contains the event-trigger support code and handles
the statements that are supported by event triggers.

This change also fixes several inconsistencies, such as four cases where
support had been installed for "ddl_event_start" but not "ddl_event_end"
triggers, plus the fact that InvokeDDLCommandEventTriggersIfSupported()
paid no mind to isCompleteQuery.

Dimitri Fontaine and Tom Lane

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5525e6c40bbda351a19b48317eba0f79aa32e447

Modified Files
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src/backend/tcop/utility.c | 1195 +++++++++++++++++++++-----------------------
1 files changed, 569 insertions(+), 626 deletions(-)