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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Add an extra column to a table in analyze9.test to give the planner a little more reason to select an index.
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SHA1: 1b95544f84bf83c28cc15f6d0690fdf8a6bb3941
User & Date: dan 2014-04-28 12:08:23
Context
2014-04-28
15:11
Update unordered.test to take into account for the fact that SQLite now prefers a full-table scan over a non-covering index scan that visits a large percentage of the table rows. check-in: 20f468df user: dan tags: experimental-costs
12:08
Add an extra column to a table in analyze9.test to give the planner a little more reason to select an index. check-in: 1b95544f user: dan tags: experimental-costs
10:00
Update test script analyze3.test to account for the fact that SQLite now prefers a full-table scan over a non-covering index scan that visits a large percentage of the table rows. check-in: 35f46a55 user: dan tags: experimental-costs
Changes
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Changes to test/analyze9.test.

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#-------------------------------------------------------------------------
# Check that affinities are taken into account when using stat4 data to
# estimate the number of rows scanned by a rowid constraint.
#
drop_all_tables
do_test 13.1 {
  execsql {
    CREATE TABLE t1(a, b, c);
    CREATE INDEX i1 ON t1(a);
    CREATE INDEX i2 ON t1(b, c);
  }
  for {set i 0} {$i<100} {incr i} {
    if {$i %2} {set a abc} else {set a def}
    execsql { INSERT INTO t1(rowid, a, b, c) VALUES($i, $a, $i, $i) }
  }







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#-------------------------------------------------------------------------
# Check that affinities are taken into account when using stat4 data to
# estimate the number of rows scanned by a rowid constraint.
#
drop_all_tables
do_test 13.1 {
  execsql {
    CREATE TABLE t1(a, b, c, d);
    CREATE INDEX i1 ON t1(a);
    CREATE INDEX i2 ON t1(b, c);
  }
  for {set i 0} {$i<100} {incr i} {
    if {$i %2} {set a abc} else {set a def}
    execsql { INSERT INTO t1(rowid, a, b, c) VALUES($i, $a, $i, $i) }
  }