sqlite: add option to enable additional query optimizations (stat3)

Signed-off-by: Sven Neumann <s.neumann@raumfeld.com>
Reviewed-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sqlite/Config.in

@@ -14,3 +14,11 @@ config BR2_PACKAGE_SQLITE_READLINE
 	help
 	  Enable command-line editing. This requires ncurses and readline.
 
+config BR2_PACKAGE_SQLITE_STAT3
+	bool "Additional query optimizations (stat3)"
+	depends on BR2_PACKAGE_SQLITE
+	help
+	  Adds additional logic to the ANALYZE command and to the query
+	  planner that can help SQLite to choose a better query plan under
+	  certain situations.
+

package/sqlite/sqlite.mk

@@ -16,6 +16,10 @@ ifneq ($(BR2_LARGEFILE),y)
 SQLITE_CFLAGS += -DSQLITE_DISABLE_LFS
 endif
 
+ifeq ($(BR2_PACKAGE_SQLITE_STAT3),y)
+SQLITE_CFLAGS += -DSQLITE_ENABLE_STAT3
+endif
+
 SQLITE_CONF_ENV = CFLAGS="$(TARGET_CFLAGS) $(SQLITE_CFLAGS)"
 
 SQLITE_CONF_OPT = \