/* Copyright (c) 2001-2010, 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.HsqlNameManager.HsqlName;
import org.hsqldb.HsqlNameManager.SimpleName;
import org.hsqldb.ParserDQL.CompileContext;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayListIdentity;
import org.hsqldb.lib.HsqlArrayList;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.lib.OrderedHashSet;
import org.hsqldb.lib.OrderedIntHashSet;
import org.hsqldb.lib.Set;
import org.hsqldb.navigator.RowSetNavigatorData;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.result.Result;
import org.hsqldb.types.ArrayType;
import org.hsqldb.types.CharacterType;
import org.hsqldb.types.NullType;
import org.hsqldb.types.Type;
/**
* Expression class.
*
* @author Campbell Boucher-Burnett (boucherb@users dot sourceforge.net)
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 1.9.0
* @since 1.9.0
*/
public class Expression implements Cloneable {
public static final int LEFT = 0;
public static final int RIGHT = 1;
public static final int UNARY = 1;
public static final int BINARY = 2;
//
//
static final Expression[] emptyArray = new Expression[]{};
//
static final Expression EXPR_TRUE = new ExpressionLogical(true);
static final Expression EXPR_FALSE = new ExpressionLogical(false);
//
static final OrderedIntHashSet aggregateFunctionSet =
new OrderedIntHashSet();
static {
aggregateFunctionSet.add(OpTypes.COUNT);
aggregateFunctionSet.add(OpTypes.SUM);
aggregateFunctionSet.add(OpTypes.MIN);
aggregateFunctionSet.add(OpTypes.MAX);
aggregateFunctionSet.add(OpTypes.AVG);
aggregateFunctionSet.add(OpTypes.EVERY);
aggregateFunctionSet.add(OpTypes.SOME);
aggregateFunctionSet.add(OpTypes.STDDEV_POP);
aggregateFunctionSet.add(OpTypes.STDDEV_SAMP);
aggregateFunctionSet.add(OpTypes.VAR_POP);
aggregateFunctionSet.add(OpTypes.VAR_SAMP);
aggregateFunctionSet.add(OpTypes.USER_AGGREGATE);
}
static final OrderedIntHashSet columnExpressionSet =
new OrderedIntHashSet();
static {
columnExpressionSet.add(OpTypes.COLUMN);
}
static final OrderedIntHashSet subqueryExpressionSet =
new OrderedIntHashSet();
static {
subqueryExpressionSet.add(OpTypes.ROW_SUBQUERY);
subqueryExpressionSet.add(OpTypes.TABLE_SUBQUERY);
}
static final OrderedIntHashSet subqueryAggregateExpressionSet =
new OrderedIntHashSet();
static {
subqueryAggregateExpressionSet.add(OpTypes.COUNT);
subqueryAggregateExpressionSet.add(OpTypes.SUM);
subqueryAggregateExpressionSet.add(OpTypes.MIN);
subqueryAggregateExpressionSet.add(OpTypes.MAX);
subqueryAggregateExpressionSet.add(OpTypes.AVG);
subqueryAggregateExpressionSet.add(OpTypes.EVERY);
subqueryAggregateExpressionSet.add(OpTypes.SOME);
subqueryAggregateExpressionSet.add(OpTypes.STDDEV_POP);
subqueryAggregateExpressionSet.add(OpTypes.STDDEV_SAMP);
subqueryAggregateExpressionSet.add(OpTypes.VAR_POP);
subqueryAggregateExpressionSet.add(OpTypes.VAR_SAMP);
subqueryAggregateExpressionSet.add(OpTypes.USER_AGGREGATE);
//
subqueryAggregateExpressionSet.add(OpTypes.TABLE_SUBQUERY);
subqueryAggregateExpressionSet.add(OpTypes.ROW_SUBQUERY);
}
static final OrderedIntHashSet functionExpressionSet =
new OrderedIntHashSet();
static {
functionExpressionSet.add(OpTypes.SQL_FUNCTION);
functionExpressionSet.add(OpTypes.FUNCTION);
}
static final OrderedIntHashSet emptyExpressionSet =
new OrderedIntHashSet();
// type
protected int opType;
// type qualifier
protected int exprSubType;
//
SimpleName alias;
// aggregate
private boolean isAggregate;
// VALUE
protected Object valueData;
protected Expression[] nodes;
Type[] nodeDataTypes;
// QUERY - in single value selects, IN, EXISTS etc.
