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Fix the fastpath rule for jsonb_concat with an empty operand.

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To prevent perverse results, we now only return the other operand if
it's not scalar, and if both operands are of the same kind (array or
object).

Original bug complaint and patch from Oskari Saarenmaa, extended by me
to cover the cases of different kinds of jsonb.

Backpatch to 9.5 where jsonb_concat was introduced.
This commit is contained in:
Andrew Dunstan
2015-09-13 17:06:45 -04:00
parent 63c0f5b20b
commit f243072a9c
4 changed files with 90 additions and 5 deletions
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16
src/backend/utils/adt/jsonfuncs.c
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@ -3359,12 +3359,18 @@ jsonb_concat(PG_FUNCTION_ARGS)
*it2;
/*
* If one of the jsonb is empty, just return other.
* If one of the jsonb is empty, just return the other if it's not
* scalar and both are of the same kind. If it's a scalar or they are
* of different kinds we need to perform the concatenation even if one is
* empty.
*/
if (JB_ROOT_COUNT(jb1) == 0)
PG_RETURN_JSONB(jb2);
else if (JB_ROOT_COUNT(jb2) == 0)
PG_RETURN_JSONB(jb1);
if (JB_ROOT_IS_OBJECT(jb1) == JB_ROOT_IS_OBJECT(jb2))
{
if (JB_ROOT_COUNT(jb1) == 0 && !JB_ROOT_IS_SCALAR(jb2))
PG_RETURN_JSONB(jb2);
else if (JB_ROOT_COUNT(jb2) == 0 && !JB_ROOT_IS_SCALAR(jb1))
PG_RETURN_JSONB(jb1);
}
it1 = JsonbIteratorInit(&jb1->root);
it2 = JsonbIteratorInit(&jb2->root);