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third_party/sqlite/src/test/minmax2.test

Index: third_party/sqlite/src/test/minmax2.test
diff --git a/third_party/sqlite/src/test/minmax2.test b/third_party/sqlite/src/test/minmax2.test
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+# 2007 July 17
+#
+# 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 SELECT statements that contain
+# aggregate min() and max() functions and which are handled as
+# as a special case.  This file makes sure that the min/max
+# optimization works right in the presence of descending
+# indices.  Ticket #2514.
+#
+# $Id: minmax2.test,v 1.2 2008/01/05 17:39:30 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test minmax2-1.0 {
+  execsql {
+    PRAGMA legacy_file_format=0;
+    BEGIN;
+    CREATE TABLE t1(x, y);
+    INSERT INTO t1 VALUES(1,1);
+    INSERT INTO t1 VALUES(2,2);
+    INSERT INTO t1 VALUES(3,2);
+    INSERT INTO t1 VALUES(4,3);
+    INSERT INTO t1 VALUES(5,3);
+    INSERT INTO t1 VALUES(6,3);
+    INSERT INTO t1 VALUES(7,3);
+    INSERT INTO t1 VALUES(8,4);
+    INSERT INTO t1 VALUES(9,4);
+    INSERT INTO t1 VALUES(10,4);
+    INSERT INTO t1 VALUES(11,4);
+    INSERT INTO t1 VALUES(12,4);
+    INSERT INTO t1 VALUES(13,4);
+    INSERT INTO t1 VALUES(14,4);
+    INSERT INTO t1 VALUES(15,4);
+    INSERT INTO t1 VALUES(16,5);
+    INSERT INTO t1 VALUES(17,5);
+    INSERT INTO t1 VALUES(18,5);
+    INSERT INTO t1 VALUES(19,5);
+    INSERT INTO t1 VALUES(20,5);
+    COMMIT;
+    SELECT DISTINCT y FROM t1 ORDER BY y;
+  }
+} {1 2 3 4 5}
+
+do_test minmax2-1.1 {
+  set sqlite_search_count 0
+  execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax2-1.2 {
+  set sqlite_search_count
+} {19}
+do_test minmax2-1.3 {
+  set sqlite_search_count 0
+  execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax2-1.4 {
+  set sqlite_search_count
+} {19}
+do_test minmax2-1.5 {
+  execsql {CREATE INDEX t1i1 ON t1(x DESC)}
+  set sqlite_search_count 0
+  execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax2-1.6 {
+  set sqlite_search_count
+} {1}
+do_test minmax2-1.7 {
+  set sqlite_search_count 0
+  execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax2-1.8 {
+  set sqlite_search_count
+} {0}
+do_test minmax2-1.9 {
+  set sqlite_search_count 0
+  execsql {SELECT max(y) FROM t1}
+} {5}
+do_test minmax2-1.10 {
+  set sqlite_search_count
+} {19}
+
+do_test minmax2-2.0 {
+  execsql {
+    CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
+    INSERT INTO t2 SELECT * FROM t1;
+  }
+  set sqlite_search_count 0
+  execsql {SELECT min(a) FROM t2}
+} {1}
+do_test minmax2-2.1 {
+  set sqlite_search_count
+} {0}
+do_test minmax2-2.2 {
+  set sqlite_search_count 0
+  execsql {SELECT max(a) FROM t2}
+} {20}
+do_test minmax2-2.3 {
+  set sqlite_search_count
+} {0}
+
+do_test minmax2-3.0 {
+  ifcapable subquery {
+    execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+  } else {
+    db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
+    execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
+  }
+  set sqlite_search_count 0
+  execsql {SELECT max(a) FROM t2}
+} {21}
+do_test minmax2-3.1 {
+  set sqlite_search_count
+} {0}
+do_test minmax2-3.2 {
+  ifcapable subquery {
+    execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+  } else {
+    db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
+    execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
+  }
+  set sqlite_search_count 0
+  ifcapable subquery {
+    execsql { SELECT b FROM t2 WHERE a=(SELECT max(a) FROM t2) }
+  } else {
+    execsql { SELECT b FROM t2 WHERE a=max_a_t2() }
+  }
+} {999}
+do_test minmax2-3.3 {
+  set sqlite_search_count
+} {0}
+
+ifcapable {compound && subquery} {
+  do_test minmax2-4.1 {
+    execsql {
+      SELECT coalesce(min(x+0),-1), coalesce(max(x+0),-1) FROM
+        (SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y')
+    }
+  } {1 20}
+  do_test minmax2-4.2 {
+    execsql {
+      SELECT y, coalesce(sum(x),0) FROM
+        (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
+      GROUP BY y ORDER BY y;
+    }
+  } {1 1 2 5 3 22 4 92 5 90 6 0}
+  do_test minmax2-4.3 {
+    execsql {
+      SELECT y, count(x), count(*) FROM
+        (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
+      GROUP BY y ORDER BY y;
+    }
+  } {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1}
+} ;# ifcapable compound
+
+# Make sure the min(x) and max(x) optimizations work on empty tables
+# including empty tables with indices. Ticket #296.
+#
+do_test minmax2-5.1 {
+  execsql {
+    CREATE TABLE t3(x INTEGER UNIQUE NOT NULL);
+    SELECT coalesce(min(x),999) FROM t3;
+  }
+} {999}
+do_test minmax2-5.2 {
+  execsql {
+    SELECT coalesce(min(rowid),999) FROM t3;
+  }
+} {999}
+do_test minmax2-5.3 {
+  execsql {
+    SELECT coalesce(max(x),999) FROM t3;
+  }
+} {999}
+do_test minmax2-5.4 {
+  execsql {
+    SELECT coalesce(max(rowid),999) FROM t3;
+  }
+} {999}
+do_test minmax2-5.5 {
+  execsql {
+    SELECT coalesce(max(rowid),999) FROM t3 WHERE rowid<25;
+  }
+} {999}
+
+# Make sure the min(x) and max(x) optimizations work when there
+# is a LIMIT clause.  Ticket #396.