SubQuery subQuery;
// for query and value lists, etc
boolean isCorrelated;
// for COLUMN
int columnIndex = -1;
// data type
protected Type dataType;
//
int queryTableColumnIndex = -1; // >= 0 when it is used for order by
// index of a session-dependent field
int parameterIndex = -1;
//
int rangePosition = -1;
//
boolean isColumnEqual;
Expression(int type) {
opType = type;
nodes = emptyArray;
}
// IN condition optimisation
/**
* Creates a SUBQUERY expression.
*/
Expression(int type, SubQuery sq) {
switch (type) {
case OpTypes.ARRAY :
opType = OpTypes.ARRAY;
break;
case OpTypes.ARRAY_SUBQUERY :
opType = OpTypes.ARRAY_SUBQUERY;
break;
case OpTypes.TABLE_SUBQUERY :
opType = OpTypes.TABLE_SUBQUERY;
break;
case OpTypes.ROW_SUBQUERY :
case OpTypes.SCALAR_SUBQUERY :
opType = OpTypes.ROW_SUBQUERY;
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
nodes = emptyArray;
subQuery = sq;
}
/**
* ROW, ARRAY etc.
*/
Expression(int type, Expression[] list) {
this(type);
this.nodes = list;
}
static String getContextSQL(Expression expression) {
if (expression == null) {
return null;
}
String ddl = expression.getSQL();
switch (expression.opType) {
case OpTypes.VALUE :
case OpTypes.COLUMN :
case OpTypes.ROW :
case OpTypes.FUNCTION :
case OpTypes.SQL_FUNCTION :
case OpTypes.ALTERNATIVE :
case OpTypes.CASEWHEN :
case OpTypes.CAST :
return ddl;
}
StringBuffer sb = new StringBuffer();
ddl = sb.append('(').append(ddl).append(')').toString();
return ddl;
}
/**
* For use with CHECK constraints. Under development.
*
* Currently supports a subset of expressions and is suitable for CHECK
* search conditions that refer only to the inserted/updated row.
*
* For full DDL reporting of VIEW select queries and CHECK search
* conditions, future improvements here are dependent upon improvements to
* SELECT query parsing, so that it is performed in a number of passes.
* An early pass should result in the query turned into an Expression tree
* that contains the information in the original SQL without any
* alterations, and with tables and columns all resolved. This Expression
* can then be preserved for future use. Table and column names that
* are not user-defined aliases should be kept as the HsqlName structures
* so that table or column renaming is reflected in the precompiled
* query.
*/
public String getSQL() {
StringBuffer sb = new StringBuffer(64);
switch (opType) {
case OpTypes.VALUE :
if (valueData == null) {
return Tokens.T_NULL;
}
return dataType.convertToSQLString(valueData);
case OpTypes.ROW :
sb.append('(');
for (int i = 0; i < nodes.length; i++) {
if (i > 0) {
sb.append(',');
}
sb.append(nodes[i].getSQL());
}
sb.append(')');
return sb.toString();
//
case OpTypes.TABLE :
for (int i = 0; i < nodes.length; i++) {
if (i > 0) {
sb.append(',');
}
sb.append(nodes[i].getSQL());
}
return sb.toString();
}
switch (opType) {
case OpTypes.ARRAY :
sb.append(Tokens.T_ARRAY).append('[');
for (int i = 0; i < nodes.length; i++) {
if (i > 0) {
sb.append(',');
}
sb.append(nodes[i].getSQL());
}
sb.append(']');
break;
case OpTypes.ARRAY_SUBQUERY :
//
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
sb.append('(');
sb.append(')');
break;
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
return sb.toString();
}
protected String describe(Session session, int blanks) {
StringBuffer sb = new StringBuffer(64);
sb.append('\n');
for (int i = 0; i < blanks; i++) {
sb.append(' ');
}
switch (opType) {
case OpTypes.VALUE :
sb.append("VALUE = ").append(valueData);
sb.append(", TYPE = ").append(dataType.getNameString());
