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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
Download Patch File Download Diff File Expand all files Collapse all files

65
src/backend/nodes/equalfuncs.c
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@@ -127,6 +127,7 @@ _equalRangeVar(const RangeVar *a, const RangeVar *b)
static bool
_equalTableFunc(const TableFunc *a, const TableFunc *b)
{
COMPARE_SCALAR_FIELD(functype);
COMPARE_NODE_FIELD(ns_uris);
COMPARE_NODE_FIELD(ns_names);
COMPARE_NODE_FIELD(docexpr);
@@ -137,13 +138,65 @@ _equalTableFunc(const TableFunc *a, const TableFunc *b)
COMPARE_NODE_FIELD(colcollations);
COMPARE_NODE_FIELD(colexprs);
COMPARE_NODE_FIELD(coldefexprs);
COMPARE_NODE_FIELD(colvalexprs);
COMPARE_BITMAPSET_FIELD(notnulls);
COMPARE_NODE_FIELD(plan);
COMPARE_SCALAR_FIELD(ordinalitycol);
COMPARE_LOCATION_FIELD(location);
return true;
}
static bool
_equalJsonTable(const JsonTable *a, const JsonTable *b)
{
COMPARE_NODE_FIELD(common);
COMPARE_NODE_FIELD(columns);
COMPARE_NODE_FIELD(on_error);
COMPARE_NODE_FIELD(alias);
COMPARE_SCALAR_FIELD(location);
return true;
}
static bool
_equalJsonTableColumn(const JsonTableColumn *a, const JsonTableColumn *b)
{
COMPARE_SCALAR_FIELD(coltype);
COMPARE_STRING_FIELD(name);
COMPARE_NODE_FIELD(typeName);
COMPARE_STRING_FIELD(pathspec);
COMPARE_SCALAR_FIELD(format);
COMPARE_SCALAR_FIELD(wrapper);
COMPARE_SCALAR_FIELD(omit_quotes);
COMPARE_NODE_FIELD(columns);
COMPARE_NODE_FIELD(on_empty);
COMPARE_NODE_FIELD(on_error);
COMPARE_SCALAR_FIELD(location);
return true;
}
static bool
_equalJsonTableParent(const JsonTableParent *a, const JsonTableParent *b)
{
COMPARE_NODE_FIELD(path);
COMPARE_NODE_FIELD(child);
COMPARE_SCALAR_FIELD(colMin);
COMPARE_SCALAR_FIELD(colMax);
return true;
}
static bool
_equalJsonTableSibling(const JsonTableSibling *a, const JsonTableSibling *b)
{
COMPARE_NODE_FIELD(larg);
COMPARE_NODE_FIELD(rarg);
return true;
}
static bool
_equalIntoClause(const IntoClause *a, const IntoClause *b)
{
@@ -3719,6 +3772,12 @@ equal(const void *a, const void *b)
case T_JsonItemCoercions:
retval = _equalJsonItemCoercions(a, b);
break;
case T_JsonTableParent:
retval = _equalJsonTableParent(a, b);
break;
case T_JsonTableSibling:
retval = _equalJsonTableSibling(a, b);
break;
/*
* RELATION NODES
@@ -4341,6 +4400,12 @@ equal(const void *a, const void *b)
case T_JsonArgument:
retval = _equalJsonArgument(a, b);
break;
case T_JsonTable:
retval = _equalJsonTable(a, b);
break;
case T_JsonTableColumn:
retval = _equalJsonTableColumn(a, b);
break;
default:
elog(ERROR, "unrecognized node type: %d",