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JSON_TABLE

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This feature allows jsonb data to be treated as a table and thus used in
a FROM clause like other tabular data. Data can be selected from the
jsonb using jsonpath expressions, and hoisted out of nested structures
in the jsonb to form multiple rows, more or less like an outer join.

Nikita Glukhov

Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zhihong Yu (whose
name I previously misspelled), Himanshu Upadhyaya, Daniel Gustafsson,
Justin Pryzby.

Discussion: https://postgr.es/m/7e2cb85d-24cf-4abb-30a5-1a33715959bd@postgrespro.ru
This commit is contained in:
Andrew Dunstan
2022-04-04 15:36:03 -04:00
parent c42a6fc41d
commit 4e34747c88
31 changed files with 2605 additions and 34 deletions
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18
src/backend/executor/execExprInterp.c
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@ -4602,6 +4602,7 @@ ExecEvalJsonBehavior(ExprContext *econtext, JsonBehavior *behavior,
case JSON_BEHAVIOR_NULL:
case JSON_BEHAVIOR_UNKNOWN:
case JSON_BEHAVIOR_EMPTY:
*is_null = true;
return (Datum) 0;
@ -4694,8 +4695,14 @@ EvalJsonPathVar(void *cxt, char *varName, int varNameLen,
if (!var->evaluated)
{
MemoryContext oldcxt = var->mcxt ?
MemoryContextSwitchTo(var->mcxt) : NULL;
var->value = ExecEvalExpr(var->estate, var->econtext, &var->isnull);
var->evaluated = true;
if (oldcxt)
MemoryContextSwitchTo(oldcxt);
}
if (var->isnull)
@ -4843,6 +4850,7 @@ ExecEvalJsonExprSubtrans(JsonFunc func, ExprEvalStep *op,
PG_CATCH();
{
ErrorData *edata;
int ecategory;
/* Save error info in oldcontext */
MemoryContextSwitchTo(oldcontext);
@ -4854,8 +4862,10 @@ ExecEvalJsonExprSubtrans(JsonFunc func, ExprEvalStep *op,
MemoryContextSwitchTo(oldcontext);
CurrentResourceOwner = oldowner;
if (ERRCODE_TO_CATEGORY(edata->sqlerrcode) !=
ERRCODE_DATA_EXCEPTION)
ecategory = ERRCODE_TO_CATEGORY(edata->sqlerrcode);
if (ecategory != ERRCODE_DATA_EXCEPTION && /* jsonpath and other data errors */
ecategory != ERRCODE_INTEGRITY_CONSTRAINT_VIOLATION) /* domain errors */
ReThrowError(edata);
res = (Datum) 0;
@ -4981,6 +4991,10 @@ ExecEvalJsonExpr(ExprEvalStep *op, ExprContext *econtext,
break;
}
case JSON_TABLE_OP:
*resnull = false;
return item;
default:
elog(ERROR, "unrecognized SQL/JSON expression op %d", jexpr->op);
return (Datum) 0;