@Override
    public Object parse(SourceData sourceData, int rowIndex, Context context) {
        Object numObj = numParser.parse(sourceData, rowIndex, context);
        if (numObj == null) {
            return null;
        }
        return OperatorTools.parseBigDecimal(numObj).scale();
    }
ScaleFunction  ->  scale(numeric)
description:
- Return NULL if 'numeric' is NULL
- Return scale of the argument (the number of decimal digits in the fractional part)
inlong-sdk/transform-sdk/src/main/java/org/apache/inlong/sdk/transform/process/function/arithmetic/ScaleFunction.java