@Override
Value getMergedValue(Database database, int dataType, boolean distinct) {
if (distinct) {
count = 0;
groupDistinct(database, dataType);
}
Value v = null;
switch (aggregateType) {
case Aggregate.SUM:
case Aggregate.MIN:
case Aggregate.MAX:
case Aggregate.BOOL_AND:
case Aggregate.BOOL_OR:
case Aggregate.BIT_AND:
case Aggregate.BIT_OR:
v = value;
break;
case Aggregate.AVG:
case Aggregate.STDDEV_POP:
case Aggregate.STDDEV_SAMP:
case Aggregate.VAR_POP:
case Aggregate.VAR_SAMP:
default:
DbException.throwInternalError("type=" + aggregateType);
}
return v == null ? ValueNull.INSTANCE : v.convertTo(dataType);
}
@Override
Value getValue(Database database, int dataType, boolean distinct) {
if (distinct) {
count = 0;
groupDistinct(database, dataType);
}
Value v = null;
switch (aggregateType) {
case Aggregate.SUM:
case Aggregate.MIN:
case Aggregate.MAX:
case Aggregate.BIT_OR:
case Aggregate.BIT_AND:
case Aggregate.BOOL_OR:
case Aggregate.BOOL_AND:
v = value;
break;
case Aggregate.AVG:
if (value != null) {
v = Aggregate.divide(value, count);
}
break;
case Aggregate.STDDEV_POP:
{
if (count < 1) {
return ValueNull.INSTANCE;
}
v = ValueDouble.get(Math.sqrt(m2 / count));
break;
}
case Aggregate.STDDEV_SAMP:
{
if (count < 2) {
return ValueNull.INSTANCE;
}
v = ValueDouble.get(Math.sqrt(m2 / (count - 1)));
break;
}
case Aggregate.VAR_POP:
{
if (count < 1) {
return ValueNull.INSTANCE;
}
v = ValueDouble.get(m2 / count);
break;
}
case Aggregate.VAR_SAMP:
{
if (count < 2) {
return ValueNull.INSTANCE;
}
v = ValueDouble.get(m2 / (count - 1));
break;
}
default:
DbException.throwInternalError("type=" + aggregateType);
}
return v == null ? ValueNull.INSTANCE : v.convertTo(dataType);
}
@Override
void add(Database database, int dataType, boolean distinct, Value v) {
if (v == ValueNull.INSTANCE) {
return;
}
count++;
if (distinct) {
if (distinctValues == null) {
distinctValues = ValueHashMap.newInstance();
}
distinctValues.put(v, this);
return;
}
switch (aggregateType) {
case Aggregate.SUM:
if (value == null) {
value = v.convertTo(dataType);
} else {
v = v.convertTo(value.getType());
value = value.add(v);
}
break;
case Aggregate.AVG:
if (value == null) {
value = v.convertTo(DataType.getAddProofType(dataType));
} else {
v = v.convertTo(value.getType());
value = value.add(v);
}
break;
case Aggregate.MIN:
if (value == null || database.compare(v, value) < 0) {
value = v;
}
break;
case Aggregate.MAX:
if (value == null || database.compare(v, value) > 0) {
value = v;
}
break;
case Aggregate.STDDEV_POP:
case Aggregate.STDDEV_SAMP:
case Aggregate.VAR_POP:
case Aggregate.VAR_SAMP:
{
// Using Welford's method, see also
// http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
// http://www.johndcook.com/standard_deviation.html
double x = v.getDouble();
if (count == 1) {
mean = x;
m2 = 0;
} else {
double delta = x - mean;
mean += delta / count;
m2 += delta * (x - mean);
}
break;
}
case Aggregate.BOOL_AND:
v = v.convertTo(Value.BOOLEAN);
if (value == null) {
value = v;
} else {
value =
ValueBoolean.get(value.getBoolean().booleanValue() && v.getBoolean().booleanValue());
}
break;
case Aggregate.BOOL_OR:
v = v.convertTo(Value.BOOLEAN);
if (value == null) {
value = v;
} else {
value =
ValueBoolean.get(value.getBoolean().booleanValue() || v.getBoolean().booleanValue());
