Bug#51347: assertion with show create table + partition by columns

on decimal column

The problem was that there was no check to disallow DECIMAL
columns in the code (it was accepted as if it was INTEGER).

Solution was to correctly disallow DECIMAL columns in
COLUMNS partitioning. As documented.

mysql-test/r/partition_column.result

 drop table if exists t1;
+CREATE TABLE t1 (a DECIMAL)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0));
+ERROR HY000: Field 'a' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (a BLOB)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN ("X"));
+ERROR HY000: A BLOB field is not allowed in partition function
+CREATE TABLE t1 (a TEXT)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN ("X"));
+ERROR HY000: A BLOB field is not allowed in partition function
+CREATE TABLE t1 (a FLOAT)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0.0));
+ERROR HY000: Field 'a' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (a DOUBLE)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0.0));
+ERROR HY000: Field 'a' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (d TIMESTAMP)
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ('2000-01-01'),
+PARTITION p1 VALUES LESS THAN ('2040-01-01'));
+ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (d BIT(1))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN (0),
+PARTITION p1 VALUES LESS THAN (1));
+ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (d ENUM("YES","NO"))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ("NO"),
+PARTITION p1 VALUES LESS THAN (MAXVALUE));
+ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
+CREATE TABLE t1 (d SET("Car","MC"))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ("MC"),
+PARTITION p1 VALUES LESS THAN (MAXVALUE));
+ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
 create table t1 (a int, b int)
 partition by range columns (a,b)
 ( partition p0 values less than (maxvalue, 10),
@@ -430,16 +470,6 @@ partition by range columns(d)
 ( partition p0 values less than ('2000-01-01'),
 partition p1 values less than ('2040-01-01'));
 ERROR HY000: Partition column values of incorrect type
-create table t1 (d timestamp)
-partition by range columns(d)
-( partition p0 values less than ('2000-01-01'),
-partition p1 values less than ('2040-01-01'));
-ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
-create table t1 (d bit(1))
-partition by range columns(d)
-( partition p0 values less than (0),
-partition p1 values less than (1));
-ERROR HY000: Field 'd' is of a not allowed type for this type of partitioning
 create table t1 (a int, b int)
 partition by range columns(a,b)
 (partition p0 values less than (maxvalue, 10));

mysql-test/t/partition_column.test

@@ -8,6 +8,59 @@
 drop table if exists t1;
 --enable_warnings
 
+#
+# Bug#51347: assertion with show create table + partition by columns
+# on decimal column
+#
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (a DECIMAL)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0));
+
+--error ER_BLOB_FIELD_IN_PART_FUNC_ERROR
+CREATE TABLE t1 (a BLOB)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN ("X"));
+
+--error ER_BLOB_FIELD_IN_PART_FUNC_ERROR
+CREATE TABLE t1 (a TEXT)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN ("X"));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (a FLOAT)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0.0));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (a DOUBLE)
+PARTITION BY RANGE COLUMNS (a)
+(PARTITION p0 VALUES LESS THAN (0.0));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (d TIMESTAMP)
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ('2000-01-01'),
+ PARTITION p1 VALUES LESS THAN ('2040-01-01'));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (d BIT(1))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN (0),
+ PARTITION p1 VALUES LESS THAN (1));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (d ENUM("YES","NO"))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ("NO"),
+ PARTITION p1 VALUES LESS THAN (MAXVALUE));
+
+--error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
+CREATE TABLE t1 (d SET("Car","MC"))
+PARTITION BY RANGE COLUMNS(d)
+(PARTITION p0 VALUES LESS THAN ("MC"),
+ PARTITION p1 VALUES LESS THAN (MAXVALUE));
+
 #
 # BUG#49180, Possible to define empty intervals for column list partitioning
 #
@@ -285,18 +338,6 @@ partition by range columns(d)
 ( partition p0 values less than ('2000-01-01'),
   partition p1 values less than ('2040-01-01'));
 
---error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
-create table t1 (d timestamp)
-partition by range columns(d)
-( partition p0 values less than ('2000-01-01'),
-  partition p1 values less than ('2040-01-01'));
-
---error ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD
-create table t1 (d bit(1))
-partition by range columns(d)
-( partition p0 values less than (0),
-  partition p1 values less than (1));
-
 create table t1 (a int, b int)
 partition by range columns(a,b)
 (partition p0 values less than (maxvalue, 10));

sql/sql_partition.cc

@@ -2128,8 +2128,6 @@ static int check_part_field(enum_field_types sql_type,
   }
   switch (sql_type)
   {
-    case MYSQL_TYPE_NEWDECIMAL:
-    case MYSQL_TYPE_DECIMAL:
     case MYSQL_TYPE_TINY:
     case MYSQL_TYPE_SHORT:
     case MYSQL_TYPE_LONG:
@@ -2151,6 +2149,8 @@ static int check_part_field(enum_field_types sql_type,
       *result_type= STRING_RESULT;
       *need_cs_check= TRUE;
       return FALSE;
+    case MYSQL_TYPE_NEWDECIMAL:
+    case MYSQL_TYPE_DECIMAL:
     case MYSQL_TYPE_TIMESTAMP:
     case MYSQL_TYPE_NULL:
     case MYSQL_TYPE_FLOAT: