/** Uses multiple EQUAL expressions */
private void getFirstRowMulti() {
boolean convertible = true;
Object[] currentJoinData = new Object[rangeVar.rangeIndex.getVisibleColumns()];
for (int i = 0; i < rangeVar.multiColumnCount; i++) {
Type valueType = rangeVar.findFirstExpressions[i].getRightNode().getDataType();
Type targetType = rangeVar.findFirstExpressions[i].getLeftNode().getDataType();
Object value = rangeVar.findFirstExpressions[i].getRightNode().getValue(session);
if (targetType.compareToTypeRange(value) != 0) {
convertible = false;
break;
}
currentJoinData[i] = targetType.convertToType(session, value, valueType);
}
it =
convertible
? rangeVar.rangeIndex.findFirstRow(
session, store, currentJoinData, rangeVar.multiColumnCount)
: rangeVar.rangeIndex.emptyIterator();
}
private void getFirstRow() {
Object value = rangeVar.indexCondition.getRightNode().getValue(session);
Type valueType = rangeVar.indexCondition.getRightNode().getDataType();
Type targetType = rangeVar.indexCondition.getLeftNode().getDataType();
int exprType = rangeVar.indexCondition.getType();
int range = 0;
if (targetType != valueType) {
range = targetType.compareToTypeRange(value);
}
if (range == 0) {
value = targetType.convertToType(session, value, valueType);
it = rangeVar.rangeIndex.findFirstRow(session, store, value, exprType);
} else if (range < 0) {
switch (exprType) {
case OpTypes.GREATER_EQUAL:
case OpTypes.GREATER:
it = rangeVar.rangeIndex.findFirstRowNotNull(session, store);
break;
default:
it = rangeVar.rangeIndex.emptyIterator();
}
} else {
switch (exprType) {
case OpTypes.SMALLER_EQUAL:
case OpTypes.SMALLER:
it = rangeVar.rangeIndex.findFirstRowNotNull(session, store);
break;
default:
it = rangeVar.rangeIndex.emptyIterator();
}
}
return;
}