Index: third_party/sqlite/sqlite-src-3170000/test/orderby9.test |
diff --git a/third_party/sqlite/sqlite-src-3170000/test/orderby9.test b/third_party/sqlite/sqlite-src-3170000/test/orderby9.test |
new file mode 100644 |
index 0000000000000000000000000000000000000000..581951c79563e2a7ce924d711c1a29a18ed6ce36 |
--- /dev/null |
+++ b/third_party/sqlite/sqlite-src-3170000/test/orderby9.test |
@@ -0,0 +1,62 @@ |
+# 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 |