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Optimization for "SELECT min(x) FROM tbl" where "x" is indexed and NOT NULL. This also allows similar queries on NOT NULL virtual table columns to be optimized.

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FossilOrigin-Name: 59726777934e201d94e99ca693f0fda4ebfb1c7883d0258ce542f63f9924c28c
This commit is contained in:
dan
2020-02-27 15:07:16 +00:00
parent 47a60d4518
commit 67e2bb92df
4 changed files with 65 additions and 9 deletions
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test/fts4min.test Normal file
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# 2020 February 27
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#*************************************************************************
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
source $testdir/fts3_common.tcl
set ::testprefix fts4min
# If SQLITE_ENABLE_FTS3 is defined, omit this file.
ifcapable !fts3 {
finish_test
return
}
#------------------------------------------------------------------
do_execsql_test 0.0 {
CREATE TABLE t1(a NOT NULL, b);
CREATE INDEX i1 ON t1(a);
}
do_execsql_test 1.0 {
CREATE VIRTUAL TABLE ft USING fts3(c);
INSERT INTO ft(docid, c) VALUES(22, 'hello world');
INSERT INTO ft(docid, c) VALUES(44, 'hello world');
INSERT INTO ft(docid, c) VALUES(11, 'hello world');
}
do_eqp_test 1.1.1 {
SELECT max(rowid) FROM ft
} {VIRTUAL TABLE INDEX 0:DESC}
do_eqp_test 1.1.2 {
SELECT min(rowid) FROM ft
} {VIRTUAL TABLE INDEX 0:ASC}
do_execsql_test 1.2.1 {
SELECT max(rowid) FROM ft
} {44}
do_execsql_test 1.2.2 {
SELECT min(rowid) FROM ft
} {11}
finish_test