return sb.toString();
case OpTypes.ARRAY :
sb.append("ARRAY ");
return sb.toString();
case OpTypes.ARRAY_SUBQUERY :
sb.append("ARRAY SUBQUERY");
return sb.toString();
//
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
sb.append("QUERY ");
sb.append(subQuery.queryExpression.describe(session, blanks));
return sb.toString();
case OpTypes.ROW :
sb.append("ROW = ");
for (int i = 0; i < nodes.length; i++) {
sb.append(nodes[i].describe(session, blanks + 1));
sb.append(' ');
}
break;
case OpTypes.TABLE :
sb.append("VALUELIST ");
for (int i = 0; i < nodes.length; i++) {
sb.append(nodes[i].describe(session, blanks + 1));
sb.append(' ');
}
break;
}
return sb.toString();
}
/**
* Set the data type
*/
void setDataType(Session session, Type type) {
if (opType == OpTypes.VALUE) {
valueData = type.convertToType(session, valueData, dataType);
}
dataType = type;
}
public boolean equals(Expression other) {
if (other == this) {
return true;
}
if (other == null) {
return false;
}
if (opType != other.opType || exprSubType != other.exprSubType
|| !equals(dataType, other.dataType)) {
return false;
}
switch (opType) {
case OpTypes.SIMPLE_COLUMN :
return this.columnIndex == other.columnIndex;
case OpTypes.VALUE :
return equals(valueData, other.valueData);
case OpTypes.ARRAY :
//
case OpTypes.ARRAY_SUBQUERY :
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
return (subQuery.queryExpression.isEquivalent(
other.subQuery.queryExpression));
default :
return equals(nodes, other.nodes)
&& equals(subQuery, other.subQuery);
}
}
public boolean equals(Object other) {
if (other == this) {
return true;
}
if (other instanceof Expression) {
return equals((Expression) other);
}
return false;
}
public int hashCode() {
int val = opType + exprSubType;
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
val += nodes[i].hashCode();
}
}
return val;
}
static boolean equals(Object o1, Object o2) {
if (o1 == o2) {
return true;
}
return (o1 == null) ? o2 == null
: o1.equals(o2);
}
static boolean equals(Expression[] row1, Expression[] row2) {
if (row1 == row2) {
return true;
}
if (row1.length != row2.length) {
return false;
}
int len = row1.length;
for (int i = 0; i < len; i++) {
Expression e1 = row1[i];
Expression e2 = row2[i];
boolean equals = (e1 == null) ? e2 == null
: e1.equals(e2);
if (!equals) {
return false;
}
}
return true;
}
/**
* For GROUP only.
*/
boolean isComposedOf(Expression exprList[], int start, int end,
OrderedIntHashSet excludeSet) {
if (opType == OpTypes.VALUE) {
return true;
}
if (excludeSet.contains(opType)) {
return true;
}
for (int i = start; i < end; i++) {
if (equals(exprList[i])) {
return true;
}
}
switch (opType) {
case OpTypes.LIKE :
case OpTypes.MATCH_SIMPLE :
case OpTypes.MATCH_PARTIAL :
case OpTypes.MATCH_FULL :
case OpTypes.MATCH_UNIQUE_SIMPLE :
case OpTypes.MATCH_UNIQUE_PARTIAL :
case OpTypes.MATCH_UNIQUE_FULL :
case OpTypes.UNIQUE :
case OpTypes.EXISTS :
case OpTypes.ARRAY :
case OpTypes.ARRAY_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
case OpTypes.ROW_SUBQUERY :
//
case OpTypes.COUNT :
case OpTypes.SUM :
case OpTypes.MIN :
case OpTypes.MAX :
case OpTypes.AVG :
case OpTypes.EVERY :
case OpTypes.SOME :
case OpTypes.STDDEV_POP :
case OpTypes.STDDEV_SAMP :
case OpTypes.VAR_POP :
case OpTypes.VAR_SAMP :
return false;
}
if (nodes.length == 0) {
return false;
}
boolean result = true;
for (int i = 0; i < nodes.length; i++) {
result &= (nodes[i] == null
|| nodes[i].isComposedOf(exprList, start, end,
excludeSet));
}
return result;
}
/**
* For HAVING only.
