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Mike Hanlon <mike.hanlon@hp.com>
committed
on 20 Mar 15
Support cancel for DDL, update stats, and utils
This change propagates parent query ID to queries created
by DDL, update stats and utils. In… Show more
Support cancel for DDL, update stats, and utils

This change propagates parent query ID to queries created

by DDL, update stats and utils. In this way, preexisting

code sets up child query IDs and the preexisting cancel

broker code in RMS cancels the entire query tree below

the indicated parent. Also added is logic to check for a

canceled parent at the time a child query ID is setup in

Statement::execute, to make the scheme more robust and

to support a common scenario where the parent is compiling

a child query at the time of cancel.

This change also makes ex_root_tcb::cancel to wait for

cancel broker message completion. This fixes a problem where

a query (e.g., CREATE INDEX or DROP INDEX) is prepared,

executed once and gets an error, then re-execed. In this

case, sqlci was not closing the statement after the error.

To improve robustness, after an error we will now wait for

message completion, if needed.

Since we do not yet have transaction protection for DDL,

it will usually be required to cleanup canceled DDL

operations by using the CLEANUP command.

Change-Id: I8940f7108906d5d8d1a8aa4574aacf2b9ffcf0b6

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