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Project "Postgres-XC".

The branch, master has been updated
       via  23220741845f72669e5bd4bb5825d8818fb16223 (commit)
      from  9ce38d3bf64c17155a0ca283c56987b7ecd9e218 (commit)


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http://postgres-xc.git.sourceforge.net/git/gitweb.cgi?p=postgres-xc/postgres-xc;a=commitdiff;h=23220741845f72669e5bd4bb5825d8818fb16223

commit 23220741845f72669e5bd4bb5825d8818fb16223
Author: Michael Paquier <mi...@ot...>
Date:   Mon Oct 22 10:23:40 2012 +0900

    Index expressions shippability analysis for distribution columns
    
    This commit strengthens determination analysis of unique index expressions
    shippability for value-distributed tables.
    
    For example, in the case of a cluster with 2 Datanodes:
    CREATE TABLE aa (a int) DISTRIBUTE BY HASH(a);
    CREATE UNIQUE INDEX aap ON (abs(a));
    INSERT INTO aa (2); -- To Datanode 1
    INSERT INTO aa (-2); -- To Datanode 2
    The index uniqueness is not ensured here even if the index expression constains
    only the distribution column of parent relation. Such expressions are not
    shippable, and as XC does not support yet global constraints such index creation
    is simply blocked.
    
    Also, if the table has its data located on a single node, its index uniqueness
    can be evaluated safely in all the cases, a condition is added to treat that
    case.

M	src/backend/optimizer/util/pgxcship.c
M	src/test/regress/expected/xc_constraints.out
M	src/test/regress/sql/xc_constraints.sql

-----------------------------------------------------------------------

Summary of changes:
 src/backend/optimizer/util/pgxcship.c        |   56 +++++++++++---------------
 src/test/regress/expected/xc_constraints.out |    3 +-
 src/test/regress/sql/xc_constraints.sql      |    2 +-
 3 files changed, 26 insertions(+), 35 deletions(-)


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