*/
boolean isComposedOf(OrderedHashSet expressions,
OrderedIntHashSet excludeSet) {
if (opType == OpTypes.VALUE || opType == OpTypes.DYNAMIC_PARAM
|| opType == OpTypes.PARAMETER || opType == OpTypes.VARIABLE) {
return true;
}
if (excludeSet.contains(opType)) {
return true;
}
for (int i = 0; i < expressions.size(); i++) {
if (equals(expressions.get(i))) {
return true;
}
}
switch (opType) {
case OpTypes.COUNT :
case OpTypes.SUM :
case OpTypes.MIN :
case OpTypes.MAX :
case OpTypes.AVG :
case OpTypes.EVERY :
case OpTypes.SOME :
case OpTypes.STDDEV_POP :
case OpTypes.STDDEV_SAMP :
case OpTypes.VAR_POP :
case OpTypes.VAR_SAMP :
return false;
}
/*
case OpCodes.LIKE :
case OpCodes.ALL :
case OpCodes.ANY :
case OpCodes.IN :
case OpCodes.MATCH_SIMPLE :
case OpCodes.MATCH_PARTIAL :
case OpCodes.MATCH_FULL :
case OpCodes.MATCH_UNIQUE_SIMPLE :
case OpCodes.MATCH_UNIQUE_PARTIAL :
case OpCodes.MATCH_UNIQUE_FULL :
case OpCodes.UNIQUE :
case OpCodes.EXISTS :
case OpCodes.TABLE_SUBQUERY :
case OpCodes.ROW_SUBQUERY :
*/
if (nodes.length == 0) {
return false;
}
boolean result = true;
for (int i = 0; i < nodes.length; i++) {
result &= (nodes[i] == null
|| nodes[i].isComposedOf(expressions, excludeSet));
}
return result;
}
Expression replaceColumnReferences(RangeVariable range,
Expression[] list) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
nodes[i] = nodes[i].replaceColumnReferences(range, list);
}
if (subQuery != null && subQuery.queryExpression != null) {
subQuery.queryExpression.replaceColumnReference(range, list);
}
return this;
}
void replaceRangeVariables(RangeVariable[] ranges,
RangeVariable[] newRanges) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
nodes[i].replaceRangeVariables(ranges, newRanges);
}
if (subQuery != null && subQuery.queryExpression != null) {
subQuery.queryExpression.replaceRangeVariables(ranges, newRanges);
}
}
void resetColumnReferences() {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
nodes[i].resetColumnReferences();
}
}
void convertToSimpleColumn(OrderedHashSet expressions,
OrderedHashSet replacements) {
if (opType == OpTypes.VALUE) {
return;
}
int index = expressions.getIndex(this);
if (index != -1) {
Expression e = (Expression) replacements.get(index);
nodes = emptyArray;
opType = OpTypes.SIMPLE_COLUMN;
columnIndex = e.columnIndex;
rangePosition = e.rangePosition;
return;
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
nodes[i].convertToSimpleColumn(expressions, replacements);
}
}
boolean isAggregate() {
return isAggregate;
}
void setAggregate() {
isAggregate = true;
}
boolean isSelfAggregate() {
return false;
}
/**
* Set the column alias
*/
void setAlias(SimpleName name) {
alias = name;
}
/**
* Get the column alias
*/
String getAlias() {
if (alias != null) {
return alias.name;
}
return "";
}
SimpleName getSimpleName() {
if (alias != null) {
return alias;
}
return null;
}
/**
* Returns the type of expression
*/
public int getType() {
return opType;
}
/**
* Returns the left node
*/
Expression getLeftNode() {
return nodes.length > 0 ? nodes[LEFT]
: null;
}
/**
* Returns the right node
*/
Expression getRightNode() {
return nodes.length > 1 ? nodes[RIGHT]
: null;
}
void setLeftNode(Expression e) {
nodes[LEFT] = e;
}
void setRightNode(Expression e) {
nodes[RIGHT] = e;
}
void setSubType(int i) {
exprSubType = i;
}
/**
* Returns the range variable for a COLUMN expression
*/
RangeVariable getRangeVariable() {
return null;
}
/**
* return the expression for an alias used in an ORDER BY clause
*/
Expression replaceAliasInOrderBy(Expression[] columns, int length) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
nodes[i] = nodes[i].replaceAliasInOrderBy(columns, length);
}
return this;
}
/**
