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Alvaro Herrera b488c580ae Allow on-the-fly capture of DDL event details ... This feature lets user code inspect and take action on DDL events. Whenever a ddl_command_end event trigger is installed, DDL actions executed are saved to a list which can be inspected during execution of a function attached to ddl_command_end. The set-returning function pg_event_trigger_ddl_commands can be used to list actions so captured; it returns data about the type of command executed, as well as the affected object. This is sufficient for many uses of this feature. For the cases where it is not, we also provide a "command" column of a new pseudo-type pg_ddl_command, which is a pointer to a C structure that can be accessed by C code. The struct contains all the info necessary to completely inspect and even reconstruct the executed command. There is no actual deparse code here; that's expected to come later. What we have is enough infrastructure that the deparsing can be done in an external extension. The intention is that we will add some deparsing code in a later release, as an in-core extension. A new test module is included. It's probably insufficient as is, but it should be sufficient as a starting point for a more complete and future-proof approach. Authors: Álvaro Herrera, with some help from Andres Freund, Ian Barwick, Abhijit Menon-Sen. Reviews by Andres Freund, Robert Haas, Amit Kapila, Michael Paquier, Craig Ringer, David Steele. Additional input from Chris Browne, Dimitri Fontaine, Stephen Frost, Petr Jelínek, Tom Lane, Jim Nasby, Steven Singer, Pavel Stěhule. Based on original work by Dimitri Fontaine, though I didn't use his code. Discussion: https://www.postgresql.org/message-id/m2txrsdzxa.fsf@2ndQuadrant.fr https://www.postgresql.org/message-id/20131108153322.GU5809@eldon.alvh.no-ip.org https://www.postgresql.org/message-id/20150215044814.GL3391@alvh.no-ip.org		11 years ago
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examples	Fix up .gitignore and cleanup actions in some src/test/ subdirectories.	11 years ago
isolation	Add support for INSERT ... ON CONFLICT DO NOTHING/UPDATE.	11 years ago
locale	Fix up .gitignore and cleanup actions in some src/test/ subdirectories.	11 years ago
mb	Lots of doc corrections.	14 years ago
modules	Allow on-the-fly capture of DDL event details	11 years ago
perl	Fix previous commit for TAP test suites in VPATH builds.	11 years ago
regress	Fix incorrect checking of deferred exclusion constraint after a HOT update.	11 years ago
ssl	Make SSL regression test suite more portable by avoiding cp.	11 years ago
thread	Fix up .gitignore and cleanup actions in some src/test/ subdirectories.	11 years ago
Makefile	Fix up .gitignore and cleanup actions in some src/test/ subdirectories.	11 years ago