}
break;
case Aggregate.BIT_AND:
if (value == null) {
value = v.convertTo(dataType);
} else {
value = ValueLong.get(value.getLong() & v.getLong()).convertTo(dataType);
}
break;
case Aggregate.BIT_OR:
if (value == null) {
value = v.convertTo(dataType);
} else {
value = ValueLong.get(value.getLong() | v.getLong()).convertTo(dataType);
}
break;
default:
DbException.throwInternalError("type=" + aggregateType);
}
}
@Override
void merge(Database database, int dataType, boolean distinct, Value v) {
if (v == ValueNull.INSTANCE) {
return;
}
count++;
if (distinct) {
if (distinctValues == null) {
distinctValues = ValueHashMap.newInstance();
}
distinctValues.put(v, this);
return;
}
switch (aggregateType) {
case Aggregate.SUM:
if (value == null) {
value = v.convertTo(dataType);
} else {
v = v.convertTo(value.getType());
value = value.add(v);
}
break;
case Aggregate.MIN:
if (value == null || database.compare(v, value) < 0) {
value = v;
}
break;
case Aggregate.MAX:
if (value == null || database.compare(v, value) > 0) {
value = v;
}
break;
case Aggregate.BOOL_AND:
v = v.convertTo(Value.BOOLEAN);
if (value == null) {
value = v;
} else {
value =
ValueBoolean.get(value.getBoolean().booleanValue() && v.getBoolean().booleanValue());
}
break;
case Aggregate.BOOL_OR:
v = v.convertTo(Value.BOOLEAN);
if (value == null) {
value = v;
} else {
value =
ValueBoolean.get(value.getBoolean().booleanValue() || v.getBoolean().booleanValue());
}
break;
case Aggregate.BIT_AND:
if (value == null) {
value = v.convertTo(dataType);
} else {
value = ValueLong.get(value.getLong() & v.getLong()).convertTo(dataType);
}
break;
case Aggregate.BIT_OR:
if (value == null) {
value = v.convertTo(dataType);
} else {
value = ValueLong.get(value.getLong() | v.getLong()).convertTo(dataType);
}
break;
// 这5个在分布式环境下会进行重写，所以合并时是不会出现的
case Aggregate.AVG:
case Aggregate.STDDEV_POP:
case Aggregate.STDDEV_SAMP:
case Aggregate.VAR_POP:
case Aggregate.VAR_SAMP:
default:
DbException.throwInternalError("type=" + aggregateType);
}
}
/**
* Calculate the number of bytes required to encode the given value.
*
* @param v the value
* @param handler the data handler for lobs
* @return the number of bytes required to store this value
*/
public static int getValueLen(Value v, DataHandler handler) {
if (v == ValueNull.INSTANCE) {
return 1;
}
switch (v.getType()) {
case Value.BOOLEAN:
return 1;
case Value.BYTE:
return 2;
case Value.SHORT:
return 3;
case Value.INT:
{
int x = v.getInt();
if (x < 0) {
return 1 + getVarIntLen(-x);
} else if (x < 16) {
return 1;
} else {
return 1 + getVarIntLen(x);
}
}
case Value.LONG:
{
long x = v.getLong();
if (x < 0) {
return 1 + getVarLongLen(-x);
} else if (x < 8) {
return 1;
} else {
return 1 + getVarLongLen(x);
}
}
case Value.DOUBLE:
{
double x = v.getDouble();
if (x == 1.0d) {
return 1;
}
long d = Double.doubleToLongBits(x);
if (d == ValueDouble.ZERO_BITS) {
return 1;
}
return 1 + getVarLongLen(Long.reverse(d));
}
case Value.FLOAT:
{
float x = v.getFloat();
if (x == 1.0f) {
return 1;
}
int f = Float.floatToIntBits(x);
if (f == ValueFloat.ZERO_BITS) {
return 1;
}
return 1 + getVarIntLen(Integer.reverse(f));
}
case Value.STRING:
{
String s = v.getString();
int len = s.length();
if (len < 32) {
return 1 + getStringWithoutLengthLen(s, len);
}
return 1 + getStringLen(s);
}