* Find a range variable with the given table alias
*/
int findMatchingRangeVariableIndex(RangeVariable[] rangeVarArray) {
return -1;
}
/**
* collects all range variables in expression tree
*/
void collectRangeVariables(RangeVariable[] rangeVariables, Set set) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
nodes[i].collectRangeVariables(rangeVariables, set);
}
}
if (subQuery != null && subQuery.queryExpression != null) {
HsqlList unresolvedExpressions =
subQuery.queryExpression.getUnresolvedExpressions();
if (unresolvedExpressions != null) {
for (int i = 0; i < unresolvedExpressions.size(); i++) {
Expression e = (Expression) unresolvedExpressions.get(i);
e.collectRangeVariables(rangeVariables, set);
}
}
}
}
/**
* collects all schema objects
*/
void collectObjectNames(Set set) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
nodes[i].collectObjectNames(set);
}
}
if (subQuery != null) {
if (subQuery.queryExpression != null) {
subQuery.queryExpression.collectObjectNames(set);
}
}
}
/**
* return true if given RangeVariable is used in expression tree
*/
boolean hasReference(RangeVariable range) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
if (nodes[i].hasReference(range)) {
return true;
}
}
}
if (subQuery != null && subQuery.queryExpression != null) {
if (subQuery.queryExpression.hasReference(range)) {
return true;
}
}
return false;
}
/**
* resolve tables and collect unresolved column expressions
*/
public HsqlList resolveColumnReferences(RangeVariable[] rangeVarArray,
HsqlList unresolvedSet) {
return resolveColumnReferences(rangeVarArray, rangeVarArray.length,
unresolvedSet, true);
}
public HsqlList resolveColumnReferences(RangeVariable[] rangeVarArray,
int rangeCount, HsqlList unresolvedSet, boolean acceptsSequences) {
if (opType == OpTypes.VALUE) {
return unresolvedSet;
}
switch (opType) {
case OpTypes.CASEWHEN :
acceptsSequences = false;
break;
case OpTypes.TABLE : {
HsqlList localSet = null;
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
localSet = nodes[i].resolveColumnReferences(
RangeVariable.emptyArray, localSet);
}
if (localSet != null) {
isCorrelated = true;
if (subQuery != null) {
subQuery.setCorrelated();
}
for (int i = 0; i < localSet.size(); i++) {
Expression e = (Expression) localSet.get(i);
unresolvedSet =
e.resolveColumnReferences(rangeVarArray,
unresolvedSet);
}
unresolvedSet = Expression.resolveColumnSet(rangeVarArray,
rangeVarArray.length, localSet, unresolvedSet);
}
return unresolvedSet;
}
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
unresolvedSet = nodes[i].resolveColumnReferences(rangeVarArray,
rangeCount, unresolvedSet, acceptsSequences);
}
switch (opType) {
case OpTypes.ARRAY :
break;
case OpTypes.ARRAY_SUBQUERY :
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY : {
QueryExpression queryExpression = subQuery.queryExpression;
if (!queryExpression.areColumnsResolved()) {
isCorrelated = true;
subQuery.setCorrelated();
// take to enclosing context
if (unresolvedSet == null) {
unresolvedSet = new ArrayListIdentity();
}
unresolvedSet.addAll(
queryExpression.getUnresolvedExpressions());
}
break;
}
default :
}
return unresolvedSet;
}
public OrderedHashSet getUnkeyedColumns(OrderedHashSet unresolvedSet) {
if (opType == OpTypes.VALUE) {
return unresolvedSet;
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == null) {
continue;
}
unresolvedSet = nodes[i].getUnkeyedColumns(unresolvedSet);
}
switch (opType) {
case OpTypes.ARRAY :
case OpTypes.ARRAY_SUBQUERY :
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
if (subQuery != null) {
if (unresolvedSet == null) {
unresolvedSet = new OrderedHashSet();
}
unresolvedSet.add(this);
}
break;
}
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);
