May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Extending GiST
Of course, it is also possible to come up with your own operator classes. The following strategies are supported:
|
Operation |
Strategy number |
|
Strictly left of |
1 |
|
Does not extend to right of |
2 |
|
Overlaps |
3 |
|
Does not extend to left of |
4 |
|
Strictly right of |
5 |
|
Same |
6 |
|
Contains |
7 |
|
Contained by |
8 |
|
Does not extend above |
9 |
|
Strictly below |
10 |
|
Strictly above |
11 |
|
Does not extend below |
12 |
If you want to write operator classes for GiST, a couple of support functions have to be provided. In the case of a B-tree, there is only the same function - GiST indexes provide a lot more:
|
Function |
Description |
Support function number |
|
consistent |
The functions determine ... |
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