@Override
  public String vectorExpressionParameters() {
    return getColumnParamString(0, inputColumnNum[0]) + ", " + getColumnParamString(1, inputColumnNum[1]);
  }
Evaluate AND of two boolean columns and store result in the output boolean column.
The first input column field is reused from VectorExpression.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/ColAndCol.java