case Value.STRING_IGNORECASE:
case Value.STRING_FIXED:
return 1 + getStringLen(v.getString());
case Value.DECIMAL:
{
BigDecimal x = v.getBigDecimal();
if (BigDecimal.ZERO.equals(x)) {
return 1;
} else if (BigDecimal.ONE.equals(x)) {
return 1;
}
int scale = x.scale();
BigInteger b = x.unscaledValue();
int bits = b.bitLength();
if (bits <= 63) {
if (scale == 0) {
return 1 + getVarLongLen(b.longValue());
}
return 1 + getVarIntLen(scale) + getVarLongLen(b.longValue());
}
byte[] bytes = b.toByteArray();
return 1 + getVarIntLen(scale) + getVarIntLen(bytes.length) + bytes.length;
}
case Value.TIME:
if (SysProperties.STORE_LOCAL_TIME) {
long nanos = ((ValueTime) v).getNanos();
long millis = nanos / 1000000;
nanos -= millis * 1000000;
return 1 + getVarLongLen(millis) + getVarLongLen(nanos);
}
return 1 + getVarLongLen(DateTimeUtils.getTimeLocalWithoutDst(v.getTime()));
case Value.DATE:
{
if (SysProperties.STORE_LOCAL_TIME) {
long dateValue = ((ValueDate) v).getDateValue();
return 1 + getVarLongLen(dateValue);
}
long x = DateTimeUtils.getTimeLocalWithoutDst(v.getDate());
return 1 + getVarLongLen(x / MILLIS_PER_MINUTE);
}
case Value.TIMESTAMP:
{
if (SysProperties.STORE_LOCAL_TIME) {
ValueTimestamp ts = (ValueTimestamp) v;
long dateValue = ts.getDateValue();
long nanos = ts.getNanos();
long millis = nanos / 1000000;
nanos -= millis * 1000000;
return 1 + getVarLongLen(dateValue) + getVarLongLen(millis) + getVarLongLen(nanos);
}
Timestamp ts = v.getTimestamp();
return 1
+ getVarLongLen(DateTimeUtils.getTimeLocalWithoutDst(ts))
+ getVarIntLen(ts.getNanos());
}
case Value.JAVA_OBJECT:
{
byte[] b = v.getBytesNoCopy();
return 1 + getVarIntLen(b.length) + b.length;
}
case Value.BYTES:
{
byte[] b = v.getBytesNoCopy();
int len = b.length;
if (len < 32) {
return 1 + b.length;
}
return 1 + getVarIntLen(b.length) + b.length;
}
case Value.UUID:
return 1 + LENGTH_LONG + LENGTH_LONG;
case Value.BLOB:
case Value.CLOB:
{
int len = 1;
ValueLob lob = (ValueLob) v;
byte[] small = lob.getSmall();
if (small == null) {
len += getVarIntLen(-1);
len += getVarIntLen(lob.getTableId());
len += getVarLongLen(lob.getLobId());
len += getVarLongLen(lob.getPrecision());
} else {
len += getVarIntLen(small.length);
len += small.length;
}
return len;
}
case Value.ARRAY:
{
Value[] list = ((ValueArray) v).getList();
int len = 1 + getVarIntLen(list.length);
for (Value x : list) {
len += getValueLen(x, handler);
}
return len;
}
case Value.RESULT_SET:
{
int len = 1;
try {
ResultSet rs = ((ValueResultSet) v).getResultSet();
rs.beforeFirst();
ResultSetMetaData meta = rs.getMetaData();
int columnCount = meta.getColumnCount();
len += getVarIntLen(columnCount);
for (int i = 0; i < columnCount; i++) {
len += getStringLen(meta.getColumnName(i + 1));
len += getVarIntLen(meta.getColumnType(i + 1));
len += getVarIntLen(meta.getPrecision(i + 1));
len += getVarIntLen(meta.getScale(i + 1));
}
while (rs.next()) {
len++;
for (int i = 0; i < columnCount; i++) {
int t = DataType.convertSQLTypeToValueType(meta.getColumnType(i + 1));
Value val = DataType.readValue(null, rs, i + 1, t);
len += getValueLen(val, handler);
}
}
len++;
rs.beforeFirst();
} catch (SQLException e) {
throw DbException.convert(e);
}
return len;
}
default:
throw DbException.throwInternalError("type=" + v.getType());
}
}
/**
* Append a value.
