feat: add option to support DBSTAT

.github/workflows/go.yaml

@@ -44,7 +44,7 @@ jobs:
         run: go-acc . -- -race -v -tags "libsqlite3"
 
       - name: 'Tags: full'
-        run: go-acc . -- -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_column_metadata sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_math_functions sqlite_os_trace sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_unlock_notify sqlite_userauth sqlite_vacuum_incr sqlite_vtable"
+        run: go-acc . -- -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_column_metadata sqlite_dbstat_vtab sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_math_functions sqlite_os_trace sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_unlock_notify sqlite_userauth sqlite_vacuum_incr sqlite_vtable"
 
       - name: 'Tags: vacuum'
         run: go-acc . -- -race -v -tags "sqlite_vacuum_full"
@@ -99,7 +99,7 @@ jobs:
       - name: 'Tags: full'
         run: |
           echo 'skip this test'
-          echo go build -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_column_metadata sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_math_functions sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_unlock_notify sqlite_userauth sqlite_vacuum_incr sqlite_vtable"
+          echo go build -race -v -tags "sqlite_allow_uri_authority sqlite_app_armor sqlite_column_metadata sqlite_dbstat_vtab sqlite_foreign_keys sqlite_fts5 sqlite_icu sqlite_introspect sqlite_json sqlite_math_functions sqlite_preupdate_hook sqlite_secure_delete sqlite_see sqlite_stat4 sqlite_trace sqlite_unlock_notify sqlite_userauth sqlite_vacuum_incr sqlite_vtable"
         shell: msys2 {0}
 
       - name: 'Tags: vacuum'

README.md

@@ -164,6 +164,7 @@ go build -tags "icu json1 fts5 secure_delete"
 | Additional Statistics | sqlite_stat4 | This option adds additional logic to the ANALYZE command and to the query planner that can help SQLite to chose a better query plan under certain situations. The ANALYZE command is enhanced to collect histogram data from all columns of every index and store that data in the sqlite_stat4 table.<br><br>The query planner will then use the histogram data to help it make better index choices. The downside of this compile-time option is that it violates the query planner stability guarantee making it more difficult to ensure consistent performance in mass-produced applications.<br><br>SQLITE_ENABLE_STAT4 is an enhancement of SQLITE_ENABLE_STAT3. STAT3 only recorded histogram data for the left-most column of each index whereas the STAT4 enhancement records histogram data from all columns of each index.<br><br>The SQLITE_ENABLE_STAT3 compile-time option is a no-op and is ignored if the SQLITE_ENABLE_STAT4 compile-time option is used |
 | Allow URI Authority | sqlite_allow_uri_authority | URI filenames normally throws an error if the authority section is not either empty or "localhost".<br><br>However, if SQLite is compiled with the SQLITE_ALLOW_URI_AUTHORITY compile-time option, then the URI is converted into a Uniform Naming Convention (UNC) filename and passed down to the underlying operating system that way |
 | App Armor | sqlite_app_armor | When defined, this C-preprocessor macro activates extra code that attempts to detect misuse of the SQLite API, such as passing in NULL pointers to required parameters or using objects after they have been destroyed. <br><br>App Armor is not available under `Windows`. |
+| DBSTAT Virtual Table | sqlite_dbstat_vtab | This option adds support to [DBSTAT virtual table](https://www.sqlite.org/dbstat.html) that returns information about the amount of disk space used to store the content of an SQLite database.
 | Disable Load Extensions | sqlite_omit_load_extension | Loading of external extensions is enabled by default.<br><br>To disable extension loading add the build tag `sqlite_omit_load_extension`. |
 | Enable Serialization with `libsqlite3` | sqlite_serialize | Serialization and deserialization of a SQLite database is available by default, unless the build tag `libsqlite3` is set.<br><br>To enable this functionality even if `libsqlite3` is set, add the build tag `sqlite_serialize`. |
 | Foreign Keys | sqlite_foreign_keys | This macro determines whether enforcement of foreign key constraints is enabled or disabled by default for new database connections.<br><br>Each database connection can always turn enforcement of foreign key constraints on and off and run-time using the foreign_keys pragma.<br><br>Enforcement of foreign key constraints is normally off by default, but if this compile-time parameter is set to 1, enforcement of foreign key constraints will be on by default | 

sqlite3_opt_dbstat_vtab.go

@@ -0,0 +1,9 @@
+// +build sqlite_dbstat_vtab dbstat_vtab
+
+package sqlite3
+
+/*
+#cgo CFLAGS: -DSQLITE_ENABLE_DBSTAT_VTAB=1
+#cgo LDFLAGS: -lm
+*/
+import "C"