RDB$FUNCTION ARGUMENTS

RDB$FUNCTION_ARGUMENTS defines the attributes of a function argument.

Column name	Data type	Length	Description
`RDB$FUNCTION_NAME`	`CHAR`	67	Unique name of the function with which the argument is associated; must correspond to a function name in `RDB$FUNCTIONS`
`RDB$ARGUMENT_POSITION`	`SMALLINT`		Position of the argument described in the `RDB$FUNCTION_NAME` column in relation to the other arguments
`RDB$MECHANISM`	`SMALLINT`		Specifies whether the argument is passed by value (value of 0) or by reference (value of 1)
`RDB$FIELD_TYPE`	`SMALLINT`		Data type of the argument being defined Valid values are: `BLOB` - 261 `BLOB_ID` - 45 `BOOLEAN` - 17 `CHAR` - 14 `CSTRING` - 40 `D_FLOAT` - 11 `DOUBLE` - 27 `FLOAT` - 10 `INT64` - 16 `INTEGER` - 8 `QUAD` - 9 `SMALLINT` - 7 `DATE` - 12 (dialect 3 `DATE`) `TIME` - 13 `TIMESTAMP` - 35 `VARCHAR` - 37
`RDB$FIELD_SCALE`	`SMALLINT`		Scale factor for an argument that has an integer data type; the scale factor is the power of 10 by which the integer is multiplied
`RDB$FIELD_LENGTH`	`SMALLINT`		The length of the argument defined in this row Valid column lengths are: `BLOB` - 8 `BOOLEAN` - 2 `D_FLOAT` - 8 `DATE` - 4 `DOUBLE` - 8 `FLOAT` - 4 `INT64` - 8 `LONG` - 4 `QUAD` - 8 `SHORT` - 2 `TIME` - 4 `TIMESTAMP` - 8
`RDB$FIELD_SUB_TYPE`	`SMALLINT`		If `RDB$FIELD_TYPE` is 7 (`SMALLINT),`8 (`INTEGER),` or 16 (`INT64`) the subtype can be: 0 or `NULL` - `RDB$FIELD_TYPE` 1 - `NUMERIC` 2 - `DECIMAL`
`RDB$CHARACTER_SET_ID`	`SMALLINT`		Unique numeric identifier for a character set
`RDB$FIELD_PRECISION`	`SMALLINT`		The declared precision of the `DECIMAL` or `NUMERIC` function argument