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Add the SQLITE_DBCONFIG_ENABLE_QPSG option to activate the query planner

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stability guarantee.  This involves refactoring the sqlite3.flags bitvector
to carve out a free bit to use.

FossilOrigin-Name: 7076e8283ebae1b45a5d85d9538b49b6da399d38c3c6935de100f948f814f6a9
This commit is contained in:
drh
2017-06-26 13:57:49 +00:00
parent a22dd3860a
commit 169dd928c5
15 changed files with 160 additions and 65 deletions
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46
test/like.test
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@@ -160,6 +160,7 @@ ifcapable !like_opt {
#
proc queryplan {sql} {
set ::sqlite_sort_count 0
db cache flush
set data [execsql $sql]
if {$::sqlite_sort_count} {set x sort} {set x nosort}
lappend data $x
@@ -196,7 +197,7 @@ do_test like-3.2 {
# With an index on t1.x and case sensitivity on, optimize completely.
#
do_test like-3.3 {
do_test like-3.3.100 {
set sqlite_like_count 0
execsql {
PRAGMA case_sensitive_like=on;
@@ -206,10 +207,51 @@ do_test like-3.3 {
SELECT x FROM t1 WHERE x LIKE 'abc%' ORDER BY 1;
}
} {abc abcd nosort {} i1}
do_test like-3.4 {
do_test like-3.3.101 {
set sqlite_like_count
} 0
# The like optimization works even when the pattern is a bound parameter
#
do_test like-3.3.102 {
set sqlite_like_count 0
unset -nocomplain ::likepat
set ::likepat abc%
queryplan {
SELECT x FROM t1 WHERE x LIKE $::likepat ORDER BY 1;
}
} {abc abcd nosort {} i1}
do_test like-3.3.103 {
set sqlite_like_count
} 0
# Except, the like optimization does not work for bound parameters if
# the query planner stability guarantee is active.
#
do_test like-3.3.104 {
set sqlite_like_count 0
sqlite3_db_config db QPSG 1
queryplan {
SELECT x FROM t1 WHERE x LIKE $::likepat ORDER BY 1;
}
} {abc abcd nosort {} i1}
do_test like-3.3.105 {
set sqlite_like_count
} 12
# The query planner stability guarantee does not disrupt explicit patterns
#
do_test like-3.3.105 {
set sqlite_like_count 0
queryplan {
SELECT x FROM t1 WHERE x LIKE 'abc%' ORDER BY 1;
}
} {abc abcd nosort {} i1}
do_test like-3.3.106 {
set sqlite_like_count
} 0
sqlite3_db_config db QPSG 0
# The LIKE optimization still works when the RHS is a string with no
# wildcard. Ticket [e090183531fc2747]
#