@Override
public Statistics visitUnknown(LogicalExpression e, Void value) throws RuntimeException {
if (e instanceof TypedFieldExpr) {
TypedFieldExpr fieldExpr = (TypedFieldExpr) e;
final ColumnStatistics columnStatistics = columnStatMap.get(fieldExpr.getPath());
if (columnStatistics != null) {
return columnStatistics.getStatistics();
} else {
// field does not exist.
Preconditions.checkArgument(fieldExpr.getMajorType().equals(Types.OPTIONAL_INT));
IntStatistics intStatistics = new IntStatistics();
intStatistics.setNumNulls(rowCount); // all values are nulls
return intStatistics;
}
}
return null;
}
private IntStatistics getStatistics(int min, int max) {
final IntStatistics intStatistics = new IntStatistics();
intStatistics.setMinMax(min, max);
return intStatistics;
}