Disable external merge source when SQLITE_TEMP_STORE==3. Add documentation

to the OP_OpenSorter opcode. FossilOrigin-Name: 5a690486811379cea40c6ed48b2902f421234832
2011-08-25 18:01:28 +00:00
parent ee140c4d71
commit d7f6e906db
4 changed files with 23 additions and 9 deletions
@@ -366,6 +366,14 @@
 # define SQLITE_TEMP_STORE 1
 #endif

+/*
+** If all temporary storage is in-memory, then omit the external merge-sort
+** logic since it is superfluous.
+*/
+#if SQLITE_TEMP_STORE==3 && !defined(SQLITE_OMIT_MERGE_SORT)
+# define SQLITE_OMIT_MERGE_SORT
+#endif
+
 /*
 ** GCC does not define the offsetof() macro so we'll have to do it
 ** ourselves.