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Parents and children of check-in [a758465e]

Add the sqlite3_memdebug_title_count global variable, used during debugging to count the number of invocations of test_memdebug_settitle. By examining this variable in the debugger after a segfault, one can then set a breakpoint on test_memdebug_settitle that will fire just before the problem. check-in: 27e3ca3e user: drh tags: trunk
Fix a couple of typos in comments. No changes to code. check-in: a758465e user: mistachkin tags: trunk
Query planner heuristic update: When doing a full table scan on a table that has an equality constraint on an unindexed column, do not allow the estimated number of output rows to be greater than half the total number of rows in the table. check-in: 73954f93 user: drh tags: trunk