*
* @param v the value
*/
public void writeValue(Value v) {
int start = pos;
if (v == ValueNull.INSTANCE) {
data[pos++] = 0;
return;
}
int type = v.getType();
switch (type) {
case Value.BOOLEAN:
writeByte((byte) (v.getBoolean().booleanValue() ? BOOLEAN_TRUE : BOOLEAN_FALSE));
break;
case Value.BYTE:
writeByte((byte) type);
writeByte(v.getByte());
break;
case Value.SHORT:
writeByte((byte) type);
writeShortInt(v.getShort());
break;
case Value.INT:
{
int x = v.getInt();
if (x < 0) {
writeByte((byte) INT_NEG);
writeVarInt(-x);
} else if (x < 16) {
writeByte((byte) (INT_0_15 + x));
} else {
writeByte((byte) type);
writeVarInt(x);
}
break;
}
case Value.LONG:
{
long x = v.getLong();
if (x < 0) {
writeByte((byte) LONG_NEG);
writeVarLong(-x);
} else if (x < 8) {
writeByte((byte) (LONG_0_7 + x));
} else {
writeByte((byte) type);
writeVarLong(x);
}
break;
}
case Value.DECIMAL:
{
BigDecimal x = v.getBigDecimal();
if (BigDecimal.ZERO.equals(x)) {
writeByte((byte) DECIMAL_0_1);
} else if (BigDecimal.ONE.equals(x)) {
writeByte((byte) (DECIMAL_0_1 + 1));
} else {
int scale = x.scale();
BigInteger b = x.unscaledValue();
int bits = b.bitLength();
if (bits <= 63) {
if (scale == 0) {
writeByte((byte) DECIMAL_SMALL_0);
writeVarLong(b.longValue());
} else {
writeByte((byte) DECIMAL_SMALL);
writeVarInt(scale);
writeVarLong(b.longValue());
}
} else {
writeByte((byte) type);
writeVarInt(scale);
byte[] bytes = b.toByteArray();
writeVarInt(bytes.length);
write(bytes, 0, bytes.length);
}
}
break;
}
case Value.TIME:
if (SysProperties.STORE_LOCAL_TIME) {
writeByte((byte) LOCAL_TIME);
ValueTime t = (ValueTime) v;
long nanos = t.getNanos();
long millis = nanos / 1000000;
nanos -= millis * 1000000;
writeVarLong(millis);
writeVarLong(nanos);
} else {
writeByte((byte) type);
writeVarLong(DateTimeUtils.getTimeLocalWithoutDst(v.getTime()));
}
break;
case Value.DATE:
{
if (SysProperties.STORE_LOCAL_TIME) {
writeByte((byte) LOCAL_DATE);
long x = ((ValueDate) v).getDateValue();
writeVarLong(x);
} else {
writeByte((byte) type);
long x = DateTimeUtils.getTimeLocalWithoutDst(v.getDate());
writeVarLong(x / MILLIS_PER_MINUTE);
}
break;
}
case Value.TIMESTAMP:
{
if (SysProperties.STORE_LOCAL_TIME) {
writeByte((byte) LOCAL_TIMESTAMP);
ValueTimestamp ts = (ValueTimestamp) v;
long dateValue = ts.getDateValue();
writeVarLong(dateValue);
long nanos = ts.getNanos();
long millis = nanos / 1000000;
nanos -= millis * 1000000;
writeVarLong(millis);
writeVarLong(nanos);
} else {
Timestamp ts = v.getTimestamp();
writeByte((byte) type);
writeVarLong(DateTimeUtils.getTimeLocalWithoutDst(ts));
writeVarInt(ts.getNanos());
}
break;
}
case Value.JAVA_OBJECT:
{
writeByte((byte) type);
byte[] b = v.getBytesNoCopy();
writeVarInt(b.length);
write(b, 0, b.length);
break;
}
case Value.BYTES:
{
