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+# 2015-08-26
+#
+# 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.
+#
+# This file seeks to verify that expressions (and especially functions)
+# that are in both the ORDER BY clause and the result set are only
+# evaluated once.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set ::testprefix orderby9
+
+
+do_execsql_test setup {
+ -- create a table with many entries
+ CREATE TABLE t1(x);
+ WITH RECURSIVE
+ c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)
+ INSERT INTO t1 SELECT x FROM c;
+}
+
+# Some versions of TCL are unable to [lsort -int] for
+# 64-bit integers. So we write our own comparison
+# routine.
+proc bigintcompare {a b} {
+ set x [expr {$a-$b}]
+ if {$x<0} {return -1}
+ if {$x>0} {return +1}
+ return 0
+}
+do_test 1.0 {
+ set l1 {}
+ # If random() is only evaluated once and then reused for each row, then
+ # the output should appear in sorted order. If random() is evaluated
+ # separately for the result set and the ORDER BY clause, then the output
+ # order will be random.
+ db eval {SELECT random() AS y FROM t1 ORDER BY 1;} {lappend l1 $y}
+ expr {$l1==[lsort -command bigintcompare $l1]}
+} {1}
+
+do_test 1.1 {
+ set l1 {}
+ db eval {SELECT random() AS y FROM t1 ORDER BY random();} {lappend l1 $y}
+ expr {$l1==[lsort -command bigintcompare $l1]}
+} {1}
+
+do_test 1.2 {
+ set l1 {}
+ db eval {SELECT random() AS y FROM t1 ORDER BY +random();} {lappend l1 $y}
+ expr {$l1==[lsort -command bigintcompare $l1]}
+} {0}
+
+finish_test