/*
* Create a textual representation of a JsonbValue that will serve as a GIN
* key in a jsonb_ops index. is_key is true if the JsonbValue is a key,
* or if it is a string array element (since we pretend those are keys,
* see jsonb.h).
*/
static Datum
make_scalar_key(const JsonbValue *scalarVal, bool is_key)
{
Datum item;
char *cstr;
switch (scalarVal->type)
{
case jbvNull:
Assert(!is_key);
item = make_text_key(JGINFLAG_NULL, "", 0);
break;
case jbvBool:
Assert(!is_key);
item = make_text_key(JGINFLAG_BOOL,
scalarVal->val.boolean ? "t" : "f", 1);
break;
case jbvNumeric:
Assert(!is_key);
/*
* A normalized textual representation, free of trailing zeroes,
* is required so that numerically equal values will produce equal
* strings.
*
* It isn't ideal that numerics are stored in a relatively bulky
* textual format. However, it's a notationally convenient way of
* storing a "union" type in the GIN B-Tree, and indexing Jsonb
* strings takes precedence.
*/
cstr = numeric_normalize(scalarVal->val.numeric);
item = make_text_key(JGINFLAG_NUM, cstr, strlen(cstr));
pfree(cstr);
break;
case jbvString:
item = make_text_key(is_key ? JGINFLAG_KEY : JGINFLAG_STR,
scalarVal->val.string.val,
scalarVal->val.string.len);
break;
default:
elog(ERROR, "unrecognized jsonb scalar type: %d", scalarVal->type);
item = 0; /* keep compiler quiet */
break;
}
return item;
}
/*
* Create a textual representation of a jsonbValue for GIN storage.
*/
static text *
make_scalar_key(const JsonbValue * scalarVal, char flag)
{
text *item;
char *cstr;
switch (scalarVal->type)
{
case jbvNull:
item = make_text_key("n", 1, flag);
break;
case jbvBool:
item = make_text_key(scalarVal->val.boolean ? "t" : "f", 1, flag);
break;
case jbvNumeric:
/*
* A normalized textual representation, free of trailing zeroes is
* is required.
*
* It isn't ideal that numerics are stored in a relatively bulky
* textual format. However, it's a notationally convenient way of
* storing a "union" type in the GIN B-Tree, and indexing Jsonb
* strings takes precedence.
*/
cstr = numeric_normalize(scalarVal->val.numeric);
item = make_text_key(cstr, strlen(cstr), flag);
pfree(cstr);
break;
case jbvString:
item = make_text_key(scalarVal->val.string.val, scalarVal->val.string.len,
flag);
break;
default:
elog(ERROR, "invalid jsonb scalar type");
}
return item;
}
