Unexpected error when using select or pairs with after #11221
Description
Bug description
Using select or pairs with after given as a tuple or table may result in unexpected errors.
The problem is that when we encode after we reuse the same buffer we used for encoding key without taking account the fact that it may be relocated:
tarantool/src/box/lua/schema.lua
Lines 2639 to 2646 in 6054c73
tarantool/src/box/lua/schema.lua
Lines 2130 to 2131 in 6054c73
Tarantool version:
Tarantool 3.4.0-entrypoint-168-g26b50791bb16
Target: Linux-x86_64-Debug
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/home/vlad/src/tarantool/tarantool/build/debug/install -DENABLE_BACKTRACE=TRUE
Compiler: GNU-13.2.0
C_FLAGS: -fexceptions -funwind-tables -fasynchronous-unwind-tables -fno-common -msse2 -Wformat -Wformat-security -Werror=format-security -fstack-protector-strong -fPIC -fmacro-prefix-map=/home/vlad/src/tarantool/tarantool=. -std=c11 -Wall -Wextra -Wno-gnu-alignof-expression -fno-gnu89-inline -Wno-cast-function-type -Werror -g -ggdb -O0
CXX_FLAGS: -fexceptions -funwind-tables -fasynchronous-unwind-tables -fno-common -msse2 -Wformat -Wformat-security -Werror=format-security -fstack-protector-strong -fPIC -fmacro-prefix-map=/home/vlad/src/tarantool/tarantool=. -std=c++11 -Wall -Wextra -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Wno-cast-function-type -Werror -g -ggdb -O0
Steps to reproduce
Run the following script:
box.cfg{log_level = 'warn'}
box.space._schema:select({}, {iterator = 'ge', after = {'y'}})
box.space._schema:select({}, {iterator = 'ge', after = {string.rep('y', 100000)}})
os.exit(0)Actual behavior
The script fails with the error:
2025-03-04 22:45:08.841 [146040] main test.lua:3 E> ER_KEY_PART_COUNT: Invalid key part count (expected [0..1], got 20560)
2025-03-04 22:45:08.841 [146040] main say.c:85 F> fatal error, exiting the event loop
Expected behavior
The script exits without errors.