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author | Bruce Momjian <bruce@momjian.us> | 2005-12-17 19:03:24 +0000 |
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committer | Bruce Momjian <bruce@momjian.us> | 2005-12-17 19:03:24 +0000 |
commit | 25af534ea134cff88342e5e270e6a213a1b7edb4 (patch) | |
tree | 61af2c05ee12567d9634ab1ae2becb95a0193036 /src/tutorial/funcs.c | |
parent | 3282b6338b6ae3303c36aae213ee6d8686419421 (diff) | |
download | postgresql-25af534ea134cff88342e5e270e6a213a1b7edb4.tar.gz postgresql-25af534ea134cff88342e5e270e6a213a1b7edb4.zip |
Remove item:
< * Allow star join optimizations
<
< While our bitmap scan allows multiple indexes to be joined to get
< to heap rows, a star joins allows multiple dimension _tables_ to
< be joined to index into a larger main fact table. The join is
< usually performed by either creating a cartesian product of all
< the dimmension tables and doing a single join on that product or
< using subselects to create bitmaps of each dimmension table match
< and merge the bitmaps to perform the join on the fact table. Some
< of these algorithms might be patented.
Diffstat (limited to 'src/tutorial/funcs.c')
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