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Experimental implementation of FILTER clause for aggregate functions.

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dan
2019-07-02 11:56:47 +00:00
parent 00a6153faf
commit 6ba7ab0d25
12 changed files with 342 additions and 45 deletions
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test/filter1.test Normal file
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# 2018 May 8
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix filter1
ifcapable !windowfunc {
finish_test
return
}
do_execsql_test 1.0 {
CREATE TABLE t1(a);
CREATE INDEX i1 ON t1(a);
INSERT INTO t1 VALUES(1), (2), (3), (4), (5), (6), (7), (8), (9);
}
do_execsql_test 1.1 { SELECT sum(a) FROM t1; } 45
do_execsql_test 1.2 { SELECT sum(a) FILTER( WHERE a<5 ) FROM t1; } 10
do_execsql_test 1.3 {
SELECT sum(a) FILTER( WHERE a>9 ),
sum(a) FILTER( WHERE a>8 ),
sum(a) FILTER( WHERE a>7 ),
sum(a) FILTER( WHERE a>6 ),
sum(a) FILTER( WHERE a>5 ),
sum(a) FILTER( WHERE a>4 ),
sum(a) FILTER( WHERE a>3 ),
sum(a) FILTER( WHERE a>2 ),
sum(a) FILTER( WHERE a>1 ),
sum(a) FILTER( WHERE a>0 )
FROM t1;
} {{} 9 17 24 30 35 39 42 44 45}
do_execsql_test 1.4 {
SELECT max(a) FILTER (WHERE (a % 2)==0) FROM t1
} {8}
do_execsql_test 1.5 {
SELECT min(a) FILTER (WHERE a>4) FROM t1
} {5}
do_execsql_test 1.6 {
SELECT count(*) FILTER (WHERE a!=5) FROM t1
} {8}
do_execsql_test 1.6 {
SELECT min(a) FILTER (WHERE a>3) FROM t1 GROUP BY (a%2) ORDER BY 1;
} {4 5}
#-------------------------------------------------------------------------
# Test some errors:
#
# .1 FILTER on a non-aggregate function,
# .2 Window function in FILTER clause,
# .3 Aggregate function in FILTER clause,
#
reset_db
do_execsql_test 2.0 {
CREATE TABLE t1(a);
INSERT INTO t1 VALUES(1), (2), (3), (4), (5), (6), (7), (8), (9);
}
do_catchsql_test 2.1 {
SELECT upper(a) FILTER (WHERE a=1) FROM t1
} {1 {filter clause may not be used with non-aggregate upper()}}
do_catchsql_test 2.2 {
SELECT sum(a) FILTER (WHERE 1 - max(a) OVER () > 0) FROM t1
} {1 {misuse of window function max()}}
do_catchsql_test 2.3 {
SELECT sum(a) FILTER (WHERE 1 - count(a)) FROM t1
} {1 {misuse of aggregate: count()}}
finish_test