/**
* Replaces the operands of a call. The new operands' types must match the old operands' types.
*/
public static RexCall replaceOperands(RexCall call, RexNode[] operands) {
if (call.operands == operands) {
return call;
}
for (int i = 0; i < operands.length; i++) {
RelDataType oldType = call.operands[i].getType();
RelDataType newType = operands[i].getType();
if (!oldType.isNullable() && newType.isNullable()) {
throw Util.newInternal("invalid nullability");
}
assert (oldType.toString().equals(newType.toString()));
}
return new RexCall(call.getType(), call.getOperator(), operands);
}
public String getFieldTypeName(int fieldOrdinal) {
RelDataType type = getFieldNamedType(fieldOrdinal);
SqlTypeName typeName = type.getSqlTypeName();
if (typeName == null) {
return type.toString();
}
switch (typeName) {
case STRUCTURED:
case DISTINCT:
return type.getSqlIdentifier().toString();
case INTERVAL_DAY_TIME:
case INTERVAL_YEAR_MONTH:
return type.toString();
}
return typeName.name();
}
public static void checkCharsetAndCollateConsistentIfCharType(RelDataType type) {
// (every charset must have a default collation)
if (SqlTypeUtil.inCharFamily(type)) {
Charset strCharset = type.getCharset();
Charset colCharset = type.getCollation().getCharset();
assert null != strCharset;
assert null != colCharset;
if (!strCharset.equals(colCharset)) {
if (false) {
// todo: enable this checking when we have a charset to
// collation mapping
throw new Error(
type.toString()
+ " was found to have charset '"
+ strCharset.name()
+ "' and a mismatched collation charset '"
+ colCharset.name()
+ "'");
}
}
}
}
private Expression castToAssignableValueImpl() {
if (requiresSpecializedCast()) {
if (rhsType.isNullable() && (!SqlTypeUtil.isDecimal(rhsType))) {
rhsExp = getValue(rhsType, rhsExp);
}
addStatement(
new ExpressionStatement(
new MethodCall(
lhsExp,
"cast",
new ExpressionList(rhsExp, Literal.makeLiteral(lhsType.getPrecision())))));
} else {
// Set current_date for casting time to timestamp. If
// rhsType is null then we may have to be ready for anything.
// But it will be null even for current_timestamp, so the
// condition below seems a bit excessive.
if ((lhsType.getSqlTypeName() == SqlTypeName.TIMESTAMP)
&& ((rhsType == null) || (rhsType.getSqlTypeName() == SqlTypeName.TIME))) {
addStatement(
new ExpressionStatement(
new MethodCall(lhsExp, "setCurrentDate", new ExpressionList(getCurrentDate()))));
}
addStatement(
new ExpressionStatement(
new MethodCall(
lhsExp, AssignableValue.ASSIGNMENT_METHOD_NAME, new ExpressionList(rhsExp))));
}
// Trim precision of datetime values.
//
if (((lhsType.getSqlTypeName() == SqlTypeName.TIMESTAMP)
|| (lhsType.getSqlTypeName() == SqlTypeName.TIME))) {
if ((rhsType != null)
// FIXME: JavaType(java.sql.Time) and
// JavaType(java.sql.Timestamp) say they support precision
// but do not.
&& !rhsType.toString().startsWith("JavaType(")
&& rhsType.getSqlTypeName().allowsPrec()
&& (lhsType.getPrecision() < rhsType.getPrecision())) {
int lhsPrecision = lhsType.getPrecision();
if (lhsPrecision == -1) {
lhsPrecision = 0;
}
addStatement(
new ExpressionStatement(
new MethodCall(
lhsExp,
SqlDateTimeWithoutTZ.ADJUST_PRECISION_METHOD_NAME,
new ExpressionList(Literal.makeLiteral(lhsPrecision)))));
}
}
boolean mayNeedPadOrTruncate = false;
if (SqlTypeUtil.inCharOrBinaryFamilies(lhsType) && !SqlTypeUtil.isLob(lhsType)) {
mayNeedPadOrTruncate = true;
}
if (mayNeedPadOrTruncate) {
// check overflow if it is datetime.
// TODO: should check it at the run time.
// so, it should be in the
// cast(SqlDateTimeWithTZ, int precision);
if ((rhsType != null) && (rhsType.getSqlTypeName() != null)) {
SqlTypeName typeName = rhsType.getSqlTypeName();
int precision = 0;
switch (typeName) {
case DATE:
precision = 10;
break;
case TIME:
precision = 8;
break;
case TIMESTAMP:
precision = 19;
break;
}
if ((precision != 0) && (precision > lhsType.getPrecision())) {
addStatement(
new IfStatement(
new BinaryExpression(
Literal.makeLiteral(precision),
BinaryExpression.GREATER,
Literal.makeLiteral(lhsType.getPrecision())),
getThrowStmtList()));
}
}
if ((rhsType != null)
&& (rhsType.getFamily() == lhsType.getFamily())
&& !SqlTypeUtil.isLob(rhsType)) {
// we may be able to skip pad/truncate based on
// known facts about source and target precisions
if (SqlTypeUtil.isBoundedVariableWidth(lhsType)) {
if (lhsType.getPrecision() >= rhsType.getPrecision()) {
// target precision is greater than source
// precision, so truncation is impossible
// and we can skip adjustment
return lhsExp;
}
} else {
if ((lhsType.getPrecision() == rhsType.getPrecision())
&& !SqlTypeUtil.isBoundedVariableWidth(rhsType)) {
// source and target are both fixed-width, and
// precisions are the same, so there's no adjustment
// needed
return lhsExp;
}
}
}
// determine target precision
Expression precisionExp = Literal.makeLiteral(lhsType.getPrecision());
// need to pad only for fixed width
Expression needPadExp = Literal.makeLiteral(!SqlTypeUtil.isBoundedVariableWidth(lhsType));
// pad character is 0 for binary, space for character
Expression padByteExp;
if (!SqlTypeUtil.inCharFamily(lhsType)) {
padByteExp = new CastExpression(OJSystem.BYTE, Literal.makeLiteral(0));
} else {
padByteExp = new CastExpression(OJSystem.BYTE, Literal.makeLiteral(' '));
}
// generate the call to do the job
addStatement(
new ExpressionStatement(
new MethodCall(
lhsExp,
BytePointer.ENFORCE_PRECISION_METHOD_NAME,
new ExpressionList(precisionExp, needPadExp, padByteExp))));
}
return lhsExp;
}