We fall back to local execution if we cannot establish any more
connections to local node. However, we should not do that for the
commands that we don't know how to execute locally (or we know we
shouldn't execute locally). To fix that, we take localExecutionSupported
take into account in CanFailoverPlacementExecutionToLocalExecution too.
Moreover, we also prompt a more accurate hint message to inform user
about whether the execution is failed because local execution is
disabled by them, or because local execution wasn't possible for given
command.
multi_log_hook() hook is called by EmitErrorReport() when emitting the
ereport either to frontend or to the server logs. And some callers of
EmitErrorReport() (e.g.: errfinish()) seems to assume that string fields
of given ErrorData object needs to be freed. For this reason, we copy the
message into heap here.
I don't think we have faced with such a problem before but it seems worth
fixing as it is theoretically possible due to the reasoning above.
Drop ruleutils copied for triggers & statistics
While reading trigger related parts of our code-base, realized that
we actually don't need to copy & paste underlying worker functions
from pg/ruleutils.c since higher level functions for those two are
anyway exposed as SQL callables, so we can delete more than ~1k lines
of code from our ruleutils_x.c files.
BEGIN/COMMIT transaction block or in a UDF calling another UDF.
(2) Prohibit/Limit the delegated function not to do a 2PC (or any work on a
remote connection).
(3) Have a safety net to ensure the (2) i.e. we should block the connections
from the delegated procedure or make sure that no 2PC happens on the node.
(4) Such delegated functions are restricted to use only the distributed argument
value.
Note: To limit the scope of the project we are considering only Functions(not
procedures) for the initial work.
DESCRIPTION: Introduce a new flag "force_delegation" in create_distributed_function(),
which will allow a function to be delegated in an explicit transaction block.
Fixes#3265
Once the function is delegated to the worker, on that node during the planning
distributed_planner()
TryToDelegateFunctionCall()
CheckDelegatedFunctionExecution()
EnableInForceDelegatedFuncExecution()
Save the distribution argument (Constant)
ExecutorStart()
CitusBeginScan()
IsShardKeyValueAllowed()
Ensure to not use non-distribution argument.
ExecutorRun()
AdaptiveExecutor()
StartDistributedExecution()
EnsureNoRemoteExecutionFromWorkers()
Ensure all the shards are local to the node in the remoteTaskList.
NonPushableInsertSelectExecScan()
InitializeCopyShardState()
EnsureNoRemoteExecutionFromWorkers()
Ensure all the shards are local to the node in the placementList.
This also fixes a minor issue: Properly handle expressions+parameters in distribution arguments