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# 2011 October 13
#
# 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. Specifically,
# it tests that ticket [fa7bf5ec94801e7e2030e41eefe5d9dd96eaacfd] has
# been resolved.
#
# The problem described by this ticket was that the sqlite3ExprCompare()
# function was saying that expressions (x='a') and (x='A') were identical
# because it was using sqlite3StrICmp() instead of strcmp() to compare string
# literals. That was causing the query optimizer for aggregate queries to
# believe that both count() operations were identical, and thus only
# computing the first count() and making a copy of the result for the
# second count().
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
do_test tkt-fa7bf5ec-1 {
execsql {
CREATE TABLE t1(x);
INSERT INTO t1 VALUES ('a');
INSERT INTO t1 VALUES ('A');
INSERT INTO t1 VALUES ('A');
SELECT count(CASE WHEN x='a' THEN 1 END),
count(CASE WHEN x='A' THEN 1 END)
FROM t1;
}
} {1 2}
finish_test
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