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Make jsonb casts to scalar types translate JSON null to SQL NULL.
Formerly, these cases threw an error "cannot cast jsonb null to type <whatever>". That seems less than helpful though. It's also inconsistent with the behavior of the ->> operator, which translates JSON null to SQL NULL, as do some other jsonb functions. Discussion: https://postgr.es/m/[email protected]
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3 files changed

+149
-7
lines changed

3 files changed

+149
-7
lines changed

‎src/backend/utils/adt/jsonb.c‎

Lines changed: 70 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -2040,7 +2040,16 @@ jsonb_bool(PG_FUNCTION_ARGS)
20402040
Jsonb *in = PG_GETARG_JSONB_P(0);
20412041
JsonbValue v;
20422042

2043-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvBool)
2043+
if (!JsonbExtractScalar(&in->root, &v))
2044+
cannotCastJsonbValue(v.type, "boolean");
2045+
2046+
if (v.type == jbvNull)
2047+
{
2048+
PG_FREE_IF_COPY(in, 0);
2049+
PG_RETURN_NULL();
2050+
}
2051+
2052+
if (v.type != jbvBool)
20442053
cannotCastJsonbValue(v.type, "boolean");
20452054

20462055
PG_FREE_IF_COPY(in, 0);
@@ -2055,7 +2064,16 @@ jsonb_numeric(PG_FUNCTION_ARGS)
20552064
JsonbValue v;
20562065
Numeric retValue;
20572066

2058-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2067+
if (!JsonbExtractScalar(&in->root, &v))
2068+
cannotCastJsonbValue(v.type, "numeric");
2069+
2070+
if (v.type == jbvNull)
2071+
{
2072+
PG_FREE_IF_COPY(in, 0);
2073+
PG_RETURN_NULL();
2074+
}
2075+
2076+
if (v.type != jbvNumeric)
20592077
cannotCastJsonbValue(v.type, "numeric");
20602078

20612079
/*
@@ -2076,7 +2094,16 @@ jsonb_int2(PG_FUNCTION_ARGS)
20762094
JsonbValue v;
20772095
Datum retValue;
20782096

2079-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2097+
if (!JsonbExtractScalar(&in->root, &v))
2098+
cannotCastJsonbValue(v.type, "smallint");
2099+
2100+
if (v.type == jbvNull)
2101+
{
2102+
PG_FREE_IF_COPY(in, 0);
2103+
PG_RETURN_NULL();
2104+
}
2105+
2106+
if (v.type != jbvNumeric)
20802107
cannotCastJsonbValue(v.type, "smallint");
20812108

20822109
retValue = DirectFunctionCall1(numeric_int2,
@@ -2094,7 +2121,16 @@ jsonb_int4(PG_FUNCTION_ARGS)
20942121
JsonbValue v;
20952122
Datum retValue;
20962123

2097-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2124+
if (!JsonbExtractScalar(&in->root, &v))
2125+
cannotCastJsonbValue(v.type, "integer");
2126+
2127+
if (v.type == jbvNull)
2128+
{
2129+
PG_FREE_IF_COPY(in, 0);
2130+
PG_RETURN_NULL();
2131+
}
2132+
2133+
if (v.type != jbvNumeric)
20982134
cannotCastJsonbValue(v.type, "integer");
20992135

21002136
retValue = DirectFunctionCall1(numeric_int4,
@@ -2112,7 +2148,16 @@ jsonb_int8(PG_FUNCTION_ARGS)
21122148
JsonbValue v;
21132149
Datum retValue;
21142150

2115-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2151+
if (!JsonbExtractScalar(&in->root, &v))
2152+
cannotCastJsonbValue(v.type, "bigint");
2153+
2154+
if (v.type == jbvNull)
2155+
{
2156+
PG_FREE_IF_COPY(in, 0);
2157+
PG_RETURN_NULL();
2158+
}
2159+
2160+
if (v.type != jbvNumeric)
21162161
cannotCastJsonbValue(v.type, "bigint");
21172162

21182163
retValue = DirectFunctionCall1(numeric_int8,
@@ -2130,7 +2175,16 @@ jsonb_float4(PG_FUNCTION_ARGS)
21302175
JsonbValue v;
21312176
Datum retValue;
21322177

2133-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2178+
if (!JsonbExtractScalar(&in->root, &v))
2179+
cannotCastJsonbValue(v.type, "real");
2180+
2181+
if (v.type == jbvNull)
2182+
{
2183+
PG_FREE_IF_COPY(in, 0);
2184+
PG_RETURN_NULL();
2185+
}
2186+
2187+
if (v.type != jbvNumeric)
21342188
cannotCastJsonbValue(v.type, "real");
21352189

21362190
retValue = DirectFunctionCall1(numeric_float4,
@@ -2148,7 +2202,16 @@ jsonb_float8(PG_FUNCTION_ARGS)
21482202
JsonbValue v;
21492203
Datum retValue;
21502204

