Import SQLite 3.7.6.3.

third_party/sqlite/src/test/coalesce.test

+# 2009 November 10
+#
+# 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.
+#
+#***********************************************************************
+# Additional test cases for the COALESCE() and IFNULL() functions.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+
+do_test coalesce-1.0 {
+  db eval {
+    CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c, d);
+    INSERT INTO t1 VALUES(1, null, null, null);
+    INSERT INTO t1 VALUES(2, 2, 99, 99);
+    INSERT INTO t1 VALUES(3, null, 3, 99);
+    INSERT INTO t1 VALUES(4, null, null, 4);
+    INSERT INTO t1 VALUES(5, null, null, null);
+    INSERT INTO t1 VALUES(6, 22, 99, 99);
+    INSERT INTO t1 VALUES(7, null, 33, 99);
+    INSERT INTO t1 VALUES(8, null, null, 44);
+
+    SELECT coalesce(b,c,d) FROM t1 ORDER BY a;
+  }
+} {{} 2 3 4 {} 22 33 44}
+do_test coalesce-1.1 {
+  db eval {
+    SELECT coalesce(d+c+b,d+c,d) FROM t1 ORDER BY a;
+  }
+} {{} 200 102 4 {} 220 132 44}
+do_test coalesce-1.2 {
+  db eval {
+    SELECT ifnull(d+c+b,ifnull(d+c,d)) FROM t1 ORDER BY a;
+  }
+} {{} 200 102 4 {} 220 132 44}
+do_test coalesce-1.3 {
+  db eval {
+    SELECT ifnull(ifnull(d+c+b,d+c),d) FROM t1 ORDER BY a;
+  }
+} {{} 200 102 4 {} 220 132 44}
+do_test coalesce-1.4 {
+  db eval {
+    SELECT ifnull(ifnull(b,c),d) FROM t1 ORDER BY a;
+  }
+} {{} 2 3 4 {} 22 33 44}
+do_test coalesce-1.5 {
+  db eval {
+    SELECT ifnull(b,ifnull(c,d)) FROM t1 ORDER BY a;
+  }
+} {{} 2 3 4 {} 22 33 44}
+do_test coalesce-1.6 {
+  db eval {
+    SELECT coalesce(b,NOT b,-b,abs(b),lower(b),length(b),min(b,5),b*123,c)
+      FROM t1 ORDER BY a;
+  }
+} {{} 2 3 {} {} 22 33 {}}
+do_test coalesce-1.7 {
+  db eval {
+    SELECT ifnull(nullif(a,4),99)
+      FROM t1 ORDER BY a;
+  }
+} {1 2 3 99 5 6 7 8}
+do_test coalesce-1.8 {
+  db eval {
+pragma vdbe_listing=on;
+    SELECT coalesce(
+      CASE WHEN b=2 THEN 123 END,
+      CASE WHEN b=3 THEN 234 END,
+      CASE WHEN c=3 THEN 345 WHEN c=33 THEN 456 END,
+      d
+    )
+    FROM t1 ORDER BY a;
+  }
+} {{} 123 345 4 {} 99 456 44}
+
+
+finish_test