"SQL sentence"?
I'm confused by this:
"pg_event_trigger_ddl_commands returns one row for each base command
executed; some commands that are a single SQL sentence may return more
than one row."
What is a "SQL sentence"?
(FWIW, I'm wondering because I was just looking to see why there's no
details for things like altering a column in a table.)
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Jim Nasby wrote:
I'm confused by this:
"pg_event_trigger_ddl_commands returns one row for each base command
executed; some commands that are a single SQL sentence may return more than
one row."What is a "SQL sentence"?
I meant "a single SQL command". The word "sentence" probably just
slipped through. Will fix.
(FWIW, I'm wondering because I was just looking to see why there's no
details for things like altering a column in a table.)
Do you mean you want to have access to the details of the alter table
operations being executed? There's no structured data for that; you
need to write a C function to examine the pg_ddl_command opaque column.
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On 2/17/17 10:19 PM, Alvaro Herrera wrote:
(FWIW, I'm wondering because I was just looking to see why there's no
details for things like altering a column in a table.)Do you mean you want to have access to the details of the alter table
operations being executed? There's no structured data for that; you
need to write a C function to examine the pg_ddl_command opaque column.
Yeah. It doesn't seem unreasonable for a user to want to get at that info.
Could the opaque column be mapped to a composite? I guess that'd be a
bit of a pain due to the union. :/ And I have a suspicion that
alterTable.subcmds is a list of CollectedCommand, making things more fun.
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Jim Nasby wrote:
On 2/17/17 10:19 PM, Alvaro Herrera wrote:
(FWIW, I'm wondering because I was just looking to see why there's no
details for things like altering a column in a table.)Do you mean you want to have access to the details of the alter table
operations being executed? There's no structured data for that; you
need to write a C function to examine the pg_ddl_command opaque column.Yeah. It doesn't seem unreasonable for a user to want to get at that info.
Sure. We have the extension that turned the command into JSON. It's
still an unfinished patch, sadly, even though Alex Shulgin spent a lot
of effort trying to get it finished. It is still missing a nontrivial
amount of work, but within reach ISTM.
Could the opaque column be mapped to a composite?
No. If it could, we would just have added the fields to the output of
the function.
I guess that'd be a bit of
a pain due to the union. :/ And I have a suspicion that alterTable.subcmds
is a list of CollectedCommand, making things more fun.
The AT subcmds have their own struct, so it's even more fun than that.
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On 2/17/17 10:46 PM, Alvaro Herrera wrote:
Jim Nasby wrote:
On 2/17/17 10:19 PM, Alvaro Herrera wrote:
(FWIW, I'm wondering because I was just looking to see why there's no
details for things like altering a column in a table.)Do you mean you want to have access to the details of the alter table
operations being executed? There's no structured data for that; you
need to write a C function to examine the pg_ddl_command opaque column.Yeah. It doesn't seem unreasonable for a user to want to get at that info.
Sure. We have the extension that turned the command into JSON. It's
still an unfinished patch, sadly, even though Alex Shulgin spent a lot
of effort trying to get it finished. It is still missing a nontrivial
amount of work, but within reach ISTM.
I wonder if there's some generic way we could make C structs to JSON.
IIRC there's other places where that ability would be handly.
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Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
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On 2/17/17 10:46 PM, Alvaro Herrera wrote:
Sure. We have the extension that turned the command into JSON. It's
still an unfinished patch, sadly, even though Alex Shulgin spent a lot
of effort trying to get it finished. It is still missing a nontrivial
amount of work, but within reach ISTM.
You're speaking of
/messages/by-id/CACACo5Q_UXYwF117LBhjZ3xaMPyrgqnqE=mXvRhEfjJ51aCfwQ@mail.gmail.com
? Can you reply to that to restart discussion?
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Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
Data in Trouble? Get it in Treble! http://BlueTreble.com
855-TREBLE2 (855-873-2532)
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