@Override
public void createIndexConditions(Session session, TableFilter filter) {
TableFilter tf = getTableFilter();
if (filter == tf && column.getType() == Value.BOOLEAN) {
IndexCondition cond =
IndexCondition.get(Comparison.EQUAL, this, ValueExpression.get(ValueBoolean.get(true)));
filter.addIndexCondition(cond);
}
}
public Expression optimize(Session session) {
boolean allConst = isDeterministic();
for (int i = 0, len = args.length; i < len; i++) {
Expression e = args[i].optimize(session);
args[i] = e;
allConst &= e.isConstant();
}
if (allConst) {
return ValueExpression.get(getValue(session));
}
return this;
}
@Override
public Expression optimize(Session session) {
boolean allConst = true;
for (int i = 0; i < list.length; i++) {
Expression e = list[i].optimize(session);
if (!e.isConstant()) {
allConst = false;
}
list[i] = e;
}
if (allConst) {
return ValueExpression.get(getValue(session));
}
return this;
}
@Override
public Expression optimize(Session session) {
left = left.optimize(session);
boolean constant = left.isConstant();
if (constant && left == ValueExpression.getNull()) {
return left;
}
boolean allValuesConstant = true;
boolean allValuesNull = true;
int size = valueList.size();
for (int i = 0; i < size; i++) {
Expression e = valueList.get(i);
e = e.optimize(session);
if (e.isConstant() && e.getValue(session) != ValueNull.INSTANCE) {
allValuesNull = false;
}
if (allValuesConstant && !e.isConstant()) {
allValuesConstant = false;
}
if (left instanceof ExpressionColumn && e instanceof Parameter) {
((Parameter) e).setColumn(((ExpressionColumn) left).getColumn());
}
valueList.set(i, e);
}
if (constant && allValuesConstant) {
return ValueExpression.get(getValue(session));
}
if (size == 1) {
Expression right = valueList.get(0);
Expression expr = new Comparison(session, Comparison.EQUAL, left, right);
expr = expr.optimize(session);
return expr;
}
if (allValuesConstant && !allValuesNull) {
int leftType = left.getType();
if (leftType == Value.UNKNOWN) {
return this;
}
Expression expr = new ConditionInConstantSet(session, left, valueList);
expr = expr.optimize(session);
return expr;
}
return this;
}
@Override
public Expression getNotIfPossible(Session session) {
return new Comparison(
session, Comparison.EQUAL, this, ValueExpression.get(ValueBoolean.get(false)));
}
