Auxiliary column support (asg017#123)

* initial pass at PARTITION KEY support.

* Initial pass, allow auxiliary columns on vec0 virtual tables

* update TODO

* unit tests

* gha this PR branch

* fixup tests

* doc internal

* fix tests, KNN/rowids in

* define SQLITE_INDEX_CONSTRAINT_OFFSET

* whoops

* update tests, syrupy, use uv

* un ignore pyproject.toml

* dot

* tests/

* type error?

* win: .exe, update error name

* try fix macos python, paren around expr?

* win bash?

* dbg :(

* explicit error

* op

* dbg win

* win ./tests/.venv/Scripts/python.exe

* block UPDATEs on partition key values for now

* test this branch

* accidentally removved "partition key type mistmatch" block during merge

* typo ugh

* bruv

* start aux snapshots

* drop aux shadow table on destroy

* enforce column types

* block WHERE constraints on auxiliary columns in KNN queries

* support delete

* support UPDATE on auxiliary columns

Author: asg017

.github/workflows/test.yaml

@@ -4,6 +4,7 @@ on:
     branches:
       - main
       - partition-by
+      - auxiliary
 permissions:
   contents: read
 jobs:

TODO

@@ -3,3 +3,11 @@
 - [ ] UPDATE on partition key values
   - remove previous row from chunk, insert into new one?
 - [ ] properly sqlite3_vtab_nochange / sqlite3_value_nochange handling
+
+# auxiliary columns
+
+- later:
+  - NOT NULL?
+  - perf: INSERT stmt should be cached on vec0_vtab
+  - perf: LEFT JOIN aux table to rowids query in vec0_cursor for rowid/point
+    stmts, to avoid N lookup queries