Whitespace removal: trim, rtrim, ltrim

Syntax

{ trim | ltrim | rtrim }¹ ( op )

Input parameters

op	the operand

Semantics for scalar operations

Removes trailing or/and leading whitespace from a string. For example, trim("Hello ") gives "Hello".

Input parameters type

op1

dataset { measure<string> _+ }
| component<string>
| string

Result type

result

dataset { measure<string> _+ }
| component<string>
| string

Additional Constraints

None.

Behavior

The operator has the behaviour of the “Operators applicable on one Scalar Value or Data Set or Data Set Component” (see the section “Typical behaviours of the ML Operators”).

Examples

Given the operand dataset DS_1 (note that the input data have a whitesapce at the end of the string, which may not be visualised):

Input DS_1 (see structure)

Id_1	Id_2	Me_1
1	A	hello
2	B	hi

Example 1

DS_r := rtrim(DS_1);

results in (see structure):

DS_r
Id_1	Id_2	Me_1
1	A	hello
2	B	hi

Example 2

DS_r := DS_1[ calc Me_2:= rtrim(Me_1)];

results in (see structure):

DS_r
Id_1	Id_2	Me_1	Me_2
1	A	hello	hello
2	B	hi	hi