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Overview
Comment: | Clarification of a sentence in the R-Tree documentation. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
96728cbc1323dbc74b3502d5f745487e |
User & Date: | drh 2017-02-08 18:10:25.724 |
Context
2017-02-09
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19:48 | Final adjustments to the change log before starting release tests. (check-in: b6f0b02c8c user: drh tags: trunk) | |
2017-02-08
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18:10 | Clarification of a sentence in the R-Tree documentation. (check-in: 96728cbc13 user: drh tags: trunk) | |
2017-02-04
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16:22 | Update the preformance spreadsheet (check-in: 49eb6735bf user: drh tags: trunk) | |
Changes
Changes to pages/rtree.in.
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347 348 349 350 351 352 353 | virtual tables store 32-bit integers and only integer values are used for internal computations. <tcl>hd_fragment {customquery} {custom r-tree queries}</tcl> <h1>Custom R-Tree Queries</h1> <p>By using standard SQL expressions in the WHERE clause of a SELECT query, | | | | 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 | virtual tables store 32-bit integers and only integer values are used for internal computations. <tcl>hd_fragment {customquery} {custom r-tree queries}</tcl> <h1>Custom R-Tree Queries</h1> <p>By using standard SQL expressions in the WHERE clause of a SELECT query, a programmer can query for all R*Tree entries that intersect with or are contained within a particular bounding-box. Custom R*Tree queries, using the MATCH operator in the WHERE clause of a SELECT, allow the programmer to query for the set of R*Tree entries that intersect any arbitrary region or shape, not just a box. This capability is useful, for example, in computing the subset of objects in the R*Tree that are visible from a camera positioned in 3-D space. |
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