Fix corner-case 64-bit integer subtraction bug on some platforms.
When computing "0 - INT64_MIN", most platforms would report an
overflow error, which is correct. However, platforms without integer
overflow builtins or 128-bit integers would fail to spot the overflow,
and incorrectly return INT64_MIN.
Back-patch to all supported branches.
Patch be me. Thanks to Jian He for initial investigation, and Laurenz
Albe and Tom Lane for review.
Discussion: https://postgr.es/m/CAEZATCUNK-AZSD0jVdgkk0N%3DNcAXBWeAEX-QU9AnJPensikmdQ%40mail.gmail.com
Branch
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REL_15_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/308a69a9878212bc2f96279023ce16070dac9214
Modified Files
--------------
src/include/common/int.h | 6 +++++-
src/test/regress/expected/int8.out | 2 ++
src/test/regress/sql/int8.sql | 1 +
3 files changed, 8 insertions(+), 1 deletion(-)
