/**
* Return type t such that values from both t1 and t2 can be assigned to t without loss of
* precision. Returns INVALID_TYPE if there is no such type or if any of t1 and t2 is
* INVALID_TYPE.
*/
public static ColumnType getAssignmentCompatibleType(ColumnType t1, ColumnType t2) {
if (!t1.isValid() || !t2.isValid()) return INVALID;
if (t1.equals(t2)) return t1;
if (t1.isDecimal() || t2.isDecimal()) {
if (t1.isNull()) return t2;
if (t2.isNull()) return t1;
// Allow casts between decimal and numeric types by converting
// numeric types to the containing decimal type.
ColumnType t1Decimal = t1.getMinResolutionDecimal();
ColumnType t2Decimal = t2.getMinResolutionDecimal();
if (t1Decimal.isInvalid() || t2Decimal.isInvalid()) return ColumnType.INVALID;
Preconditions.checkState(t1Decimal.isDecimal());
Preconditions.checkState(t2Decimal.isDecimal());
if (t1Decimal.isSupertypeOf(t2Decimal)) return t1;
if (t2Decimal.isSupertypeOf(t1Decimal)) return t2;
return TypesUtil.getDecimalAssignmentCompatibleType(t1Decimal, t2Decimal);
}
PrimitiveType smallerType = (t1.type_.ordinal() < t2.type_.ordinal() ? t1.type_ : t2.type_);
PrimitiveType largerType = (t1.type_.ordinal() > t2.type_.ordinal() ? t1.type_ : t2.type_);
PrimitiveType result = compatibilityMatrix[smallerType.ordinal()][largerType.ordinal()];
Preconditions.checkNotNull(result);
return createType(result);
}
