Re: [Tarantool-patches] [PATCH v1 1/1] sql: disallow cast of negative DOUBLE to UNSIGNED

[Timur Safin via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

LGTM, thanks!

: From: imeevma@tarantool.org <imeevma@tarantool.org>
: Subject: [PATCH v1 1/1] sql: disallow cast of negative DOUBLE to UNSIGNED
: 
: Prior to this patch it was possible to use CAST(<double> AS UNSIGNED)
: and get negative result. For example, result of CAST(-1.5 AS UNSIGNED)
: was -1. This patch removes this possibility. Now such cast can only
: return UNSIGNED value.
: 
: Closes #6010
: ---
: https://github.com/tarantool/tarantool/issues/6010
: https://github.com/tarantool/tarantool/tree/imeevma/gh-6010-disallow-double-
: to-int-cast
: 
:  ...-6010-disallow-negative-double-to-unsigned-cast |  4 ++++
:  src/box/sql/mem.c                                  |  2 +-
:  test/sql-tap/numcast.test.lua                      | 14 +++++++++++++-
:  test/sql/types.result                              |  7 ++-----
:  4 files changed, 20 insertions(+), 7 deletions(-)
:  create mode 100644 changelogs/unreleased/gh-6010-disallow-negative-double-
: to-unsigned-cast
: 
: diff --git a/changelogs/unreleased/gh-6010-disallow-negative-double-to-
: unsigned-cast b/changelogs/unreleased/gh-6010-disallow-negative-double-to-
: unsigned-cast
: new file mode 100644
: index 000000000..566be594f
: --- /dev/null
: +++ b/changelogs/unreleased/gh-6010-disallow-negative-double-to-unsigned-
: cast
: @@ -0,0 +1,4 @@
: +## bugfix/sql
: +
: +* Fixed explicit cast of negative DOUBLE to UNSIGNED, which could return
: +negative result (gh-6010).
: diff --git a/src/box/sql/mem.c b/src/box/sql/mem.c
: index fa80f6d5a..e4ce233e0 100644
: --- a/src/box/sql/mem.c
: +++ b/src/box/sql/mem.c
: @@ -1061,7 +1061,7 @@ mem_cast_explicit(struct Mem *mem, enum field_type
: type)
:  		case MEM_TYPE_BIN:
:  			return bytes_to_uint(mem);
:  		case MEM_TYPE_DOUBLE:
: -			return double_to_int(mem);
: +			return double_to_uint(mem);
:  		case MEM_TYPE_BOOL:
:  			return bool_to_int(mem);
:  		default:
: diff --git a/test/sql-tap/numcast.test.lua b/test/sql-tap/numcast.test.lua
: index b3aa64e76..20aea3c4b 100755
: --- a/test/sql-tap/numcast.test.lua
: +++ b/test/sql-tap/numcast.test.lua
: @@ -1,6 +1,6 @@
:  #!/usr/bin/env tarantool
:  local test = require("sqltester")
: -test:plan(31)
: +test:plan(32)
: 
:  --!./tcltestrunner.lua
:  -- 2013 March 20
: @@ -249,4 +249,16 @@ test:do_execsql_test(
:          0 , 0.33333333333333, 0.33333333333333
:  })
: 
: +--
: +-- gh-6010: Make sure that a negative DOUBLE value cannot be explicitly
: cast to
: +-- UNSIGNED.
: +--
: +test:do_catchsql_test(
: +    "numcast-4",
: +    [[
: +        SELECT CAST(-2.5 AS UNSIGNED);
: +    ]], {
: +        1, "Type mismatch: can not convert double(-2.5) to unsigned"
: +})
: +
:  test:finish_test()
: diff --git a/test/sql/types.result b/test/sql/types.result
: index a0b8668be..c1e1a8ef1 100644
: --- a/test/sql/types.result
: +++ b/test/sql/types.result
: @@ -1097,11 +1097,8 @@ box.execute("SELECT CAST(1.5 AS UNSIGNED);")
:  ...
:  box.execute("SELECT CAST(-1.5 AS UNSIGNED);")
:  ---
: -- metadata:
: -  - name: COLUMN_1
: -    type: unsigned
: -  rows:
: -  - [-1]
: +- null
: +- 'Type mismatch: can not convert double(-1.5) to unsigned'
:  ...
:  box.execute("SELECT CAST(true AS UNSIGNED);")
:  ---
: --
: 2.25.1