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+# 2017 August 07
+#
+# 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 script testing the ability of SQLite to use mmap
+# to access files larger than 4GiB.
+#
+
+if {[file exists skip-big-file]} return
+if {$tcl_platform(os)=="Darwin"} return
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix bigmmap
+
+ifcapable !mmap||!vtab {
+ finish_test
+ return
+}
+
+set mmap_limit 0
+db eval {
+ SELECT compile_options AS x FROM pragma_compile_options
+ WHERE x LIKE 'max_mmap_size=%'
+} {
+ regexp {MAX_MMAP_SIZE=([0-9]*)} $x -> mmap_limit
+}
+if {$mmap_limit < [expr 8 * 1<<30]} {
+ puts "Skipping bigmmap.test - requires SQLITE_MAX_MMAP_SIZE >= 8G"
+ finish_test
+ return
+}
+
+
+#-------------------------------------------------------------------------
+# Create the database file roughly 8GiB in size. Most pages are unused,
+# except that there is a table and index clustered around each 1GiB
+# boundary.
+#
+do_execsql_test 1.0 {
+ PRAGMA page_size = 4096;
+ CREATE TABLE t0(a INTEGER PRIMARY KEY, b, c, UNIQUE(b, c));
+ WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s LIMIT 100 )
+ INSERT INTO t0 SELECT i, 't0', randomblob(800) FROM s;
+}
+
+for {set i 1} {$i < 8} {incr i} {
+ if {[catch {fake_big_file [expr $i*1024] [get_pwd]/test.db}]} {
+ puts "Cannot create ${i}MB sparse file"
+ finish_test
+ return
+ }
+ hexio_write test.db 28 [format %.8x [expr ($i*1024*1024*1024/4096) - 5]]
+
+ do_execsql_test 1.$i "
+ CREATE TABLE t$i (a INTEGER PRIMARY KEY, b, c, UNIQUE(b, c));
+ WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s LIMIT 100 )
+ INSERT INTO t$i SELECT i, 't$i', randomblob(800) FROM s;
+ "
+}
+
+#-------------------------------------------------------------------------
+# Check that data can be retrieved from the db with a variety of
+# configured mmap size limits.
+#
+for {set i 0} {$i < 9} {incr i} {
+
+ # Configure a memory mapping $i GB in size.
+ #
+ set val [expr $i*1024*1024*1024]
+ execsql "PRAGMA main.mmap_size = $val"
+ do_execsql_test 2.$i.0 {
+ PRAGMA main.mmap_size
+ } $val
+
+ for {set t 0} {$t < 8} {incr t} {
+ do_execsql_test 2.$i.$t.1 "
+ SELECT count(*) FROM t$t;
+ SELECT count(b || c) FROM t$t GROUP BY b;
+ " {100 100}
+
+ do_execsql_test 2.$i.$t.2 "
+ SELECT * FROM t$t AS o WHERE
+ NOT EXISTS( SELECT * FROM t$t AS i WHERE a=o.a AND +b=o.b AND +c=o.c )
+ ORDER BY b, c;
+ " {}
+
+ do_eqp_test 2.$i.$t.3 "
+ SELECT * FROM t$t AS o WHERE
+ NOT EXISTS( SELECT * FROM t$t AS i WHERE a=o.a AND +b=o.b AND +c=o.c )
+ ORDER BY b, c;
+ " [string map {"\n " "\n"} "
+ QUERY PLAN
+ |--SCAN o USING COVERING INDEX sqlite_autoindex_t${t}_1
+ `--CORRELATED SCALAR SUBQUERY xxxxxx
+ `--SEARCH i USING INTEGER PRIMARY KEY (rowid=?)
+ "]
+ }
+}
+
+finish_test