}
}
switch (opType) {
case OpTypes.VALUE :
break;
case OpTypes.TABLE :
/** @todo - should it fall through */
break;
case OpTypes.ROW :
nodeDataTypes = new Type[nodes.length];
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
nodeDataTypes[i] = nodes[i].dataType;
}
}
break;
case OpTypes.ARRAY : {
boolean hasUndefined = false;
for (int i = 0; i < nodes.length; i++) {
if (nodes[i].dataType == null) {
hasUndefined = true;
} else {
dataType = Type.getAggregateType(dataType,
nodes[i].dataType);
}
}
if (hasUndefined) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i].dataType == null) {
nodes[i].dataType = dataType;
}
}
}
dataType = new ArrayType(dataType, nodes.length);
return;
}
case OpTypes.ARRAY_SUBQUERY : {
QueryExpression queryExpression = subQuery.queryExpression;
queryExpression.resolveTypes(session);
subQuery.prepareTable(session);
nodeDataTypes = queryExpression.getColumnTypes();
dataType = nodeDataTypes[0];
if (nodeDataTypes.length > 1) {
throw Error.error(ErrorCode.X_42564);
}
dataType = new ArrayType(dataType, nodes.length);
break;
}
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY : {
QueryExpression queryExpression = subQuery.queryExpression;
queryExpression.resolveTypes(session);
subQuery.prepareTable(session);
nodeDataTypes = queryExpression.getColumnTypes();
dataType = nodeDataTypes[0];
break;
}
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
void setAsConstantValue(Session session) {
valueData = getValue(session);
opType = OpTypes.VALUE;
nodes = emptyArray;
}
void setAsConstantValue(Object value) {
valueData = value;
opType = OpTypes.VALUE;
nodes = emptyArray;
}
void prepareTable(Session session, Expression row, int degree) {
if (nodeDataTypes != null) {
return;
}
for (int i = 0; i < nodes.length; i++) {
Expression e = nodes[i];
if (e.opType == OpTypes.ROW) {
if (degree != e.nodes.length) {
throw Error.error(ErrorCode.X_42564);
}
} else if (degree == 1) {
nodes[i] = new Expression(OpTypes.ROW);
nodes[i].nodes = new Expression[]{ e };
} else {
throw Error.error(ErrorCode.X_42564);
}
}
nodeDataTypes = new Type[degree];
for (int j = 0; j < degree; j++) {
Type type = row == null ? null
: row.nodes[j].dataType;
for (int i = 0; i < nodes.length; i++) {
type = Type.getAggregateType(nodes[i].nodes[j].dataType, type);
}
if (type == null) {
throw Error.error(ErrorCode.X_42567);
}
nodeDataTypes[j] = type;
if (row != null && row.nodes[j].isUnresolvedParam()) {
row.nodes[j].dataType = type;
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i].nodes[j].isUnresolvedParam()) {
nodes[i].nodes[j].dataType = nodeDataTypes[j];
continue;
}
if (nodes[i].nodes[j].opType == OpTypes.VALUE) {
if (nodes[i].nodes[j].valueData == null) {
nodes[i].nodes[j].dataType = nodeDataTypes[j];
}
}
}
if (nodeDataTypes[j].isCharacterType()
&& !((CharacterType) nodeDataTypes[j])
.isEqualIdentical()) {
// collation issues
}
}
}
/**
* Details of IN condition optimisation for 1.9.0
* Predicates with SELECT are QUERY expressions
*
* Predicates with IN list
*
* Parser adds a SubQuery to the list for each predicate
* At type resolution IN lists that are entirely fixed constant or parameter
* values are selected for possible optimisation. The flags:
*
* IN expression right side isCorrelated == true if there are non-constant,
* non-param expressions in the list (Expressions may have to be resolved
* against the full set of columns of the query, so must be re-evaluated
* for each row and evaluated after all the joins have been made)
*
* VALUELIST expression isFixedConstantValueList == true when all
* expressions are fixed constant and none is a param. With this flag,
* a single-column VALUELIST can be accessed as a HashMap.
