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+# 2001 September 15
+#
+# 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.  The
+# focus of this file is testing aggregate functions and the
+# GROUP BY and HAVING clauses of SELECT statements.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Build some test data
+#
+execsql {
+  CREATE TABLE t1(x int, y int);
+  BEGIN;
+}
+for {set i 1} {$i<32} {incr i} {
+  for {set j 0} {(1<<$j)<$i} {incr j} {}
+  execsql "INSERT INTO t1 VALUES([expr {32-$i}],[expr {10-$j}])"
+}
+execsql {
+  COMMIT
+}
+
+do_test select5-1.0 {
+  execsql {SELECT DISTINCT y FROM t1 ORDER BY y}
+} {5 6 7 8 9 10}
+
+# Sort by an aggregate function.
+#
+do_test select5-1.1 {
+  execsql {SELECT y, count(*) FROM t1 GROUP BY y ORDER BY y}
+} {5 15 6 8 7 4 8 2 9 1 10 1}
+do_test select5-1.2 {
+  execsql {SELECT y, count(*) FROM t1 GROUP BY y ORDER BY count(*), y}
+} {9 1 10 1 8 2 7 4 6 8 5 15}
+do_test select5-1.3 {
+  execsql {SELECT count(*), y FROM t1 GROUP BY y ORDER BY count(*), y}
+} {1 9 1 10 2 8 4 7 8 6 15 5}
+
+# Some error messages associated with aggregates and GROUP BY
+#
+do_test select5-2.1.1 {
+  catchsql {
+    SELECT y, count(*) FROM t1 GROUP BY z ORDER BY y
+  }
+} {1 {no such column: z}}
+do_test select5-2.1.2 {
+  catchsql {
+    SELECT y, count(*) FROM t1 GROUP BY temp.t1.y ORDER BY y
+  }
+} {1 {no such column: temp.t1.y}}
+do_test select5-2.2 {
+  set v [catch {execsql {
+    SELECT y, count(*) FROM t1 GROUP BY z(y) ORDER BY y
+  }} msg]
+  lappend v $msg
+} {1 {no such function: z}}
+do_test select5-2.3 {
+  set v [catch {execsql {
+    SELECT y, count(*) FROM t1 GROUP BY y HAVING count(*)<3 ORDER BY y
+  }} msg]
+  lappend v $msg
+} {0 {8 2 9 1 10 1}}
+do_test select5-2.4 {
+  set v [catch {execsql {
+    SELECT y, count(*) FROM t1 GROUP BY y HAVING z(y)<3 ORDER BY y
+  }} msg]
+  lappend v $msg
+} {1 {no such function: z}}
+do_test select5-2.5 {
+  set v [catch {execsql {
+    SELECT y, count(*) FROM t1 GROUP BY y HAVING count(*)<z ORDER BY y
+  }} msg]
+  lappend v $msg
+} {1 {no such column: z}}
+
+# Get the Agg function to rehash in vdbe.c
+#
+do_test select5-3.1 {
+  execsql {
+    SELECT x, count(*), avg(y) FROM t1 GROUP BY x HAVING x<4 ORDER BY x
+  }
+} {1 1 5.0 2 1 5.0 3 1 5.0}
+
+# Run various aggregate functions when the count is zero.
+#
+do_test select5-4.1 {
+  execsql {
+    SELECT avg(x) FROM t1 WHERE x>100
+  }
+} {{}}
+do_test select5-4.2 {
+  execsql {
+    SELECT count(x) FROM t1 WHERE x>100
+  }
+} {0}
+do_test select5-4.3 {
+  execsql {
+    SELECT min(x) FROM t1 WHERE x>100
+  }
+} {{}}
+do_test select5-4.4 {
+  execsql {
+    SELECT max(x) FROM t1 WHERE x>100
+  }
+} {{}}
+do_test select5-4.5 {
+  execsql {
+    SELECT sum(x) FROM t1 WHERE x>100
+  }
+} {{}}
+
+# Some tests for queries with a GROUP BY clause but no aggregate functions.
+#
+# Note: The query in test cases 5.1 through 5.5 are not legal SQL. So if the 
+# implementation changes in the future and it returns different results,
+# this is not such a big deal.
+#
+do_test select5-5.1 {
+  execsql {
+    CREATE TABLE t2(a, b, c);
+    INSERT INTO t2 VALUES(1, 2, 3);
+    INSERT INTO t2 VALUES(1, 4, 5);
+    INSERT INTO t2 VALUES(6, 4, 7);
+    CREATE INDEX t2_idx ON t2(a);
+  } 
+} {}
+do_test select5-5.2 {
+  execsql {
+    SELECT a FROM t2 GROUP BY a;
+  } 
+} {1 6}
+do_test select5-5.3 {
+  execsql {
+    SELECT a FROM t2 WHERE a>2 GROUP BY a;
+  } 
+} {6}
+do_test select5-5.4 {
+  execsql {
+    SELECT a, b FROM t2 GROUP BY a, b;
+  } 
+} {1 2 1 4 6 4}
+do_test select5-5.5 {
+  execsql {
+    SELECT a, b FROM t2 GROUP BY a;
+  } 
+} {1 2 6 4}
+
+# Test rendering of columns for the GROUP BY clause.
