Re: [HACKERS] Declarative partitioning - another take

On 2016/12/16 17:02, Amit Langote wrote:
> [PATCH 2/7] Change how RelationGetPartitionQual() and related code works
> 
> Since we always want to recurse, ie, include the parent's partition
> constraint (if any), get rid of the argument recurse.
> 
> Refactor out the code doing the mapping of attnos of Vars in partition
> constraint expressions (parent attnos -> child attnos).  Move it to a
> separate function map_partition_varattnos() and call it from appropriate
> places.  It previously used to be done in get_qual_from_partbound(),
> which would lead to wrong results in certain multi-level partitioning
> cases, as the mapping would be done for immediate parent-partition pairs.
> Now in generate_partition_qual() which is the workhorse of
> RelationGetPartitionQual(), we first generate the full expression
> (considering all levels of partitioning) and then do the mapping from the
> root parent to a leaf partition.  It is also possible to generate
> partition constraint up to certain non-leaf level and then apply the
> same to leaf partitions of that sub-tree after suitable substitution
> of varattnos using the new map_partition_varattnos() directly.
> 
> Bug fix: ATExecAttachPartition() failed to do the mapping when attaching
> a partitioned table as partition. It is possible for the partitions of
> such table to have different attributes from the table being attached
> and/or the target partitioned table.

Oops, PATCH 2/7 attached with the previous email had a bug in it, whereby
map_partition_varattnos() was not applied to the partition constraint
expressions returned directly from the relcache (rd_partcheck) copy.
Attaching just the updated (only) PATCH 2 which fixes that.  Patches
1,3,4,5,6,7/7 from the previous email [1] are fine.  Sorry about that.

Thanks,
Amit

[1]
https://www.postgresql.org/message-id/c820c0eb-6935-6f84-8c6a-785fdff130c1@lab.ntt.co.jp

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