Exception when there is function expression in pos or len of substring

[jackylee-ch]

Describe the bug

Caused by: java.lang.ClassCastException: com.intel.oap.expression.ColumnarSubtract cannot be cast to com.intel.oap.expression.ColumnarLiteral
	at com.intel.oap.expression.ColumnarSubString.doColumnarCodeGen(ColumnarTernaryOperator.scala:60)
	at com.intel.oap.expression.ColumnarAlias.doColumnarCodeGen(ColumnarNamedExpressions.scala:39)
	at com.intel.oap.expression.ColumnarConditionProjector$.$anonfun$init$3(ColumnarConditionProjector.scala:371)

To Reproduce

select substr(col, 2, length(col) - 2) from table

Expected behavior
None Exception.

Additional context
None

[PHILO-HE]

Fixed.