- Fix to MDEV-9542 Connect was not handling NULLs in the answer

from catalog functions and tables. It does now and when decimal is NULL defines DOUBLE without parameters. modified: storage/connect/ha_connect.cc modified: storage/connect/mysql-test/connect/r/odbc.result modified: storage/connect/mysql-test/connect/r/odbc_oracle.result modified: storage/connect/mysql-test/connect/r/odbc_postgresql.result modified: storage/connect/mysql-test/connect/r/odbc_sqlite3.result modified: storage/connect/mysql-test/connect/r/odbc_xls.result modified: storage/connect/odbconn.cpp modified: storage/connect/table.cpp modified: storage/connect/valblk.h
MariaDB · Feb 15, 2016 · 481e643 · 481e643
1 parent 62a5e56
commit 481e643
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Showing 10 changed files with 2,520 additions and 2,490 deletions.
diff --git a/storage/connect/ha_connect.cc b/storage/connect/ha_connect.cc
@@ -4926,11 +4926,11 @@ static bool add_field(String *sql, const char *field_name, int typ, int len,
   error|= sql->append("` ");
   error|= sql->append(type);
 
-  if (len && typ != TYPE_DATE) {
+	if (len && typ != TYPE_DATE && (typ != TYPE_DOUBLE || dec >= 0)) {
     error|= sql->append('(');
     error|= sql->append_ulonglong(len);
 
-    if (!strcmp(type, "DOUBLE")) {
+		if (typ == TYPE_DOUBLE) {
       error|= sql->append(',');
       // dec must be < len and < 31
       error|= sql->append_ulonglong(MY_MIN(dec, (MY_MIN(len, 31) - 1)));
@@ -5516,16 +5516,17 @@ static int connect_assisted_discovery(handlerton *, THD* thd,
         dec= crp->Prec;
         flg= crp->Flag;
         v= crp->Var;
+				tm= (crp->Kdata->IsNullable()) ? 0 : NOT_NULL_FLAG;
 
         if (!len && typ == TYPE_STRING)
           len= 256;      // STRBLK's have 0 length
 
         // Now add the field
 #if defined(NEW_WAY)
         rc= add_fields(g, thd, &alter_info, cnm, typ, len, dec,
-                       NOT_NULL_FLAG, "", flg, dbf, v);
+                       tm, "", flg, dbf, v);
 #else   // !NEW_WAY
-        if (add_field(&sql, cnm, typ, len, dec, NULL, NOT_NULL_FLAG,
+        if (add_field(&sql, cnm, typ, len, dec, NULL, tm,
                       NULL, NULL, NULL, NULL, flg, dbf, v))
           rc= HA_ERR_OUT_OF_MEM;
 #endif  // !NEW_WAY
@@ -5582,7 +5583,7 @@ static int connect_assisted_discovery(handlerton *, THD* thd,
               len= crp->Kdata->GetIntValue(i);
               break;
             case FLD_SCALE:
-              dec= crp->Kdata->GetIntValue(i);
+							dec = (!crp->Kdata->IsNull(i)) ? crp->Kdata->GetIntValue(i) : -1;
               break;
             case FLD_NULL:
               if (crp->Kdata->GetIntValue(i))
@@ -5675,14 +5676,14 @@ static int connect_assisted_discovery(handlerton *, THD* thd,
               dec= 0;
             } // endswitch typ
 
-          } // endif ttp
+        } else
 #endif   // ODBC_SUPPORT
-
         // Make the arguments as required by add_fields
-        if (typ == TYPE_DATE)
+				if (typ == TYPE_DOUBLE)
+					prec= len;
+
+				if (typ == TYPE_DATE)
           prec= 0;
-        else if (typ == TYPE_DOUBLE)
-          prec= len;
 
