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Changes In Branch rtree-update-optimization Excluding Merge-Ins

This is equivalent to a diff from b816023ce0 to 6f7cfeff70

2018-05-26
13:55
Add a single sentence of documentation about the virtual table scan flags. No changes to code. (check-in: 27b4fa5dd0 user: drh tags: trunk)
2018-05-25
19:22
Forward port the geopoly extension functions into the r-tree extension, with the idea of creating a new spatial index based on simply polygons. (check-in: 0593aac88a user: drh tags: rtree-geopoly)
14:39
This is an untested proof-of-concept for enhancements to RTree that attempt to use sqlite3_value_nochange() to reduce the amount of work associated with UPDATE operations in cases where either the coordinates or the auxiliary data is unchanged. (Leaf check-in: 6f7cfeff70 user: drh tags: rtree-update-optimization)
09:36
Merge latest trunk changes into this branch. (check-in: 6232519899 user: dan tags: exp-window-functions)
03:46
Add SQLITE_LOCKED_VTAB and SQLITE_CORRUPT_SEQUENCE to sqlite3ErrName(). Also, use SQLITE_CORRUPT_BKPT in one more place. (Leaf check-in: eac8888db3 user: mistachkin tags: errCodes)
2018-05-24
23:51
When doing a one-pass UPDATE or DELETE on virtual tables, close the cursor prior to running VUpdate. This allows one-pass to work on virtual tables that do not allow concurrent reads and writes. Enhance rtree to take advantage of this new capability. (check-in: b816023ce0 user: drh tags: trunk)
22:42
New test case for reading and writing the same rtree concurrently. (check-in: 3ba08e53d5 user: drh tags: trunk)

Changes to ext/rtree/rtree.c.