SAP HANA Predictive Analysis Library (PAL)

2. The records in the signature table must follow this order: first input table types, next parameter table
type, and then output table types.
3. The signature table must be created before generating the PAL procedure. The table type names are
user-defined. You can find detailed table type definitions for each PAL function in Chapter 3.
4. The names of all the generated procedures and the procedure parameter table types must be unique.
The procedure names are defined by users. When generating a PAL procedure, make sure you give a
unique procedure name.
5. If you want to drop an existing procedure and then generate it again, you need to call the
SYS.AFLLANG_WRAPPER_PROCEDURE_DROP procedure to clear the existing procedure. The syntax is
as follows:
CALL SYS.AFLLANG_WRAPPER_PROCEDURE_DROP('','');
6. The PAL procedure can be created under any schema once you have the CREATE ANY privileges of it.
7. The current PAL does not support the decimal data type. If you have decimal columns in the base tables
and want them to be replaced by double in the generated table types, you need to add the following
entry in the signature table:
(-2, '_SYS_AFL', 'CAST_DECIMAL_TO_DOUBLE', 'INOUT');
(-1, '_SYS_AFL', 'CREATE_TABLE_TYPES', 'INOUT');
Then the real tables or types should be inserted starting with ID1, as shown below:
Table 2:
Position Schema Name Table Type Name Parameter Type
-2 _SYS_AFL CAST_DECIMAL_TO_DOU­
BLE
INOUT
-1 _SYS_AFL CREATE_TABLE_TYPES INOUT
1 IN
2
IN
3 OUT
The implicit decimal-to-double conversion is done on SQL layer when a generated procedure with
tables including decimal columns is called. Note that the PAL data precision will NOT be higher than
double.
8. The AFLLANG procedure generator described in this Step was introduced since SAP HANA SPS 09. For
backward compatibility information, see SAP Note 2046767.
Step 2 – Call a PAL Procedure
After generating a PAL procedure, any user that has the AFL__SYS_AFL_AFLPAL_EXECUTE or
AFL__SYS_AFL_AFLPAL_EXECUTE_WITH_GRANT_OPTION role can call the procedure, using the syntax
below.
CALL .(
{,…},
,
{,…}) with overview;
10 P U B L I C
SAP HANA Predictive Analysis Library (PAL)
Getting Started with PAL