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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayListIdentity;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.map.ValuePool;
import org.hsqldb.types.DTIType;
import org.hsqldb.types.IntervalType;
import org.hsqldb.types.NumberType;
import org.hsqldb.types.RowType;
import org.hsqldb.types.Type;
import org.hsqldb.types.Types;
/**
* Implementation of aggregate operations
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.5.0
* @since 1.9.0
*/
public class ExpressionAggregate extends Expression {
ExpressionAggregate(int type, boolean distinct, Expression e) {
super(type);
nodes = new Expression[BINARY];
isDistinctAggregate = distinct;
nodes[LEFT] = e;
nodes[RIGHT] = Expression.EXPR_TRUE;
}
public boolean isSelfAggregate() {
return true;
}
public String getSQL() {
StringBuilder sb = new StringBuilder(64);
String left = getContextSQL(nodes.length > 0 ? nodes[LEFT]
: null);
switch (opType) {
case OpTypes.COUNT :
sb.append(' ').append(Tokens.T_COUNT).append('(');
sb.append(left).append(')');
break;
case OpTypes.SUM :
sb.append(' ').append(Tokens.T_SUM).append('(');
sb.append(left).append(')');
break;
case OpTypes.MIN :
sb.append(' ').append(Tokens.T_MIN).append('(');
sb.append(left).append(')');
break;
case OpTypes.MAX :
sb.append(' ').append(Tokens.T_MAX).append('(');
sb.append(left).append(')');
break;
case OpTypes.AVG :
sb.append(' ').append(Tokens.T_AVG).append('(');
sb.append(left).append(')');
break;
case OpTypes.EVERY :
sb.append(' ').append(Tokens.T_EVERY).append('(');
sb.append(left).append(')');
break;
case OpTypes.SOME :
sb.append(' ').append(Tokens.T_SOME).append('(');
sb.append(left).append(')');
break;
case OpTypes.STDDEV_POP :
sb.append(' ').append(Tokens.T_STDDEV_POP).append('(');
sb.append(left).append(')');
break;
case OpTypes.STDDEV_SAMP :
sb.append(' ').append(Tokens.T_STDDEV_SAMP).append('(');
sb.append(left).append(')');
break;
case OpTypes.VAR_POP :
sb.append(' ').append(Tokens.T_VAR_POP).append('(');
sb.append(left).append(')');
break;
case OpTypes.VAR_SAMP :
sb.append(' ').append(Tokens.T_VAR_SAMP).append('(');
sb.append(left).append(')');
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500,
"ExpressionAggregate");
}
return sb.toString();
}
protected String describe(Session session, int blanks) {
StringBuilder sb = new StringBuilder(64);
sb.append('\n');
for (int i = 0; i < blanks; i++) {
sb.append(' ');
}
switch (opType) {
case OpTypes.COUNT :
sb.append(Tokens.T_COUNT).append(' ');
break;
case OpTypes.SUM :
sb.append(Tokens.T_SUM).append(' ');
break;
case OpTypes.MIN :
sb.append(Tokens.T_MIN).append(' ');
break;
case OpTypes.MAX :
sb.append(Tokens.T_MAX).append(' ');
break;
case OpTypes.AVG :
sb.append(Tokens.T_AVG).append(' ');
break;
case OpTypes.EVERY :
sb.append(Tokens.T_EVERY).append(' ');
break;
case OpTypes.SOME :
sb.append(Tokens.T_SOME).append(' ');
break;
case OpTypes.STDDEV_POP :
sb.append(Tokens.T_STDDEV_POP).append(' ');
break;
case OpTypes.STDDEV_SAMP :
sb.append(Tokens.T_STDDEV_SAMP).append(' ');
break;
case OpTypes.VAR_POP :
sb.append(Tokens.T_VAR_POP).append(' ');
break;
case OpTypes.VAR_SAMP :
sb.append(Tokens.T_VAR_SAMP).append(' ');
break;
default :
}
if (getLeftNode() != null) {
sb.append(" arg=[");
sb.append(nodes[LEFT].describe(session, blanks + 1));
sb.append(']');
}
return sb.toString();
}
public HsqlList resolveColumnReferences(Session session,
RangeGroup rangeGroup, int rangeCount, RangeGroup[] rangeGroups,
HsqlList unresolvedSet, boolean acceptsSequences) {
HsqlList conditionSet = nodes[RIGHT].resolveColumnReferences(session,
rangeGroup, rangeCount, rangeGroups, null, false);
if (conditionSet != null) {
ExpressionColumn.checkColumnsResolved(conditionSet);
}
if (unresolvedSet == null) {
unresolvedSet = new ArrayListIdentity();
}
unresolvedSet.add(this);
if (rangeGroup.getRangeVariables().length > 0) {
this.rangeGroups = rangeGroups;
this.rangeGroup = rangeGroup;
}
return unresolvedSet;
}
public void resolveTypes(Session session, Expression parent) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
nodes[i].resolveTypes(session, this);
}
}
if (nodes[LEFT].getDegree() > 1) {
nodes[LEFT].dataType = new RowType(nodes[LEFT].nodeDataTypes);
}
if (nodes[LEFT].isUnresolvedParam()) {
throw Error.error(ErrorCode.X_42567);
}
if (isDistinctAggregate) {
if (nodes[LEFT].dataType.isLobType()) {
throw Error.error(ErrorCode.X_42534);
}
}
dataType = getType(session, opType, nodes[LEFT].dataType);
}
/**
* During parsing and before an instance of SetFunction is created,
* getType is called with type parameter set to correct type when main
* SELECT statements contain aggregates.
