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Keep the full precision of integers if possible when casting to "numeric".

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Ticket #2364. (CVS 4012)

FossilOrigin-Name: 2ac985a38034da87b0fa3837976e1f2164b22672
This commit is contained in:
drh
2007-05-16 11:55:56 +00:00
parent 056c8f782e
commit cd7b46db84
5 changed files with 99 additions and 20 deletions
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72
test/cast.test
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@ -11,7 +11,7 @@
# This file implements regression tests for SQLite library. The
# focus of this file is testing the CAST operator.
#
# $Id: cast.test,v 1.5 2006/03/03 19:12:30 drh Exp $
# $Id: cast.test,v 1.6 2007/05/16 11:55:57 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -192,5 +192,75 @@ do_test cast-2.2 {
execsql {SELECT CAST(' -123.456' AS real)}
} -123.456
# ticket #2364. Use full percision integers if possible when casting
# to numeric. Do not fallback to real (and the corresponding 48-bit
# mantissa) unless absolutely necessary.
#
do_test cast-3.1 {
execsql {SELECT CAST(9223372036854774800 AS integer)}
} 9223372036854774800
do_test cast-3.2 {
execsql {SELECT CAST(9223372036854774800 AS numeric)}
} 9223372036854774800
do_test cast-3.3 {
execsql {SELECT CAST(9223372036854774800 AS real)}
} 9.22337203685477e+18
do_test cast-3.4 {
execsql {SELECT CAST(CAST(9223372036854774800 AS real) AS integer)}
} 9223372036854774784
do_test cast-3.5 {
execsql {SELECT CAST(-9223372036854774800 AS integer)}
} -9223372036854774800
do_test cast-3.6 {
execsql {SELECT CAST(-9223372036854774800 AS numeric)}
} -9223372036854774800
do_test cast-3.7 {
execsql {SELECT CAST(-9223372036854774800 AS real)}
} -9.22337203685477e+18
do_test cast-3.8 {
execsql {SELECT CAST(CAST(-9223372036854774800 AS real) AS integer)}
} -9223372036854774784
do_test cast-3.11 {
execsql {SELECT CAST('9223372036854774800' AS integer)}
} 9223372036854774800
do_test cast-3.12 {
execsql {SELECT CAST('9223372036854774800' AS numeric)}
} 9223372036854774800
do_test cast-3.13 {
execsql {SELECT CAST('9223372036854774800' AS real)}
} 9.22337203685477e+18
do_test cast-3.14 {
execsql {SELECT CAST(CAST('9223372036854774800' AS real) AS integer)}
} 9223372036854774784
do_test cast-3.15 {
execsql {SELECT CAST('-9223372036854774800' AS integer)}
} -9223372036854774800
do_test cast-3.16 {
execsql {SELECT CAST('-9223372036854774800' AS numeric)}
} -9223372036854774800
do_test cast-3.17 {
execsql {SELECT CAST('-9223372036854774800' AS real)}
} -9.22337203685477e+18
do_test cast-3.18 {
execsql {SELECT CAST(CAST('-9223372036854774800' AS real) AS integer)}
} -9223372036854774784
if {[db eval {PRAGMA encoding}]=="UTF-8"} {
do_test cast-3.21 {
execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS integer)}
} 9223372036854774800
do_test cast-3.22 {
execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS numeric)}
} 9223372036854774800
do_test cast-3.23 {
execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS real)}
} 9.22337203685477e+18
do_test cast-3.24 {
execsql {SELECT CAST(CAST(x'39323233333732303336383534373734383030' AS real) AS integer)}
} 9223372036854774784
}
do_test case-3.31 {
execsql {SELECT CAST(NULL AS numeric)}
} {{}}
finish_test