!927 在（+）表示的外连接中支持is null

Merge pull request !927 from scarbor_fair/is_null

src/common/backend/parser/parse_compatibility.cpp

@@ -143,7 +143,7 @@ static void insert_jointerm(OperatorPlusProcessContext* ctx, Expr* expr, RangeTb
     ListCell* lc = NULL;
     JoinTerm* jterm = NULL;
 
-    Assert(IsA(expr, A_Expr));
+    Assert(IsA(expr, A_Expr) || IsA(expr, NullTest));
 
     /* lrte is the RTE with operator "(+)", it couldn't be NULL */
     Assert(lrte != NULL);
@@ -567,8 +567,8 @@ bool plus_outerjoin_precheck(const OperatorPlusProcessContext* ctx, Node* expr,
         return false;
     }
 
-    /* Only support A_Expr with "(+)" for now */
+    /* Only support A_Expr and NullTest with "(+)" for now */
-    if (list_length(lhasplus) && !IsA(expr, A_Expr)) {
+    if (list_length(lhasplus) && !IsA(expr, A_Expr) && !IsA(expr, NullTest)) {
         ereport(
             ERROR, (errcode(ERRCODE_SYNTAX_ERROR), errmsg("Operator \"(+)\" can only be used in common expression.")));
     }

src/test/regress/expected/a_outerjoin_conversion.out

@@ -4,11 +4,15 @@ create table t11(c1 int, c2 int, c3 int);
 create table t12(c1 int, c2 int, c3 int);
 create table t13(c1 int, c2 int, c3 int);
 create table t14(A4 int, B4 int, c4 int);
+create table t_a (id int, name varchar(10), code int);
+create table t_b (id int, name varchar(10), code int);
 -- insert base
 insert into t11 select v,v,v from generate_series(1,10) as v;
 insert into t12 select * from t11;
 insert into t13 select * from t11;
 insert into t14 select v,v,v from generate_series(1,30) as v;
+insert into t_a values (1, 'tom', 3);
+insert into t_b values (1, 'bat', 6);
 -- insert t11 t12, t13's not match values
 insert into t11 select v,v,v from generate_series(11,15) as v;
 insert into t12 select v,v,v from generate_series(16,20) as v;
@@ -1463,9 +1467,28 @@ select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t1
 
 -------used (+) with un common expression, like is null, is not null--------
 select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t11.c3 = t13.c1(+) and t13.c2(+) is not null;
-ERROR:  Operator "(+)" can only be used in common expression.
+ c1 | c2 | c2 
+----+----+----
+  1 |  1 |  1
+  2 |  2 |  2
+  3 |  3 |  3
+  4 |  4 |  4
+  5 |  5 |  5
+  6 |  6 |  6
+  7 |  7 |  7
+  8 |  8 |  8
+  9 |  9 |  9
+ 10 | 10 | 10
+(10 rows)
+
 select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t11.c3 = t13.c1(+) and (t13.c2(+) > t12.c1)::bool;
 ERROR:  Operator "(+)" can only be used in common expression.
+select * from t_a a,t_b b where b.id=a.id(+) and a.code(+) + 1 * 2 + a.code(+) IS NOT NULL ;
+ id | name | code | id | name | code 
+----+------+------+----+------+------
+  1 | tom  |    3 |  1 | bat  |    6
+(1 row)
+
 drop view plus_v;
 drop function plus_join_test_1();
 drop table t1;
@@ -1475,4 +1498,6 @@ drop table t12;
 drop table t13;
 drop table t14;
 drop table t15;
+drop table t_a;
+drop table t_b;
 drop schema plus_outerjoin;

src/test/regress/sql/a_outerjoin_conversion.sql

@@ -4,12 +4,16 @@ create table t11(c1 int, c2 int, c3 int);
 create table t12(c1 int, c2 int, c3 int);
 create table t13(c1 int, c2 int, c3 int);
 create table t14(A4 int, B4 int, c4 int);
+create table t_a (id int, name varchar(10), code int);
+create table t_b (id int, name varchar(10), code int);
 
 -- insert base
 insert into t11 select v,v,v from generate_series(1,10) as v;
 insert into t12 select * from t11;
 insert into t13 select * from t11;
 insert into t14 select v,v,v from generate_series(1,30) as v;
+insert into t_a values (1, 'tom', 3);
+insert into t_b values (1, 'bat', 6);
 
 -- insert t11 t12, t13's not match values
 insert into t11 select v,v,v from generate_series(11,15) as v;
@@ -357,6 +361,7 @@ select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t1
 -------used (+) with un common expression, like is null, is not null--------
 select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t11.c3 = t13.c1(+) and t13.c2(+) is not null;
 select t11.c1, t12.c2, t13.c2 from t11, t12, t13 where t11.c2 = t12.c3(+) and t11.c3 = t13.c1(+) and (t13.c2(+) > t12.c1)::bool;
+select * from t_a a,t_b b where b.id=a.id(+) and a.code(+) + 1 * 2 + a.code(+) IS NOT NULL ;
 
 drop view plus_v;
 drop function plus_join_test_1();
@@ -367,4 +372,6 @@ drop table t12;
 drop table t13;
 drop table t14;
 drop table t15;
+drop table t_a;
+drop table t_b;
 drop schema plus_outerjoin;