*
*/
static Type getType(Session session, int setType, Type dataType) {
if (setType == OpTypes.COUNT) {
return Type.SQL_BIGINT;
}
int typeCode = dataType.typeCode;
if (dataType.isIntervalYearMonthType()) {
typeCode = Types.SQL_INTERVAL_MONTH;
} else if (dataType.isIntervalDaySecondType()) {
typeCode = Types.SQL_INTERVAL_SECOND;
}
switch (setType) {
case OpTypes.AVG :
case OpTypes.MEDIAN : {
switch (typeCode) {
case Types.TINYINT :
case Types.SQL_SMALLINT :
case Types.SQL_INTEGER :
case Types.SQL_BIGINT :
case Types.SQL_NUMERIC :
case Types.SQL_DECIMAL :
int scale = session.database.sqlAvgScale;
if (scale <= dataType.scale) {
return dataType;
}
int digits =
((NumberType) dataType).getDecimalPrecision();
return NumberType.getNumberType(Types.SQL_DECIMAL,
digits + scale, scale);
case Types.SQL_REAL :
case Types.SQL_FLOAT :
case Types.SQL_DOUBLE :
case Types.SQL_INTERVAL_MONTH :
case Types.SQL_INTERVAL_SECOND :
case Types.SQL_DATE :
case Types.SQL_TIMESTAMP :
case Types.SQL_TIMESTAMP_WITH_TIME_ZONE :
return dataType;
default :
throw Error.error(ErrorCode.X_42563);
}
}
case OpTypes.SUM : {
switch (typeCode) {
case Types.TINYINT :
case Types.SQL_SMALLINT :
case Types.SQL_INTEGER :
return Type.SQL_BIGINT;
case Types.SQL_BIGINT :
return Type.SQL_DECIMAL_BIGINT_SQR;
case Types.SQL_REAL :
case Types.SQL_FLOAT :
case Types.SQL_DOUBLE :
return Type.SQL_DOUBLE;
case Types.SQL_NUMERIC :
case Types.SQL_DECIMAL :
return Type.getType(dataType.typeCode, null, null,
dataType.precision * 2,
dataType.scale);
case Types.SQL_INTERVAL_MONTH :
case Types.SQL_INTERVAL_SECOND :
return IntervalType.newIntervalType(
dataType.typeCode, DTIType.maxIntervalPrecision,
dataType.scale);
default :
throw Error.error(ErrorCode.X_42563);
}
}
case OpTypes.MIN :
case OpTypes.MAX :
if (dataType.isArrayType() || dataType.isLobType()) {
throw Error.error(ErrorCode.X_42563);
}
return dataType;
case OpTypes.EVERY :
case OpTypes.SOME :
if (dataType.isBooleanType()) {
return Type.SQL_BOOLEAN;
}
break;
case OpTypes.STDDEV_POP :
case OpTypes.STDDEV_SAMP :
case OpTypes.VAR_POP :
case OpTypes.VAR_SAMP :
if (dataType.isNumberType()) {
return Type.SQL_DOUBLE;
}
break;
case OpTypes.USER_AGGREGATE :
return dataType;
default :
throw Error.runtimeError(ErrorCode.U_S0500,
"ExpressionAggregate");
}
throw Error.error(ErrorCode.X_42563);
}
boolean equals(Expression other) {
if (other instanceof ExpressionAggregate) {
ExpressionAggregate o = (ExpressionAggregate) other;
boolean result = super.equals(other)
&& isDistinctAggregate == o.isDistinctAggregate;
return result;
}
return false;
}
public SetFunction updateAggregatingValue(Session session,
SetFunction currValue) {
if (!nodes[RIGHT].testCondition(session)) {
return currValue;
}
if (currValue == null) {
currValue = getSetFunction(session);
}
Object newValue = nodes[LEFT].opType == OpTypes.ASTERISK
? ValuePool.INTEGER_1
: nodes[LEFT].getValue(session);
currValue.add(newValue);
return currValue;
}
SetFunction getSetFunction(Session session) {
return new SetFunctionValueAggregate(session, opType,
nodes[LEFT].dataType, dataType,
isDistinctAggregate);
}
/**
* Get the result of a SetFunction or an ordinary value
*
* @param session session
* @param currValue instance of set function or value
* @return object
*/
public Object getAggregatedValue(Session session, SetFunction currValue) {
if (currValue == null) {
return opType == OpTypes.COUNT ? Long.valueOf(0)
: null;
}
return currValue.getValue();
}
public Expression getCondition() {
return nodes[RIGHT];
}
public boolean hasCondition() {
return !nodes[RIGHT].isTrue();
}
public void setCondition(ExpressionLogical e) {
nodes[RIGHT] = e;
}
}