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Allow casting between bytea and integer types.

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This allows smallint, integer, and bigint values to be cast to and
from bytea. The bytea value is the two's complement representation of
the integer, with the most significant byte first. For example:

  1234::bytea -> \x000004d2
  (-1234)::bytea -> \xfffffb2e

Author: Aleksander Alekseev <aleksander@timescale.com>
Reviewed-by: Joel Jacobson <joel@compiler.org>
Reviewed-by: Yugo Nagata <nagata@sraoss.co.jp>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Discussion: https://postgr.es/m/CAJ7c6TPtOp6%2BkFX5QX3fH1SVr7v65uHr-7yEJ%3DGMGQi5uhGtcA%40mail.gmail.com
This commit is contained in:
Dean Rasheed
2025-03-07 09:31:18 +00:00
parent d611f8b158
commit 6da469bada
8 changed files with 281 additions and 1 deletions
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2
src/include/catalog/catversion.h
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@@ -57,6 +57,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 202503031
#define CATALOG_VERSION_NO 202503071
#endif

14
src/include/catalog/pg_cast.dat
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@@ -320,6 +320,20 @@
{ castsource => 'varchar', casttarget => 'name', castfunc => 'name(varchar)',
castcontext => 'i', castmethod => 'f' },
# Allow explicit coercions between bytea and integer types
{ castsource => 'int2', casttarget => 'bytea', castfunc => 'bytea(int2)',
castcontext => 'e', castmethod => 'f' },
{ castsource => 'int4', casttarget => 'bytea', castfunc => 'bytea(int4)',
castcontext => 'e', castmethod => 'f' },
{ castsource => 'int8', casttarget => 'bytea', castfunc => 'bytea(int8)',
castcontext => 'e', castmethod => 'f' },
{ castsource => 'bytea', casttarget => 'int2', castfunc => 'int2(bytea)',
castcontext => 'e', castmethod => 'f' },
{ castsource => 'bytea', casttarget => 'int4', castfunc => 'int4(bytea)',
castcontext => 'e', castmethod => 'f' },
{ castsource => 'bytea', casttarget => 'int8', castfunc => 'int8(bytea)',
castcontext => 'e', castmethod => 'f' },
# Allow explicit coercions between int4 and "char"
{ castsource => 'char', casttarget => 'int4', castfunc => 'int4(char)',
castcontext => 'e', castmethod => 'f' },

19
src/include/catalog/pg_proc.dat
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@@ -1165,6 +1165,25 @@
proname => 'name', proleakproof => 't', prorettype => 'name',
proargtypes => 'bpchar', prosrc => 'bpchar_name' },
{ oid => '8577', descr => 'convert int2 to bytea',
proname => 'bytea', proleakproof => 't', prorettype => 'bytea',
proargtypes => 'int2', prosrc => 'int2_bytea' },
{ oid => '8578', descr => 'convert int4 to bytea',
proname => 'bytea', proleakproof => 't', prorettype => 'bytea',
proargtypes => 'int4', prosrc => 'int4_bytea' },
{ oid => '8579', descr => 'convert int8 to bytea',
proname => 'bytea', proleakproof => 't', prorettype => 'bytea',
proargtypes => 'int8', prosrc => 'int8_bytea' },
{ oid => '8580', descr => 'convert bytea to int2',
proname => 'int2', prorettype => 'int2',
proargtypes => 'bytea', prosrc => 'bytea_int2' },
{ oid => '8581', descr => 'convert bytea to int4',
proname => 'int4', prorettype => 'int4',
proargtypes => 'bytea', prosrc => 'bytea_int4' },
{ oid => '8582', descr => 'convert bytea to int8',
proname => 'int8', prorettype => 'int8',
proargtypes => 'bytea', prosrc => 'bytea_int8' },
{ oid => '449', descr => 'hash',
proname => 'hashint2', prorettype => 'int4', proargtypes => 'int2',
prosrc => 'hashint2' },