+#
+do_test select5-5.11 {
+  execsql {
+    SELECT max(c), b*a, b, a FROM t2 GROUP BY b*a, b, a
+  }
+} {3 2 2 1 5 4 4 1 7 24 4 6}
+
+# NULL compare equal to each other for the purposes of processing
+# the GROUP BY clause.
+#
+do_test select5-6.1 {
+  execsql {
+    CREATE TABLE t3(x,y);
+    INSERT INTO t3 VALUES(1,NULL);
+    INSERT INTO t3 VALUES(2,NULL);
+    INSERT INTO t3 VALUES(3,4);
+    SELECT count(x), y FROM t3 GROUP BY y ORDER BY 1
+  }
+} {1 4 2 {}}
+do_test select5-6.2 {
+  execsql {
+    CREATE TABLE t4(x,y,z);
+    INSERT INTO t4 VALUES(1,2,NULL);
+    INSERT INTO t4 VALUES(2,3,NULL);
+    INSERT INTO t4 VALUES(3,NULL,5);
+    INSERT INTO t4 VALUES(4,NULL,6);
+    INSERT INTO t4 VALUES(4,NULL,6);
+    INSERT INTO t4 VALUES(5,NULL,NULL);
+    INSERT INTO t4 VALUES(5,NULL,NULL);
+    INSERT INTO t4 VALUES(6,7,8);
+    SELECT max(x), count(x), y, z FROM t4 GROUP BY y, z ORDER BY 1
+  }
+} {1 1 2 {} 2 1 3 {} 3 1 {} 5 4 2 {} 6 5 2 {} {} 6 1 7 8}
+
+do_test select5-7.2 {
+  execsql {
+    SELECT count(*), count(x) as cnt FROM t4 GROUP BY y ORDER BY cnt;
+  }
+} {1 1 1 1 1 1 5 5}
+
+# See ticket #3324.
+#
+do_test select5-8.1 {
+  execsql {
+    CREATE TABLE t8a(a,b);
+    CREATE TABLE t8b(x);
+    INSERT INTO t8a VALUES('one', 1);
+    INSERT INTO t8a VALUES('one', 2);
+    INSERT INTO t8a VALUES('two', 3);
+    INSERT INTO t8a VALUES('one', NULL);
+    INSERT INTO t8b(rowid,x) VALUES(1,111);
+    INSERT INTO t8b(rowid,x) VALUES(2,222);
+    INSERT INTO t8b(rowid,x) VALUES(3,333);
+    SELECT a, count(b) FROM t8a, t8b WHERE b=t8b.rowid GROUP BY a ORDER BY a;
+  }
+} {one 2 two 1}
+do_test select5-8.2 {
+  execsql {
+    SELECT a, count(b) FROM t8a, t8b WHERE b=+t8b.rowid GROUP BY a ORDER BY a;
+  }
+} {one 2 two 1}
+do_test select5-8.3 {
+  execsql {
+    SELECT t8a.a, count(t8a.b) FROM t8a, t8b WHERE t8a.b=t8b.rowid
+     GROUP BY 1 ORDER BY 1;
+  }
+} {one 2 two 1}
+do_test select5-8.4 {
+  execsql {
+    SELECT a, count(*) FROM t8a, t8b WHERE b=+t8b.rowid GROUP BY a ORDER BY a;
+  }
+} {one 2 two 1}
+do_test select5-8.5 {
+  execsql {
+    SELECT a, count(b) FROM t8a, t8b WHERE b<x GROUP BY a ORDER BY a;
+  }
+} {one 6 two 3}
+do_test select5-8.6 {
+  execsql {
+    SELECT a, count(t8a.b) FROM t8a, t8b WHERE b=t8b.rowid 
+     GROUP BY a ORDER BY 2;
+  }
+} {two 1 one 2}
+do_test select5-8.7 {
+  execsql {
+    SELECT a, count(b) FROM t8a, t8b GROUP BY a ORDER BY 2;
+  }
+} {two 3 one 6}
+do_test select5-8.8 {
+  execsql {
+    SELECT a, count(*) FROM t8a, t8b GROUP BY a ORDER BY 2;
+  }
+} {two 3 one 9}
+
+# 2021-04-26 forum https://sqlite.org/forum/forumpost/74330094d8
+reset_db
+do_execsql_test select5-9.1 {
+  CREATE TABLE t1(a INT, b INT);
+  INSERT INTO t1(a,b) VALUES(1,null),(null,null),(1,null);
+  CREATE UNIQUE INDEX t1b ON t1(abs(b));
+  SELECT quote(a), quote(b), '|' FROM t1 GROUP BY a, abs(b);
+} {NULL NULL | 1 NULL |}
+
+finish_test