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Make hstore_to_jsonb_loose match hstore_to_json_loose on what's a number.

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Commit e09996ff8d removed some ad-hoc code in hstore_to_json_loose
that determined whether an hstore value string looked like a number,
in favor of calling the JSON parser's is-it-a-number code.  However,
it neglected the fact that the exact same code appeared in
hstore_to_jsonb_loose.

This is not a bug, exactly, because the requirements on the two functions
are not the same: hstore_to_json_loose must accept only syntactically legal
JSON numbers as numbers, or it will produce invalid JSON output, as per bug
#12070 which spawned the prior commit.  But hstore_to_jsonb_loose could
accept anything that numeric_in will eat, other than Inf and NaN.

Nonetheless it seems surprising and arbitrary that the two functions don't
use the same rules for what is a number versus what is a string; especially
since they did use the same rules before the aforesaid commit.  For one
thing, that means that doing hstore_to_json_loose and then casting to jsonb
can produce results different from doing just hstore_to_jsonb_loose.

Hence, change hstore_to_jsonb_loose's logic to match hstore_to_json_loose,
ie, hstore values are treated as numbers when they match the JSON syntax
for numbers.

No back-patch, since this is more in the nature of a definitional change
than a bug fix.
This commit is contained in:
Tom Lane 2016-02-03 12:03:50 -05:00
parent 52b63649fc
commit 41d2c081ce
1 changed files with 1 additions and 42 deletions
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43
contrib/hstore/hstore_io.c
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@ -1387,7 +1387,6 @@ hstore_to_jsonb_loose(PG_FUNCTION_ARGS)
JsonbParseState *state = NULL;
JsonbValue *res;
StringInfoData tmp;
bool is_number;
initStringInfo(&tmp);
@ -1423,50 +1422,10 @@ hstore_to_jsonb_loose(PG_FUNCTION_ARGS)
}
else
{
is_number = false;
resetStringInfo(&tmp);
appendBinaryStringInfo(&tmp, HSTORE_VAL(entries, base, i),
HSTORE_VALLEN(entries, i));
/*
* don't treat something with a leading zero followed by another
* digit as numeric - could be a zip code or similar
*/
if (tmp.len > 0 &&
!(tmp.data[0] == '0' &&
isdigit((unsigned char) tmp.data[1])) &&
strspn(tmp.data, "+-0123456789Ee.") == tmp.len)
{
/*
* might be a number. See if we can input it as a numeric
* value. Ignore any actual parsed value.
*/
char *endptr = "junk";
long lval;
lval = strtol(tmp.data, &endptr, 10);
(void) lval;
if (*endptr == '\0')
{
/*
* strol man page says this means the whole string is
* valid
*/
is_number = true;
}
else
{
/* not an int - try a double */
double dval;
dval = strtod(tmp.data, &endptr);
(void) dval;
if (*endptr == '\0')
is_number = true;
}
}
if (is_number)
if (IsValidJsonNumber(tmp.data, tmp.len))
{
val.type = jbvNumeric;
val.val.numeric = DatumGetNumeric(