         // Now add the field
 #if defined(NEW_WAY)

diff --git a/storage/connect/mysql-test/connect/r/odbc.result b/storage/connect/mysql-test/connect/r/odbc.result
@@ -5,43 +5,43 @@ SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `Name` varchar(256) NOT NULL,
-  `Description` varchar(256) NOT NULL
+  `Description` varchar(256) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 `TABLE_TYPE`='ODBC' `CATFUNC`='Sources'
 DROP TABLE t1;
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CATFUNC=Drivers;
 SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `Description` char(128) NOT NULL,
-  `Attributes` varchar(256) NOT NULL
+  `Attributes` varchar(256) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 `TABLE_TYPE`='ODBC' `CATFUNC`='Drivers'
 DROP TABLE t1;
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CATFUNC=Tables CONNECTION='Not important';
 SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `Table_Cat` char(128) NOT NULL,
-  `Table_Schema` char(128) NOT NULL,
+  `Table_Cat` char(128) DEFAULT NULL,
+  `Table_Schema` char(128) DEFAULT NULL,
   `Table_Name` char(128) NOT NULL,
   `Table_Type` char(16) NOT NULL,
-  `Remark` char(255) NOT NULL
+  `Remark` char(255) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='Not important' `TABLE_TYPE`='ODBC' `CATFUNC`='Tables'
 DROP TABLE t1;
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CATFUNC=Columns CONNECTION='Not important';
 SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `Table_Cat` char(128) NOT NULL,
-  `Table_Schema` char(128) NOT NULL,
+  `Table_Cat` char(128) DEFAULT NULL,
+  `Table_Schema` char(128) DEFAULT NULL,
   `Table_Name` char(128) NOT NULL,
   `Column_Name` char(128) NOT NULL,
   `Data_Type` smallint(6) NOT NULL,
   `Type_Name` char(30) NOT NULL,
   `Column_Size` int(10) NOT NULL,
   `Buffer_Length` int(10) NOT NULL,
-  `Decimal_Digits` smallint(6) NOT NULL,
-  `Radix` smallint(6) NOT NULL,
+  `Decimal_Digits` smallint(6) DEFAULT NULL,
+  `Radix` smallint(6) DEFAULT NULL,
   `Nullable` smallint(6) NOT NULL,
-  `Remarks` char(255) NOT NULL
+  `Remarks` char(255) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='Not important' `TABLE_TYPE`='ODBC' `CATFUNC`='Columns'
 DROP TABLE t1;
diff --git a/storage/connect/mysql-test/connect/r/odbc_oracle.result b/storage/connect/mysql-test/connect/r/odbc_oracle.result
@@ -1,7 +1,7 @@
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `Name` varchar(256) NOT NULL,
-  `Description` varchar(256) NOT NULL
+  `Description` varchar(256) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 `TABLE_TYPE`='ODBC' `CATFUNC`='Sources'
 SET NAMES utf8;
 #
@@ -14,53 +14,53 @@ TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables;
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
-	MTR	T2	TABLE	
-	MTR	V1	VIEW	
+NULL	MTR	T1	TABLE	NULL
+NULL	MTR	T2	TABLE	NULL
+NULL	MTR	V1	VIEW	NULL
 DROP TABLE t1;
 # All tables in all schemas (filtered with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT
 TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables TABNAME='%.%';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
-	MTR	T2	TABLE	
-	MTR	V1	VIEW	
+NULL	MTR	T1	TABLE	NULL
+NULL	MTR	T2	TABLE	NULL
+NULL	MTR	V1	VIEW	NULL
 DROP TABLE t1;
 # All tables "T1" in all schemas (filtered with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT
 TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables TABNAME='%.T1';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
+NULL	MTR	T1	TABLE	NULL
 DROP TABLE t1;
 # All tables "T1" in all schemas (filtered with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT
 TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables TABNAME='T1';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
+NULL	MTR	T1	TABLE	NULL
 DROP TABLE t1;
 # Table "T1" in the schema "MTR"
 CREATE TABLE t1 ENGINE=CONNECT
 TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables TABNAME='MTR.T1';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
+NULL	MTR	T1	TABLE	NULL
 DROP TABLE t1;
 # All tables in the schema "MTR"
 CREATE TABLE t1 ENGINE=CONNECT
 TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr'
 CATFUNC=Tables TABNAME='MTR.%';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Table_Type	Remark
-	MTR	T1	TABLE	
-	MTR	T2	TABLE	
