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Fix a performance problem in the FTS4 auxiliary functions triggered by an OR clause in the full-text query.

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FossilOrigin-Name: fa0f2f0e3e79ae653118b901e1cca7725dfaf249
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dan
2013-09-30 18:14:45 +00:00
parent 92054fefcd
commit 1f03e609ff
4 changed files with 129 additions and 30 deletions
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63
test/fts3snippet.test
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@ -16,6 +16,7 @@
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix fts3snippet
# If SQLITE_ENABLE_FTS3 is not defined, omit this file.
ifcapable !fts3 { finish_test ; return }
@ -138,7 +139,7 @@ foreach {DO_MALLOC_TEST enc} {
# Set variable $T to the test name prefix for this iteration of the loop.
#
set T "fts3snippet-$enc"
set T "fts3snippet-1.$enc"
##########################################################################
# Test the offset function.
@ -459,5 +460,65 @@ foreach {DO_MALLOC_TEST enc} {
} {0 blob}
}
#-------------------------------------------------------------------------
# Test an interaction between the snippet() function and OR clauses.
#
do_execsql_test 2.1 {
CREATE VIRTUAL TABLE t2 USING fts4;
INSERT INTO t2 VALUES('one two three four five');
INSERT INTO t2 VALUES('two three four five one');
INSERT INTO t2 VALUES('three four five one two');
INSERT INTO t2 VALUES('four five one two three');
INSERT INTO t2 VALUES('five one two three four');
}
do_execsql_test 2.2 {
SELECT snippet(t2, '[', ']') FROM t2 WHERE t2 MATCH 'one OR (four AND six)'
} {
{[one] two three [four] five}
{two three [four] five [one]}
{three [four] five [one] two}
{[four] five [one] two three}
{five [one] two three [four]}
}
do_execsql_test 2.3 {
SELECT snippet(t2, '[', ']') FROM t2
WHERE t2 MATCH 'one OR (four AND six)'
ORDER BY docid DESC
} {
{five [one] two three [four]}
{[four] five [one] two three}
{three [four] five [one] two}
{two three [four] five [one]}
{[one] two three [four] five}
}
do_execsql_test 2.4 {
INSERT INTO t2 VALUES('six');
}
do_execsql_test 2.5 {
SELECT snippet(t2, '[', ']') FROM t2 WHERE t2 MATCH 'one OR (four AND six)'
} {
{[one] two three [four] five}
{two three [four] five [one]}
{three [four] five [one] two}
{[four] five [one] two three}
{five [one] two three [four]}
}
do_execsql_test 2.6 {
SELECT snippet(t2, '[', ']') FROM t2
WHERE t2 MATCH 'one OR (four AND six)'
ORDER BY docid DESC
} {
{five [one] two three [four]}
{[four] five [one] two three}
{three [four] five [one] two}
{two three [four] five [one]}
{[one] two three [four] five}
}
set sqlite_fts3_enable_parentheses 0
finish_test