pgsql: Teach CLUSTER to use seqscan-and-sort when it's faster than inde - Mailing list pgsql-committers

Teach CLUSTER to use seqscan-and-sort when it's faster than indexscan.

... or at least, when the planner's cost estimates say it will be faster.

Leonardo Francalanci, reviewed by Itagaki Takahiro and Tom Lane

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=3ba11d3df2115b04171a8eda8e0389e02578d8d0

Modified Files
--------------
doc/src/sgml/ref/cluster.sgml           |   67 +++----
src/backend/commands/cluster.c          |  161 ++++++++++++----
src/backend/optimizer/path/costsize.c   |   45 +++--
src/backend/optimizer/plan/createplan.c |    3 +
src/backend/optimizer/plan/planmain.c   |    3 +-
src/backend/optimizer/plan/planner.c    |  123 ++++++++++++-
src/backend/optimizer/prep/prepunion.c  |    3 +-
src/backend/optimizer/util/pathnode.c   |    2 +
src/backend/optimizer/util/plancat.c    |   86 +++++++--
src/backend/utils/sort/tuplesort.c      |  310 +++++++++++++++++++++++++++++++
src/include/optimizer/cost.h            |    1 +
src/include/optimizer/plancat.h         |    2 +
src/include/optimizer/planner.h         |    2 +
src/include/utils/tuplesort.h           |   43 +++--
14 files changed, 713 insertions(+), 138 deletions(-)