63 lines
1.8 KiB
Plaintext
63 lines
1.8 KiB
Plaintext
# 2015-08-26
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library.
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#
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# This file seeks to verify that expressions (and especially functions)
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# that are in both the ORDER BY clause and the result set are only
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# evaluated once.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set ::testprefix orderby9
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do_execsql_test setup {
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-- create a table with many entries
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CREATE TABLE t1(x);
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WITH RECURSIVE
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c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)
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INSERT INTO t1 SELECT x FROM c;
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}
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# Some versions of TCL are unable to [lsort -int] for
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# 64-bit integers. So we write our own comparison
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# routine.
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proc bigintcompare {a b} {
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set x [expr {$a-$b}]
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if {$x<0} {return -1}
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if {$x>0} {return +1}
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return 0
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}
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do_test 1.0 {
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set l1 {}
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# If random() is only evaluated once and then reused for each row, then
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# the output should appear in sorted order. If random() is evaluated
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# separately for the result set and the ORDER BY clause, then the output
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# order will be random.
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db eval {SELECT random() AS y FROM t1 ORDER BY 1;} {lappend l1 $y}
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expr {$l1==[lsort -command bigintcompare $l1]}
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} {1}
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do_test 1.1 {
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set l1 {}
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db eval {SELECT random() AS y FROM t1 ORDER BY random();} {lappend l1 $y}
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expr {$l1==[lsort -command bigintcompare $l1]}
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} {1}
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do_test 1.2 {
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set l1 {}
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db eval {SELECT random() AS y FROM t1 ORDER BY +random();} {lappend l1 $y}
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expr {$l1==[lsort -command bigintcompare $l1]}
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} {0}
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finish_test
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