-	MTR	V1	VIEW	
+NULL	MTR	T1	TABLE	NULL
+NULL	MTR	T2	TABLE	NULL
+NULL	MTR	V1	VIEW	NULL
 DROP TABLE t1;
 #
 # Checking CATFUNC=Columns
@@ -73,10 +73,10 @@ CATFUNC=Columns;
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 	MTR	T1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	T1	B	6	NUMBER	38	40	0	0	1	
-	MTR	T2	A	12	VARCHAR2	64	64	0	0	1	
+	MTR	T1	B	6	NUMBER	38	40	NULL	NULL	1	
+	MTR	T2	A	12	VARCHAR2	64	64	NULL	NULL	1	
 	MTR	V1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	V1	B	6	NUMBER	38	40	0	0	1	
+	MTR	V1	B	6	NUMBER	38	40	NULL	NULL	1	
 DROP TABLE t1;
 # All columns in all schemas (limited with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT
@@ -85,17 +85,17 @@ CATFUNC=Columns TABNAME='%.%';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 	MTR	T1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	T1	B	6	NUMBER	38	40	0	0	1	
-	MTR	T2	A	12	VARCHAR2	64	64	0	0	1	
+	MTR	T1	B	6	NUMBER	38	40	NULL	NULL	1	
+	MTR	T2	A	12	VARCHAR2	64	64	NULL	NULL	1	
 	MTR	V1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	V1	B	6	NUMBER	38	40	0	0	1	
+	MTR	V1	B	6	NUMBER	38	40	NULL	NULL	1	
 DROP TABLE t1;
 # All tables "T1" in all schemas (limited with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='%.T1';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 	MTR	T1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	T1	B	6	NUMBER	38	40	0	0	1	
+	MTR	T1	B	6	NUMBER	38	40	NULL	NULL	1	
 DROP TABLE t1;
 # Table "T1" in the schema "MTR"
 CREATE TABLE t1 ENGINE=CONNECT
@@ -104,7 +104,7 @@ CATFUNC=Columns TABNAME='MTR.T1';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 	MTR	T1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	T1	B	6	NUMBER	38	40	0	0	1	
+	MTR	T1	B	6	NUMBER	38	40	NULL	NULL	1	
 DROP TABLE t1;
 # All tables "T1" in all schemas (filtered with WHERE)
 CREATE TABLE t1 ENGINE=CONNECT
@@ -113,7 +113,7 @@ CATFUNC=Columns TABNAME='%.T1';
 SELECT * FROM t1 WHERE Table_Schema='MTR' ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 	MTR	T1	A	3	DECIMAL	38	40	0	10	1	
-	MTR	T1	B	6	NUMBER	38	40	0	0	1	
+	MTR	T1	B	6	NUMBER	38	40	NULL	NULL	1	
 DROP TABLE t1;
 #
 # Checking tables
@@ -127,32 +127,32 @@ SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `A` decimal(40,0) DEFAULT NULL,
-  `B` double(40,0) DEFAULT NULL
+  `B` double DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr' `TABLE_TYPE`='ODBC' `TABNAME`='T1'
 SELECT * FROM t1 ORDER BY A;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 CREATE TABLE t2 AS SELECT * FROM t1;
 SHOW CREATE TABLE t2;
 Table	Create Table
 t2	CREATE TABLE `t2` (
   `A` decimal(40,0) DEFAULT NULL,
-  `B` double(40,0) DEFAULT NULL
+  `B` double DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 SELECT * FROM t2;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 DROP TABLE t2;
 CREATE VIEW v1 AS SELECT * FROM t1;
 SELECT * FROM v1;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 DROP VIEW v1;
 DROP TABLE t1;
 # Table "T1" in the schema "MTR"
@@ -163,13 +163,13 @@ SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `A` decimal(40,0) DEFAULT NULL,
-  `B` double(40,0) DEFAULT NULL
+  `B` double DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr' `TABLE_TYPE`='ODBC' `TABNAME`='MTR.T1'
 SELECT * FROM t1;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 DROP TABLE t1;
 # View "V1" in the schema "MTR"
 CREATE TABLE t1 ENGINE=CONNECT
@@ -179,32 +179,32 @@ SHOW CREATE TABLE t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `A` decimal(40,0) DEFAULT NULL,
-  `B` double(40,0) DEFAULT NULL
+  `B` double DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 CONNECTION='DSN=ConnectEngineOracle;UID=mtr;PWD=mtr' `TABLE_TYPE`='ODBC' `TABNAME`='MTR.V1'
 SELECT * FROM t1;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 CREATE TABLE t2 AS SELECT * FROM t1;
 SHOW CREATE TABLE t2;
 Table	Create Table
 t2	CREATE TABLE `t2` (
   `A` decimal(40,0) DEFAULT NULL,
-  `B` double(40,0) DEFAULT NULL
+  `B` double DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 SELECT * FROM t2;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 DROP TABLE t2;
 CREATE VIEW v1 AS SELECT * FROM t1;
 SELECT * FROM v1;
 A	B
 10	1000000000
 20	1000000000000
-30	1000000000000000
+30	1e15
 DROP VIEW v1;
 DROP TABLE t1;
 # Table "T2" in the schema "MTR"