byte[] b = v.getBytesNoCopy();
int len = b.length;
if (len < 32) {
writeByte((byte) (BYTES_0_31 + len));
write(b, 0, b.length);
} else {
writeByte((byte) type);
writeVarInt(b.length);
write(b, 0, b.length);
}
break;
}
case Value.UUID:
{
writeByte((byte) type);
ValueUuid uuid = (ValueUuid) v;
writeLong(uuid.getHigh());
writeLong(uuid.getLow());
break;
}
case Value.STRING:
{
String s = v.getString();
int len = s.length();
if (len < 32) {
writeByte((byte) (STRING_0_31 + len));
writeStringWithoutLength(s, len);
} else {
writeByte((byte) type);
writeString(s);
}
break;
}
case Value.STRING_IGNORECASE:
case Value.STRING_FIXED:
writeByte((byte) type);
writeString(v.getString());
break;
case Value.DOUBLE:
{
double x = v.getDouble();
if (x == 1.0d) {
writeByte((byte) (DOUBLE_0_1 + 1));
} else {
long d = Double.doubleToLongBits(x);
if (d == ValueDouble.ZERO_BITS) {
writeByte((byte) DOUBLE_0_1);
} else {
writeByte((byte) type);
writeVarLong(Long.reverse(d));
}
}
break;
}
case Value.FLOAT:
{
float x = v.getFloat();
if (x == 1.0f) {
writeByte((byte) (FLOAT_0_1 + 1));
} else {
int f = Float.floatToIntBits(x);
if (f == ValueFloat.ZERO_BITS) {
writeByte((byte) FLOAT_0_1);
} else {
writeByte((byte) type);
writeVarInt(Integer.reverse(f));
}
}
break;
}
case Value.BLOB:
case Value.CLOB:
{
writeByte((byte) type);
ValueLob lob = (ValueLob) v;
byte[] small = lob.getSmall();
if (small == null) {
writeVarInt(-1);
writeVarInt(lob.getTableId());
writeVarLong(lob.getLobId());
writeVarLong(lob.getPrecision());
} else {
writeVarInt(small.length);
write(small, 0, small.length);
}
break;
}
case Value.ARRAY:
{
writeByte((byte) type);
Value[] list = ((ValueArray) v).getList();
writeVarInt(list.length);
for (Value x : list) {
writeValue(x);
}
break;
}
case Value.RESULT_SET:
{
writeByte((byte) type);
try {
ResultSet rs = ((ValueResultSet) v).getResultSet();
rs.beforeFirst();
ResultSetMetaData meta = rs.getMetaData();
int columnCount = meta.getColumnCount();
writeVarInt(columnCount);
for (int i = 0; i < columnCount; i++) {
writeString(meta.getColumnName(i + 1));
writeVarInt(meta.getColumnType(i + 1));
writeVarInt(meta.getPrecision(i + 1));
writeVarInt(meta.getScale(i + 1));
}
while (rs.next()) {
writeByte((byte) 1);
for (int i = 0; i < columnCount; i++) {
int t = DataType.convertSQLTypeToValueType(meta.getColumnType(i + 1));
Value val = DataType.readValue(null, rs, i + 1, t);
writeValue(val);
}
}
writeByte((byte) 0);
rs.beforeFirst();
} catch (SQLException e) {
throw DbException.convert(e);
}
break;
}
default:
DbException.throwInternalError("type=" + v.getType());
}
if (SysProperties.CHECK2) {
if (pos - start != getValueLen(v, handler)) {
throw DbException.throwInternalError(
"value size error: got " + (pos - start) + " expected " + getValueLen(v, handler));
}
}
}