public static Type getAggregatedType(Type add, Type existing) throws HsqlException {
if (existing == null || existing.type == Types.SQL_ALL_TYPES) {
return add;
}
if (add == null || add.type == Types.SQL_ALL_TYPES) {
return existing;
}
return existing.getAggregateType(add);
}
public static Type getAggregateType(Type add, Type existing) {
if (existing == null || existing.typeCode == Types.SQL_ALL_TYPES) {
return add;
}
if (add == null || add.typeCode == Types.SQL_ALL_TYPES) {
return existing;
}
return existing.getAggregateType(add);
}
public Type getAggregateType(Type other) throws HsqlException {
if (this == other) {
return this;
}
if (other.isCharacterType()) {
return other.getAggregateType(this);
}
switch (other.typeCode) {
case Types.SQL_ALL_TYPES:
return this;
case Types.SQL_REAL:
case Types.SQL_FLOAT:
case Types.SQL_DOUBLE:
case Types.SQL_NUMERIC:
case Types.SQL_DECIMAL:
case Types.TINYINT:
case Types.SQL_SMALLINT:
case Types.SQL_INTEGER:
case Types.SQL_BIGINT:
break;
default:
throw Error.error(ErrorCode.X_42562);
}
if (typeWidth == DOUBLE_WIDTH) {
return this;
}
if (((NumberType) other).typeWidth == DOUBLE_WIDTH) {
return other;
}
if (typeWidth <= BIGINT_WIDTH && ((NumberType) other).typeWidth <= BIGINT_WIDTH) {
return (typeWidth > ((NumberType) other).typeWidth) ? this : other;
}
int newScale = scale > other.scale ? scale : other.scale;
long newDigits =
precision - scale > other.precision - other.scale
? precision - scale
: other.precision - other.scale;
return getNumberType(Types.SQL_DECIMAL, newDigits + newScale, newScale);
}
public void resolveTypes(Session session, Expression parent) {
switch (opType) {
case OpTypes.DEFAULT:
if (parent != null && parent.opType != OpTypes.ROW) {
throw Error.error(ErrorCode.X_42544);
}
break;
case OpTypes.COALESCE:
{
Type type = null;
for (int i = 0; i < nodes.length; i++) {
type = Type.getAggregateType(nodes[i].dataType, type);
}
dataType = type;
break;
}
}
}
