File: distinct.test

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#
# MDEV-4280:
# Assertion `empty_size == empty_size_on_page' failure in ma_blockrec.c or
# ER_NOT_KEYFILE on query with DISTINCT and GROUP BY
#
# This issue was a bug in how we delete row during duplicate removal when
# we use Aria for internal temporary table.
# 

-- source include/have_maria.inc

--disable_warnings
DROP TABLE IF EXISTS t1;
--enable_warnings

CREATE TABLE t1 (a INT, b INT) ENGINE=Aria;
INSERT t1 VALUES (3,2004),(2,2006),(1,2007),(3,2008),(2,2005),(2,2001);
SELECT GROUP_CONCAT(a) FROM t1 GROUP BY b;
SELECT DISTINCT GROUP_CONCAT(a) FROM t1 GROUP BY b;
DROP TABLE t1;

CREATE TABLE t1 (a INT, b VARCHAR(1)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (7,'q'),(2,NULL),(7,'g'),(6,'x');
SELECT DISTINCT MAX( a ) FROM t1 GROUP BY b ORDER BY MD5( b );
DROP TABLE t1;