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Don't count NULL values in cardinalty for MyISAM tables.

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Free row buffer cache after each query for MyISAM tables.
Added table join option FORCE INDEX
Fixed core dump bug when connecting with hostname that could not be resolved.
This commit is contained in:
monty@mashka.mysql.fi
2003-01-09 02:19:14 +02:00
parent 23c13c4539
commit 3c08da957e
17 changed files with 207 additions and 52 deletions
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4
sql/opt_range.cc
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@ -605,12 +605,14 @@ int SQL_SELECT::test_quick_select(key_map keys_to_use, table_map prev_tables,
records++; /* purecov: inspected */
scan_time=(double) records / TIME_FOR_COMPARE+1;
read_time=(double) head->file->scan_time()+ scan_time + 1.0;
if (head->force_index)
scan_time= read_time= DBL_MAX;
if (limit < records)
read_time=(double) records+scan_time+1; // Force to use index
else if (read_time <= 2.0 && !force_quick_range)
DBUG_RETURN(0); /* No need for quick select */
DBUG_PRINT("info",("Time to scan table: %ld",(long) read_time));
DBUG_PRINT("info",("Time to scan table: %g", read_time));
keys_to_use&=head->keys_in_use_for_query;
if (keys_to_use)