On 25.01.2017 23:58, Tom Lane wrote:
I think you need to take a second look at the code you're producing
and realize that it's not so clean either. This extract from
populate_record_field, for example, is pretty horrid:
But what if we introduce some helper macros like this:
#define JsValueIsNull(jsv) \
((jsv)->is_json ? !(jsv)->val.json.str \
: !(jsv)->val.jsonb || (jsv)->val.jsonb->type == jbvNull)
#define JsValueIsString(jsv) \
((jsv)->is_json ? (jsv)->val.json.type == JSON_TOKEN_STRING \
: (jsv)->val.jsonb && (jsv)->val.jsonb->type == jbvString)
/* prepare column metadata cache for the given type */
if (col->typid != typid || col->typmod != typmod)
prepare_column_cache(col, typid, typmod, mcxt, jsv->is_json);
*isnull = JsValueIsNull(jsv);
typcat = col->typcat;
/* try to convert json string to a non-scalar type through input function
*/
if (JsValueIsString(jsv) &&
(typcat == TYPECAT_ARRAY || typcat == TYPECAT_COMPOSITE))
typcat = TYPECAT_SCALAR;
/* we must perform domain checks for NULLs */
if (*isnull && typcat != TYPECAT_DOMAIN)
return (Datum) 0;
--
Nikita Glukhov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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