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Make sure that GROUP BY terms select input column names in preference to

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output column names, in compliance with the SQL standard.
Ticket [1c69be2dafc28].

FossilOrigin-Name: f2d175f975cd0be63425424ec322a98fb650019e
This commit is contained in:
drh
2013-08-15 22:40:21 +00:00
parent e35463b312
commit 0af16ab2c2
4 changed files with 74 additions and 16 deletions
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56
test/resolver01.test
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@ -149,4 +149,60 @@ do_execsql_test resolver01-4.1 {
SELECT '3', substr(m,2) AS m FROM t4 ORDER BY lower(m);
} {1 x 1 y 1 z 2 x 2 y 2 z 3 z 3 y 3 x}
##########################################################################
# Test cases for ticket [1c69be2dafc28]: Make sure the GROUP BY binds
# more tightly to the input tables in all cases.
#
# This first case case has been wrong in SQLite for time out of mind.
# For SQLite version 3.7.17 the answer was two rows, which is wrong.
#
do_execsql_test resolver01-5.1 {
CREATE TABLE t5(m CHAR(2));
INSERT INTO t5 VALUES('ax');
INSERT INTO t5 VALUES('bx');
INSERT INTO t5 VALUES('cy');
SELECT count(*), substr(m,2,1) AS m FROM t5 GROUP BY m ORDER BY 1, 2;
} {1 x 1 x 1 y}
# This case is unambiguous and has always been correct.
#
do_execsql_test resolver01-5.2 {
SELECT count(*), substr(m,2,1) AS mx FROM t5 GROUP BY m ORDER BY 1, 2;
} {1 x 1 x 1 y}
# This case is not allowed in standard SQL, but SQLite allows and does
# the sensible thing.
#
do_execsql_test resolver01-5.3 {
SELECT count(*), substr(m,2,1) AS mx FROM t5 GROUP BY mx ORDER BY 1, 2;
} {1 y 2 x}
do_execsql_test resolver01-5.4 {
SELECT count(*), substr(m,2,1) AS mx FROM t5
GROUP BY substr(m,2,1) ORDER BY 1, 2;
} {1 y 2 x}
# These test case weere provided in the 2013-08-14 email from Rob Golsteijn
# that originally reported the problem of ticket [1c69be2dafc28].
#
do_execsql_test resolver01-6.1 {
CREATE TABLE t61(name);
SELECT min(name) FROM t61 GROUP BY lower(name);
} {}
do_execsql_test resolver01-6.2 {
SELECT min(name) AS name FROM t61 GROUP BY lower(name);
} {}
do_execsql_test resolver01-6.3 {
CREATE TABLE t63(name);
INSERT INTO t63 VALUES (NULL);
INSERT INTO t63 VALUES ('abc');
SELECT count(),
NULLIF(name,'abc') AS name
FROM t63
GROUP BY lower(name);
} {1 {} 1 {}}
finish_test