+#
+do_test minmax2-6.1 {
+  execsql {
+    SELECT min(a) FROM t2 LIMIT 1
+  }
+} {1}
+do_test minmax2-6.2 {
+  execsql {
+    SELECT max(a) FROM t2 LIMIT 3
+  }
+} {22}
+do_test minmax2-6.3 {
+  execsql {
+    SELECT min(a) FROM t2 LIMIT 0,100
+  }
+} {1}
+do_test minmax2-6.4 {
+  execsql {
+    SELECT max(a) FROM t2 LIMIT 1,100
+  }
+} {}
+do_test minmax2-6.5 {
+  execsql {
+    SELECT min(x) FROM t3 LIMIT 1
+  }
+} {{}}
+do_test minmax2-6.6 {
+  execsql {
+    SELECT max(x) FROM t3 LIMIT 0
+  }
+} {}
+do_test minmax2-6.7 {
+  execsql {
+    SELECT max(a) FROM t2 LIMIT 0
+  }
+} {}
+
+# Make sure the max(x) and min(x) optimizations work for nested
+# queries.  Ticket #587.
+#
+do_test minmax2-7.1 {
+  execsql {
+    SELECT max(x) FROM t1;
+  }
+} 20
+ifcapable subquery {
+  do_test minmax2-7.2 {
+    execsql {
+      SELECT * FROM (SELECT max(x) FROM t1);
+    }
+  } 20
+}
+do_test minmax2-7.3 {
+  execsql {
+    SELECT min(x) FROM t1;
+  }
+} 1
+ifcapable subquery {
+  do_test minmax2-7.4 {
+    execsql {
+      SELECT * FROM (SELECT min(x) FROM t1);
+    }
+  } 1
+}
+
+# Make sure min(x) and max(x) work correctly when the datatype is
+# TEXT instead of NUMERIC.  Ticket #623.
+#
+do_test minmax2-8.1 {
+  execsql {
+    CREATE TABLE t4(a TEXT);
+    INSERT INTO t4 VALUES('1234');
+    INSERT INTO t4 VALUES('234');
+    INSERT INTO t4 VALUES('34');
+    SELECT min(a), max(a) FROM t4;
+  }
+} {1234 34}
+do_test minmax2-8.2 {
+  execsql {
+    CREATE TABLE t5(a INTEGER);
+    INSERT INTO t5 VALUES('1234');
+    INSERT INTO t5 VALUES('234');
+    INSERT INTO t5 VALUES('34');
+    SELECT min(a), max(a) FROM t5;
+  }
+} {34 1234}
+
+# Ticket #658:  Test the min()/max() optimization when the FROM clause
+# is a subquery.
+#
+ifcapable {compound && subquery} {
+  do_test minmax2-9.1 {
+    execsql {
+      SELECT max(rowid) FROM (
+        SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5
+      )
+    }
+  } {1}
+  do_test minmax2-9.2 {
+    execsql {
+      SELECT max(rowid) FROM (
+        SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5
+      )
+    }
+  } {{}}
+} ;# ifcapable compound&&subquery
+
+# If there is a NULL in an aggregate max() or min(), ignore it.  An
+# aggregate min() or max() will only return NULL if all values are NULL.
+#
+do_test minmax2-10.1 {
+  execsql {
+    CREATE TABLE t6(x);
+    INSERT INTO t6 VALUES(1);
+    INSERT INTO t6 VALUES(2);
+    INSERT INTO t6 VALUES(NULL);
+    SELECT coalesce(min(x),-1) FROM t6;
+  }
+} {1}
+do_test minmax2-10.2 {
+  execsql {
+    SELECT max(x) FROM t6;
+  }
+} {2}
+do_test minmax2-10.3 {
+  execsql {
+    CREATE INDEX i6 ON t6(x DESC);
+    SELECT coalesce(min(x),-1) FROM t6;
+  }
+} {1}
+do_test minmax2-10.4 {
+  execsql {
+    SELECT max(x) FROM t6;
+  }
+} {2}
+do_test minmax2-10.5 {
+  execsql {
+    DELETE FROM t6 WHERE x NOT NULL;
+    SELECT count(*) FROM t6;
+  }
+} 1
+do_test minmax2-10.6 {
+  execsql {
+    SELECT count(x) FROM t6;
+  }
+} 0
+ifcapable subquery {
+  do_test minmax2-10.7 {
+    execsql {
+      SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+    }
+  } {{} {}}
+}
+do_test minmax2-10.8 {
+  execsql {
+    SELECT min(x), max(x) FROM t6;
+  }
+} {{} {}}
+do_test minmax2-10.9 {
+  execsql {
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    INSERT INTO t6 SELECT * FROM t6;
+    SELECT count(*) FROM t6;
+  }
+} 1024
+do_test minmax2-10.10 {
+  execsql {
+    SELECT count(x) FROM t6;
+  }
+} 0
+ifcapable subquery {
+  do_test minmax2-10.11 {
+    execsql {
+      SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+    }
+  } {{} {}}
+}
+do_test minmax2-10.12 {
+  execsql {
+    SELECT min(x), max(x) FROM t6;
+  }
+} {{} {}}
+
+
+finish_test