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Add min and max aggregates for bytea type.

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Similar to a0f1fce80, although we chose to duplicate logic
rather than invoke byteacmp, primarily to avoid repeat detoasting.

Marat Buharov, Aleksander Alekseev

Discussion: https://postgr.es/m/CAPCEVGXiASjodos4P8pgyV7ixfVn-ZgG9YyiRZRbVqbGmfuDyg@mail.gmail.com
This commit is contained in:
Tom Lane
2024-10-08 13:52:14 -04:00
parent 57f3702471
commit 2d24fd942c
8 changed files with 99 additions and 5 deletions
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38
src/backend/utils/adt/varlena.c
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@@ -3931,6 +3931,44 @@ byteacmp(PG_FUNCTION_ARGS)
PG_RETURN_INT32(cmp);
}
Datum
bytea_larger(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_PP(0);
bytea *arg2 = PG_GETARG_BYTEA_PP(1);
bytea *result;
int len1,
len2;
int cmp;
len1 = VARSIZE_ANY_EXHDR(arg1);
len2 = VARSIZE_ANY_EXHDR(arg2);
cmp = memcmp(VARDATA_ANY(arg1), VARDATA_ANY(arg2), Min(len1, len2));
result = ((cmp > 0) || ((cmp == 0) && (len1 > len2)) ? arg1 : arg2);
PG_RETURN_BYTEA_P(result);
}
Datum
bytea_smaller(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_PP(0);
bytea *arg2 = PG_GETARG_BYTEA_PP(1);
bytea *result;
int len1,
len2;
int cmp;
len1 = VARSIZE_ANY_EXHDR(arg1);
len2 = VARSIZE_ANY_EXHDR(arg2);
cmp = memcmp(VARDATA_ANY(arg1), VARDATA_ANY(arg2), Min(len1, len2));
result = ((cmp < 0) || ((cmp == 0) && (len1 < len2)) ? arg1 : arg2);
PG_RETURN_BYTEA_P(result);
}
Datum
bytea_sortsupport(PG_FUNCTION_ARGS)
{