2151-
if (!JsonbExtractScalar(&in->root, &v) || v.type != jbvNumeric)
2205+
if (!JsonbExtractScalar(&in->root, &v))
2206+
cannotCastJsonbValue(v.type, "double precision");
2207+
2208+
if (v.type == jbvNull)
2209+
{
2210+
PG_FREE_IF_COPY(in, 0);
2211+
PG_RETURN_NULL();
2212+
}
2213+
2214+
if (v.type != jbvNumeric)
21522215
cannotCastJsonbValue(v.type, "double precision");
21532216

21542217
retValue = DirectFunctionCall1(numeric_float8,

‎src/test/regress/expected/jsonb.out‎

Lines changed: 66 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5617,6 +5617,12 @@ select 'true'::jsonb::bool;
56175617
t
56185618
(1 row)
56195619

5620+
select 'null'::jsonb::bool;
5621+
bool
5622+
------
5623+
5624+
(1 row)
5625+
56205626
select '[]'::jsonb::bool;
56215627
ERROR: cannot cast jsonb array to type boolean
56225628
select '1.0'::jsonb::float;
@@ -5625,22 +5631,82 @@ select '1.0'::jsonb::float;
56255631
1
56265632
(1 row)
56275633

5634+
select 'null'::jsonb::float;
5635+
float8
5636+
--------
5637+
5638+
(1 row)
5639+
56285640
select '[1.0]'::jsonb::float;
56295641
ERROR: cannot cast jsonb array to type double precision
5642+
select '1.0'::jsonb::float4;
5643+
float4
5644+
--------
5645+
1
5646+
(1 row)
5647+
5648+
select 'null'::jsonb::float4;
5649+
float4
5650+
--------
5651+
5652+
(1 row)
5653+
5654+
select '[1.0]'::jsonb::float4;
5655+
ERROR: cannot cast jsonb array to type real
5656+
select '12345'::jsonb::int2;
5657+
int2
5658+
-------
5659+
12345
5660+
(1 row)
5661+
5662+
select 'null'::jsonb::int2;
5663+
int2
5664+
------
5665+
5666+
(1 row)
5667+
5668+
select '"hello"'::jsonb::int2;
5669+
ERROR: cannot cast jsonb string to type smallint
56305670
select '12345'::jsonb::int4;
56315671
int4
56325672
-------
56335673
12345
56345674
(1 row)
56355675

5676+
select 'null'::jsonb::int4;
5677+
int4
5678+
------
5679+
5680+
(1 row)
5681+
56365682
select '"hello"'::jsonb::int4;
56375683
ERROR: cannot cast jsonb string to type integer
5684+
select '12345'::jsonb::int8;
5685+
int8
5686+
-------
5687+
12345
5688+
(1 row)
5689+
5690+
select 'null'::jsonb::int8;
5691+
int8
5692+
------
5693+
5694+
(1 row)
5695+
5696+
select '"hello"'::jsonb::int8;
5697+
ERROR: cannot cast jsonb string to type bigint
56385698
select '12345'::jsonb::numeric;
56395699
numeric
56405700
---------
56415701
12345
56425702
(1 row)
56435703

5704+
select 'null'::jsonb::numeric;
5705+
numeric
5706+
---------
5707+
5708+
(1 row)
5709+
56445710
select '{}'::jsonb::numeric;
56455711
ERROR: cannot cast jsonb object to type numeric
56465712
select '12345.05'::jsonb::numeric;

‎src/test/regress/sql/jsonb.sql‎

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1540,12 +1540,25 @@ select ts_headline('[]'::jsonb, tsquery('aaa & bbb'));
15401540

15411541
-- casts
15421542
select 'true'::jsonb::bool;
1543+
select 'null'::jsonb::bool;
15431544
select '[]'::jsonb::bool;
15441545
select '1.0'::jsonb::float;
1546+
select 'null'::jsonb::float;
15451547
select '[1.0]'::jsonb::float;
1548+
select '1.0'::jsonb::float4;
1549+
select 'null'::jsonb::float4;
1550+
select '[1.0]'::jsonb::float4;
1551+
select '12345'::jsonb::int2;
1552+
select 'null'::jsonb::int2;
1553+
select '"hello"'::jsonb::int2;
15461554
select '12345'::jsonb::int4;
1555+
select 'null'::jsonb::int4;
15471556
select '"hello"'::jsonb::int4;
1557+
select '12345'::jsonb::int8;
1558+
select 'null'::jsonb::int8;
1559+
select '"hello"'::jsonb::int8;
15481560
select '12345'::jsonb::numeric;
1561+
select 'null'::jsonb::numeric;
15491562
select '{}'::jsonb::numeric;
15501563
select '12345.05'::jsonb::numeric;
15511564
select '12345.05'::jsonb::float4;

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