/**
* Compare two values with the current comparison mode. The values may be of different type.
*
* @param a the first value
* @param b the second value
* @return 0 if both values are equal, -1 if the first value is smaller, and 1 otherwise
*/
public int compareTypeSave(Value a, Value b) {
if (a == b) {
return 0;
}
int dataType = Value.getHigherOrder(a.getType(), b.getType());
a = a.convertTo(dataType);
b = b.convertTo(dataType);
return a.compareTypeSave(b, compareMode);
}
private ValueResultSet getTable(
Session session, Expression[] argList, boolean onlyColumnList, boolean distinctRows) {
int len = columnList.length;
Expression[] header = new Expression[len];
Database db = session.getDatabase();
for (int i = 0; i < len; i++) {
Column c = columnList[i];
ExpressionColumn col = new ExpressionColumn(db, c);
header[i] = col;
}
LocalResult result = new LocalResult(session, header, len);
if (distinctRows) {
result.setDistinct();
}
if (!onlyColumnList) {
Value[][] list = new Value[len][];
int rows = 0;
for (int i = 0; i < len; i++) {
Value v = argList[i].getValue(session);
if (v == ValueNull.INSTANCE) {
list[i] = new Value[0];
} else {
ValueArray array = (ValueArray) v.convertTo(Value.ARRAY);
Value[] l = array.getList();
list[i] = l;
rows = Math.max(rows, l.length);
}
}
for (int row = 0; row < rows; row++) {
Value[] r = new Value[len];
for (int j = 0; j < len; j++) {
Value[] l = list[j];
Value v;
if (l.length <= row) {
v = ValueNull.INSTANCE;
} else {
Column c = columnList[j];
v = l[row];
v = c.convert(v);
v = v.convertPrecision(c.getPrecision(), false);
v = v.convertScale(true, c.getScale());
}
r[j] = v;
}
result.addRow(r);
}
}
result.done();
ValueResultSet vr = ValueResultSet.get(getSimpleResultSet(result, Integer.MAX_VALUE));
return vr;
}