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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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29
src/backend/nodes/outfuncs.c
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@@ -1092,6 +1092,7 @@ _outTableFunc(StringInfo str, const TableFunc *node)
{
WRITE_NODE_TYPE("TABLEFUNC");
WRITE_ENUM_FIELD(functype, TableFuncType);
WRITE_NODE_FIELD(ns_uris);
WRITE_NODE_FIELD(ns_names);
WRITE_NODE_FIELD(docexpr);
@@ -1102,7 +1103,9 @@ _outTableFunc(StringInfo str, const TableFunc *node)
WRITE_NODE_FIELD(colcollations);
WRITE_NODE_FIELD(colexprs);
WRITE_NODE_FIELD(coldefexprs);
WRITE_NODE_FIELD(colvalexprs);
WRITE_BITMAPSET_FIELD(notnulls);
WRITE_NODE_FIELD(plan);
WRITE_INT_FIELD(ordinalitycol);
WRITE_LOCATION_FIELD(location);
}
@@ -1866,6 +1869,26 @@ _outJsonItemCoercions(StringInfo str, const JsonItemCoercions *node)
WRITE_NODE_FIELD(composite);
}
static void
_outJsonTableParent(StringInfo str, const JsonTableParent *node)
{
WRITE_NODE_TYPE("JSONTABPNODE");
WRITE_NODE_FIELD(path);
WRITE_NODE_FIELD(child);
WRITE_INT_FIELD(colMin);
WRITE_INT_FIELD(colMax);
}
static void
_outJsonTableSibling(StringInfo str, const JsonTableSibling *node)
{
WRITE_NODE_TYPE("JSONTABSNODE");
WRITE_NODE_FIELD(larg);
WRITE_NODE_FIELD(rarg);
}
/*****************************************************************************
*
* Stuff from pathnodes.h.
@@ -4714,6 +4737,12 @@ outNode(StringInfo str, const void *obj)
case T_JsonItemCoercions:
_outJsonItemCoercions(str, obj);
break;
case T_JsonTableParent:
_outJsonTableParent(str, obj);
break;
case T_JsonTableSibling:
_outJsonTableSibling(str, obj);
break;
default: