Horton

Re: UPDATE of partition key

Amit Khandekar <amitdkhan.pg@gmail.com>

View thread View on postgr.es
From: Amit Khandekar <amitdkhan.pg@gmail.com>
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>, Etsuro Fujita <fujita.etsuro@lab.ntt.co.jp>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-09-19T07:45:38Z
Lists: pgsql-hackers 
On 18 September 2017 at 20:45, Dilip Kumar <dilipbalaut@gmail.com> wrote:
> Please find few more comments.
>
> + * in which they appear in the PartitionDesc. Also, extract the
> + * partition key columns of the root partitioned table. Those of the
> + * child partitions would be collected during recursive expansion.
> */
> + pull_child_partition_columns(&all_part_cols, oldrelation, oldrelation);
> expand_partitioned_rtentry(root, rte, rti, oldrelation, oldrc,
>   lockmode, &root->append_rel_list,
> +   &all_part_cols,
>
> pcinfo->all_part_cols is only used in case of update, I think we can
> call pull_child_partition_columns
> only if rte has updateCols?
>
> @@ -2029,6 +2034,7 @@ typedef struct PartitionedChildRelInfo
>
> Index parent_relid;
> List   *child_rels;
> + Bitmapset  *all_part_cols;
> } PartitionedChildRelInfo;
>
> I might be missing something, but do we really need to store
> all_part_cols inside the
> PartitionedChildRelInfo,  can't we call pull_child_partition_columns
> directly inside
> inheritance_planner whenever we realize that RTE has some updateCols
> and we want to
> check the overlap?

One thing  we will have to do extra is : Open and close the
partitioned rels again. The idea was that we collect the bitmap
*while* we are already expanding through the tree and the rel is open.
Will check if this is feasible.

>
> +extern void partition_walker_init(PartitionWalker *walker, Relation rel);
> +extern Relation partition_walker_next(PartitionWalker *walker,
> +  Relation *parent);
> +
>
> I don't see these functions are used anywhere?
>
> +typedef struct PartitionWalker
> +{
> + List   *rels_list;
> + ListCell   *cur_cell;
> +} PartitionWalker;
> +
>
> Same as above

Yes, this was left out from the earlier implementation. Will have this
removed in the next updated patch.


-- 
Thanks,
-Amit Khandekar
EnterpriseDB Corporation
The Postgres Database Company

Commits

  1. Avoid referencing off the end of subplan_partition_offsets.

  2. Allow UPDATE to move rows between partitions.

  3. Remove useless lookup of root partitioned rel in ExecInitModifyTable().

  4. Factor error generation out of ExecPartitionCheck.

  5. Minor preparatory refactoring for UPDATE row movement.

  6. Simplify and encapsulate tuple routing support code.

  7. Avoid coercing a whole-row variable that is already coerced.

  8. Use ResultRelInfo ** rather than ResultRelInfo * for tuple routing.

  9. Make RelationGetPartitionDispatchInfo expand depth-first.

  10. Expand partitioned tables in PartDesc order.

  11. Use a real RT index when setting up partition tuple routing.

  12. Fix transition tables for partition/inheritance.

  13. Fix confusion about number of subplans in partitioned INSERT setup.

  14. Prevent BEFORE triggers from violating partitioning constraints.

  15. Fire per-statement triggers on partitioned tables.

  16. Fix reporting of violations in ExecConstraints, again.

  17. Don't scan partitioned tables.

  18. Allow FDWs to push down quals without breaking EvalPlanQual rechecks.