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Overview
| Comment: | Update ANALYZE test cases to check out the use of histograms for equality constraints. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | stat2-enhancement |
| Files: | files | file ages | folders |
| SHA1: |
c7b59afaf0c0bf85dbaf0a122cc8d65f |
| User & Date: | drh 2011-01-20 20:36:13.223 |
Context
|
2011-01-21
| ||
| 14:37 | Add the ability to use indices when a range contraint is bounded on the lower end by NULL. (check-in: f73a167b43 user: drh tags: stat2-enhancement) | |
|
2011-01-20
| ||
| 20:36 | Update ANALYZE test cases to check out the use of histograms for equality constraints. (check-in: c7b59afaf0 user: drh tags: stat2-enhancement) | |
| 16:52 | Use histogram data to improve the row-count estimates on equality constraints. (check-in: 6bfc5c69eb user: drh tags: stat2-enhancement) | |
Changes
Changes to test/analyze5.test.
| ︙ | ︙ | |||
113 114 115 116 117 118 119 120 121 122 123 124 125 126 |
} {
do_test analyze5-1.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z>? AND z<?) (~%d rows)}} \
$rows]
}
# Change the table values from integer to floating point and then
# repeat the same sequence of tests. We should get the same results.
#
do_test analyze5-2.0 {
db eval {
UPDATE t1 SET z=z+0.0;
| > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 |
} {
do_test analyze5-1.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z>? AND z<?) (~%d rows)}} \
$rows]
}
foreach {testid where rows} {
101 {z=-1} 50
102 {z=0} 400
103 {z=1} 300
104 {z=2} 200
105 {z=3} 100
106 {z=4} 50
107 {z=-10.0} 50
108 {z=0.0} 400
109 {z=1.0} 300
110 {z=2.0} 200
111 {z=3.0} 100
112 {z=4.0} 50
113 {z=1.5} 50
114 {z=2.5} 50
} {
do_test analyze5-1.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z=?) (~%d rows)}} $rows]
}
# For the t1.y column, most entries are known to be zero. So do a
# full table scan for y=0 but use the index for any other constraint on
# y.
#
do_test analyze5-201 {
eqp {SELECT * FROM t1 WHERE y=0}
} {0 0 0 {SCAN TABLE t1 (~100 rows)}}
do_test analyze5-202 {
eqp {SELECT * FROM t1 WHERE y=1}
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1y (y=?) (~50 rows)}}
do_test analyze5-203 {
eqp {SELECT * FROM t1 WHERE y=0.1}
} {0 0 0 {SEARCH TABLE t1 USING INDEX t1y (y=?) (~50 rows)}}
# Change the table values from integer to floating point and then
# repeat the same sequence of tests. We should get the same results.
#
do_test analyze5-2.0 {
db eval {
UPDATE t1 SET z=z+0.0;
|
| ︙ | ︙ | |||
176 177 178 179 180 181 182 183 184 185 186 187 188 189 |
52 {z>=-100 AND z<3.0} 900
} {
do_test analyze5-2.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z>? AND z<?) (~%d rows)}} \
$rows]
}
# Repeat the same range query tests using TEXT columns.
#
do_test analyze5-3.0 {
db eval {
UPDATE t1 SET y=CASE z WHEN 0 THEN 'alpha' WHEN 1 THEN 'bravo'
WHEN 2 THEN 'charlie' ELSE 'delta' END;
| > > > > > > > > > > > > > > > > > > > > > | 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 |
52 {z>=-100 AND z<3.0} 900
} {
do_test analyze5-2.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z>? AND z<?) (~%d rows)}} \
$rows]
}
foreach {testid where rows} {
101 {z=-1} 50
102 {z=0} 400
103 {z=1} 300
104 {z=2} 200
105 {z=3} 100
106 {z=4} 50
107 {z=-10.0} 50
108 {z=0.0} 400
109 {z=1.0} 300
110 {z=2.0} 200
111 {z=3.0} 100
112 {z=4.0} 50
113 {z=1.5} 50
114 {z=2.5} 50
} {
do_test analyze5-2.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1z (z=?) (~%d rows)}} $rows]
}
# Repeat the same range query tests using TEXT columns.
#
do_test analyze5-3.0 {
db eval {
UPDATE t1 SET y=CASE z WHEN 0 THEN 'alpha' WHEN 1 THEN 'bravo'
WHEN 2 THEN 'charlie' ELSE 'delta' END;
|
| ︙ | ︙ | |||
224 225 226 227 228 229 230 231 232 233 |
30 {y>='echo' AND y<x'00'} 50
} {
do_test analyze5-3.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1y (y>? AND y<?) (~%d rows)}} \
$rows]
}
finish_test
| > > > > > > > > > > > > > > | 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 |
30 {y>='echo' AND y<x'00'} 50
} {
do_test analyze5-3.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1y (y>? AND y<?) (~%d rows)}} \
$rows]
}
foreach {testid where rows} {
101 {y=0} 50
102 {y='alpha'} 400
103 {y='bravo'} 300
104 {y='charlie'} 200
105 {y='delta'} 100
106 {y='echo'} 50
107 {y=''} 50
108 {y=x'0102'} 50
} {
do_test analyze5-3.$testid {
eqp "SELECT * FROM t1 WHERE $where"
} [format {0 0 0 {SEARCH TABLE t1 USING INDEX t1y (y=?) (~%d rows)}} $rows]
}
finish_test
|