src/main/java/org/vanilladb/bench/benchmarks/tpcc/TpccValueGenerator.java
public String randomAString(int minLength, int maxLength) {
		int length = number(minLength, maxLength);
		return randomAString(length);
	}
public String randomAString(int minLength, int maxLength) {
		int length = number(minLength, maxLength);
		return randomAString(length);
	}
Return a string of random alphanumeric characters of a random length
between [minLength, maxLength].