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Optimize get_jsonb_path_all avoiding an iterator

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Instead of creating an iterator object at each step down the JSONB
object/array, we can just just examine its object/array flags, which is
faster.  Also, use the recently introduced JsonbValueAsText instead of
open-coding the same thing, for code simplicity.

Author: Nikita Glukhov
Discussion: https://postgr.es/m/7c417f90-f95f-247e-ba63-d95e39c0ad14@postgrespro.ru
This commit is contained in:
Alvaro Herrera 2019-09-20 19:18:24 -03:00
parent abb014a631
commit dbb9aeda99
1 changed files with 10 additions and 23 deletions
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33
src/backend/utils/adt/jsonfuncs.c
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@ -1329,7 +1329,6 @@ get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
ArrayType *path = PG_GETARG_ARRAYTYPE_P(1);
Jsonb *res;
Datum *pathtext;
bool *pathnulls;
int npath;
@ -1337,7 +1336,6 @@ get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text)
bool have_object = false,
have_array = false;
JsonbValue *jbvp = NULL;
JsonbValue tv;
JsonbContainer *container;
/*
@ -1449,41 +1447,30 @@ get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text)
if (jbvp->type == jbvBinary)
{
JsonbIterator *it = JsonbIteratorInit((JsonbContainer *) jbvp->val.binary.data);
JsonbIteratorToken r;
r = JsonbIteratorNext(&it, &tv, true);
container = (JsonbContainer *) jbvp->val.binary.data;
have_object = r == WJB_BEGIN_OBJECT;
have_array = r == WJB_BEGIN_ARRAY;
container = jbvp->val.binary.data;
have_object = JsonContainerIsObject(container);
have_array = JsonContainerIsArray(container);
Assert(!JsonContainerIsScalar(container));
}
else
{
have_object = jbvp->type == jbvObject;
have_array = jbvp->type == jbvArray;
Assert(IsAJsonbScalar(jbvp));
have_object = false;
have_array = false;
}
}
if (as_text)
{
/* special-case outputs for string and null values */
if (jbvp->type == jbvString)
PG_RETURN_TEXT_P(cstring_to_text_with_len(jbvp->val.string.val,
jbvp->val.string.len));
if (jbvp->type == jbvNull)
PG_RETURN_NULL();
}
res = JsonbValueToJsonb(jbvp);
if (as_text)
{
PG_RETURN_TEXT_P(cstring_to_text(JsonbToCString(NULL,
&res->root,
VARSIZE(res))));
PG_RETURN_TEXT_P(JsonbValueAsText(jbvp));
}
else
{
Jsonb *res = JsonbValueToJsonb(jbvp);
/* not text mode - just hand back the jsonb */
PG_RETURN_JSONB_P(res);
}