!1989 issue修复：ignore处理json与jsonb类型时，类型零值修正

Merge pull request !1989 from zhangzhixian/issue_fix_json_default

src/gausskernel/runtime/executor/execUtils.cpp

@@ -2508,11 +2508,11 @@ Datum GetTypeZeroValue(Form_pg_attribute att_tup)
             break;
         }
         case JSONOID: {
-            result = (Datum)DirectFunctionCall1(json_in, CStringGetDatum("0"));
+            result = (Datum)DirectFunctionCall1(json_in, CStringGetDatum("null"));
             break;
         }
         case JSONBOID: {
-            result = (Datum)DirectFunctionCall1(jsonb_in, CStringGetDatum("0"));
+            result = (Datum)DirectFunctionCall1(jsonb_in, CStringGetDatum("null"));
             break;
         }
         case XMLOID: {

src/test/regress/expected/ignore/ignore_not_null_constraints.out

@@ -583,9 +583,9 @@ insert /*+ ignore_error */ into t_json values (null);
 WARNING:  null value in column "c" violates not-null constraint
 DETAIL:  Failing row contains (null).
 select * from t_json;
- c 
----
- 0
+  c   
+------
+ null
 (1 row)
 
 insert into t_json values('111');
@@ -595,10 +595,17 @@ DETAIL:  Failing row contains (null).
 WARNING:  null value in column "c" violates not-null constraint
 DETAIL:  Failing row contains (null).
 select * from t_json;
- c 
----
- 0
- 0
+  c   
+------
+ null
+ null
+(2 rows)
+
+select * from t_json where c::text = 'null';
+  c   
+------
+ null
+ null
 (2 rows)
 
 -- jsonb
@@ -607,9 +614,9 @@ insert /*+ ignore_error */ into t_jsonb values (null);
 WARNING:  null value in column "c" violates not-null constraint
 DETAIL:  Failing row contains (null).
 select * from t_jsonb;
- c 
----
- 0
+  c   
+------
+ null
 (1 row)
 
 insert into t_jsonb values('111');
@@ -619,10 +626,17 @@ DETAIL:  Failing row contains (null).
 WARNING:  null value in column "c" violates not-null constraint
 DETAIL:  Failing row contains (null).
 select * from t_jsonb;
- c 
----
- 0
- 0
+  c   
+------
+ null
+ null
+(2 rows)
+
+select * from t_jsonb where c::text = 'null';
+  c   
+------
+ null
+ null
 (2 rows)
 
 -- bit

src/test/regress/sql/ignore/ignore_not_null_constraints.sql

@@ -195,6 +195,7 @@ select * from t_json;
 insert into t_json values('111');
 update /*+ ignore_error */ t_json set c = null;
 select * from t_json;
+select * from t_json where c::text = 'null';
 
 -- jsonb
 create table t_jsonb(c jsonb not null);
@@ -203,6 +204,7 @@ select * from t_jsonb;
 insert into t_jsonb values('111');
 update /*+ ignore_error */ t_jsonb set c = null;
 select * from t_jsonb;
+select * from t_jsonb where c::text = 'null';
 
 -- bit
 create table t_bit(c bit not null);