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authorAlvaro Herrera <alvherre@alvh.no-ip.org>2018-04-06 16:23:04 -0300
committerAlvaro Herrera <alvherre@alvh.no-ip.org>2018-04-06 16:44:05 -0300
commit9fdb675fc5d2de825414e05939727de8b120ae81 (patch)
tree0e599089ca1e82dac50b61675f1cdf2d53bb0b49 /src/backend/executor/execMain.c
parent11523e860f8fe29f9142fb63c44e01cd0d5e7375 (diff)
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Faster partition pruning
Add a new module backend/partitioning/partprune.c, implementing a more sophisticated algorithm for partition pruning. The new module uses each partition's "boundinfo" for pruning instead of constraint exclusion, based on an idea proposed by Robert Haas of a "pruning program": a list of steps generated from the query quals which are run iteratively to obtain a list of partitions that must be scanned in order to satisfy those quals. At present, this targets planner-time partition pruning, but there exist further patches to apply partition pruning at execution time as well. This commit also moves some definitions from include/catalog/partition.h to a new file include/partitioning/partbounds.h, in an attempt to rationalize partitioning related code. Authors: Amit Langote, David Rowley, Dilip Kumar Reviewers: Robert Haas, Kyotaro Horiguchi, Ashutosh Bapat, Jesper Pedersen. Discussion: https://postgr.es/m/098b9c71-1915-1a2a-8d52-1a7a50ce79e8@lab.ntt.co.jp
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