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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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27
src/backend/nodes/nodeFuncs.c
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@ -2466,6 +2466,8 @@ expression_tree_walker(Node *node,
return true;
if (walker(tf->coldefexprs, context))
return true;
if (walker(tf->colvalexprs, context))
return true;
}
break;
case T_JsonValueExpr:
@ -3513,6 +3515,7 @@ expression_tree_mutator(Node *node,
MUTATE(newnode->rowexpr, tf->rowexpr, Node *);
MUTATE(newnode->colexprs, tf->colexprs, List *);
MUTATE(newnode->coldefexprs, tf->coldefexprs, List *);
MUTATE(newnode->colvalexprs, tf->colvalexprs, List *);
return (Node *) newnode;
}
break;
@ -4530,6 +4533,30 @@ raw_expression_tree_walker(Node *node,
return true;
}
break;
case T_JsonTable:
{
JsonTable *jt = (JsonTable *) node;
if (walker(jt->common, context))
return true;
if (walker(jt->columns, context))
return true;
}
break;
case T_JsonTableColumn:
{
JsonTableColumn *jtc = (JsonTableColumn *) node;
if (walker(jtc->typeName, context))
return true;
if (walker(jtc->on_empty, context))
return true;
if (walker(jtc->on_error, context))
return true;
if (jtc->coltype == JTC_NESTED && walker(jtc->columns, context))
return true;
}
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(node));