Support for remote DELETE planning and remove restrictions for UPDATE

This adds general support for DELETE query planning in standard planner
in case Postgres-XC planner falls back to standard planner. Now all the
DML plans follow the same logic by adding remoteQuery nodes to plan steps
of ModifyTable plans.
UPDATE has its restrictions removed by adding the CTID value for tuple
selection on remote nodes as a parameter in WHERE clause and in parameter
list associated with extended protocol of remote query.

0 files changed, 0 insertions, 0 deletions