# 2014 October 01
#
# 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. The
# focus of this file is testing the SQLITE_DIRECT_OVERFLOW_READ logic.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix ovfl
# Populate table t2:
#
# CREATE TABLE t1(c1 TEXT, c2 TEXT);
#
# with 2000 rows. In each row, c2 spans multiple overflow pages. The text
# value of c1 ranges in size from 1 to 2000 bytes. The idea is to create
# at least one row where the first byte of c2 is also the first byte of
# an overflow page. This was at one point exposing an obscure bug in the
# SQLITE_DIRECT_OVERFLOW_READ logic.
#
do_test 1.1 {
set c2 [string repeat abcdefghij 200]
execsql {
PRAGMA cache_size = 10;
CREATE TABLE t1(c1 TEXT, c2 TEXT);
BEGIN;
}
for {set i 1} {$i <= 2000} {incr i} {
set c1 [string repeat . $i]
execsql { INSERT INTO t1 VALUES($c1, $c2) }
}
execsql COMMIT
} {}
do_execsql_test 1.2 {
SELECT sum(length(c2)) FROM t1;
} [expr 2000 * 2000]
finish_test