diff --git a/storage/connect/mysql-test/connect/r/odbc_postgresql.result b/storage/connect/mysql-test/connect/r/odbc_postgresql.result
@@ -1,7 +1,7 @@
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `Name` varchar(256) NOT NULL,
-  `Description` varchar(256) NOT NULL
+  `Description` varchar(256) DEFAULT NULL
 ) ENGINE=CONNECT DEFAULT CHARSET=latin1 `TABLE_TYPE`='ODBC' `CATFUNC`='Sources'
 SET NAMES utf8;
 #
@@ -99,9 +99,9 @@ Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Bu
 mtr	public	t1	a	4	int4	10	4	0	10	0	
 mtr	public	t2	a	4	int4	10	4	0	10	0	
 mtr	public	v1	a	4	int4	10	4	0	10	1	
-mtr	schema1	t1	a	1	bpchar	10	60	0	0	0	
-mtr	schema1	t2	a	1	bpchar	10	60	0	0	0	
-mtr	schema1	v1	a	1	bpchar	10	60	0	0	1	
+mtr	schema1	t1	a	1	bpchar	10	60	NULL	NULL	0	
+mtr	schema1	t2	a	1	bpchar	10	60	NULL	NULL	0	
+mtr	schema1	v1	a	1	bpchar	10	60	NULL	NULL	1	
 DROP TABLE t1;
 # All columns in the schemas "public" and "schema1"
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEnginePostgresql;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='%.%.%';
@@ -110,16 +110,16 @@ Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Bu
 mtr	public	t1	a	4	int4	10	4	0	10	0	
 mtr	public	t2	a	4	int4	10	4	0	10	0	
 mtr	public	v1	a	4	int4	10	4	0	10	1	
-mtr	schema1	t1	a	1	bpchar	10	60	0	0	0	
-mtr	schema1	t2	a	1	bpchar	10	60	0	0	0	
-mtr	schema1	v1	a	1	bpchar	10	60	0	0	1	
+mtr	schema1	t1	a	1	bpchar	10	60	NULL	NULL	0	
+mtr	schema1	t2	a	1	bpchar	10	60	NULL	NULL	0	
+mtr	schema1	v1	a	1	bpchar	10	60	NULL	NULL	1	
 DROP TABLE t1;
 # All tables "t1" in all schemas
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEnginePostgresql;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='%.%.t1';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 mtr	public	t1	a	4	int4	10	4	0	10	0	
-mtr	schema1	t1	a	1	bpchar	10	60	0	0	0	
+mtr	schema1	t1	a	1	bpchar	10	60	NULL	NULL	0	
 DROP TABLE t1;
 # Table "t1" in the schema "public"
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEnginePostgresql;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='%.public.t1';
@@ -131,14 +131,14 @@ DROP TABLE t1;
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEnginePostgresql;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='%.schema1.t1';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
-mtr	schema1	t1	a	1	bpchar	10	60	0	0	0	
+mtr	schema1	t1	a	1	bpchar	10	60	NULL	NULL	0	
 DROP TABLE t1;
 # All tables "t1" in all schemas (Catalog name is ignored by PostgreSQL)
 CREATE TABLE t1 ENGINE=CONNECT TABLE_TYPE=ODBC CONNECTION='DSN=ConnectEnginePostgresql;UID=mtr;PWD=mtr' CATFUNC=Columns TABNAME='xxx.%.t1';
 SELECT * FROM t1 ORDER BY Table_Schema, Table_Name;
 Table_Cat	Table_Schema	Table_Name	Column_Name	Data_Type	Type_Name	Column_Size	Buffer_Length	Decimal_Digits	Radix	Nullable	Remarks
 mtr	public	t1	a	4	int4	10	4	0	10	0	
-mtr	schema1	t1	a	1	bpchar	10	60	0	0	0	
+mtr	schema1	t1	a	1	bpchar	10	60	NULL	NULL	0	
 DROP TABLE t1;
 #
 # Checking tables