*
* Predicates may be optimised as joins if isCorrelated == false
*
*/
void insertValuesIntoSubqueryTable(Session session,
PersistentStore store) {
for (int i = 0; i < nodes.length; i++) {
Object[] data = nodes[i].getRowValue(session);
for (int j = 0; j < nodeDataTypes.length; j++) {
data[j] = nodeDataTypes[j].convertToType(session, data[j],
nodes[i].nodes[j].dataType);
}
Row row = (Row) store.getNewCachedObject(session, data);
try {
store.indexRow(session, row);
} catch (HsqlException e) {}
}
}
/**
* Returns the name of a column as string
*
* @return column name
*/
String getColumnName() {
return getAlias();
}
ColumnSchema getColumn() {
return null;
}
/**
* Returns the column index in the table
*/
int getColumnIndex() {
return columnIndex;
}
/**
* Returns the data type
*/
Type getDataType() {
return dataType;
}
Type getNodeDataType(int i) {
if (nodeDataTypes == null) {
if (i > 0) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
return dataType;
} else {
return nodeDataTypes[i];
}
}
Type[] getNodeDataTypes() {
if (nodeDataTypes == null) {
return new Type[]{ dataType };
} else {
return nodeDataTypes;
}
}
int getDegree() {
switch (opType) {
case OpTypes.ROW :
return nodes.length;
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY :
if (subQuery == null) {
// todo
}
return subQuery.queryExpression.getColumnCount();
default :
return 1;
}
}
public Table getTable() {
return subQuery == null ? null
: subQuery.getTable();
}
public void materialise(Session session) {
if (subQuery == null) {
return;
}
if (subQuery.isCorrelated()) {
subQuery.materialiseCorrelated(session);
} else {
subQuery.materialise(session);
}
}
Object getValue(Session session, Type type) {
Object o = getValue(session);
if (o == null || dataType == type) {
return o;
}
return type.convertToType(session, o, dataType);
}
public Object getConstantValueNoCheck(Session session) {
try {
return getValue(session);
} catch (HsqlException e) {
return null;
}
}
public Object[] getRowValue(Session session) {
switch (opType) {
case OpTypes.ROW : {
Object[] data = new Object[nodes.length];
for (int i = 0; i < nodes.length; i++) {
data[i] = nodes[i].getValue(session);
}
return data;
}
case OpTypes.ROW_SUBQUERY :
case OpTypes.TABLE_SUBQUERY : {
return subQuery.queryExpression.getValues(session);
}
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
public Object getValue(Session session) {
switch (opType) {
case OpTypes.VALUE :
return valueData;
case OpTypes.SIMPLE_COLUMN : {
Object[] data =
session.sessionContext.rangeIterators[rangePosition]
.getCurrent();
return data[columnIndex];
}
case OpTypes.ROW : {
if (nodes.length == 1) {
return nodes[0].getValue(session);
}
Object[] row = new Object[nodes.length];
for (int i = 0; i < nodes.length; i++) {
row[i] = nodes[i].getValue(session);
}
return row;
}
case OpTypes.ARRAY : {
Object[] array = new Object[nodes.length];
for (int i = 0; i < nodes.length; i++) {
array[i] = nodes[i].getValue(session);
}
return array;
}
case OpTypes.ARRAY_SUBQUERY : {
subQuery.materialiseCorrelated(session);
RowSetNavigatorData nav = subQuery.getNavigator(session);
int size = nav.getSize();
Object[] array = new Object[size];
nav.beforeFirst();
for (int i = 0; nav.hasNext(); i++) {
Object[] data = nav.getNextRowData();
array[i] = data[0];
}
return array;
}
case OpTypes.TABLE_SUBQUERY :
case OpTypes.ROW_SUBQUERY : {
subQuery.materialiseCorrelated(session);
Object[] value = subQuery.getValues(session);
if (value.length == 1) {
return ((Object[]) value)[0];
}
return value;
}
default :
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}
public Result getResult(Session session) {
switch (opType) {
case OpTypes.ARRAY : {
RowSetNavigatorData navigator = subQuery.getNavigator(session);
Object[] array = new Object[navigator.getSize()];
navigator.beforeFirst();
for (int i = 0; navigator.hasNext(); i++) {
Object[] data = navigator.getNext();
array[i] = data[0];
}
return Result.newPSMResult(array);
}
case OpTypes.TABLE_SUBQUERY : {
subQuery.materialiseCorrelated(session);
RowSetNavigatorData navigator = subQuery.getNavigator(session);
Result result = Result.newResult(navigator);
result.metaData = subQuery.queryExpression.getMetaData();
return result;
}
default : {
Object value = getValue(session);
return Result.newPSMResult(value);
}
}
}
boolean testCondition(Session session) {
return Boolean.TRUE.equals(getValue(session));
}
static int countNulls(Object[] a) {
int nulls = 0;
for (int i = 0; i < a.length; i++) {
if (a[i] == null) {
nulls++;
}
}
return nulls;
}
public boolean isIndexable(RangeVariable range) {
return false;
}
static void convertToType(Session session, Object[] data, Type[] dataType,
Type[] newType) {
for (int i = 0; i < data.length; i++) {
data[i] = newType[i].convertToType(session, data[i], dataType[i]);
}
}
/**
* Returns a Select object that can be used for checking the contents
* of an existing table against the given CHECK search condition.
*/
static QuerySpecification getCheckSelect(Session session, Table t,
Expression e) {
CompileContext compileContext = new CompileContext(session, null);
QuerySpecification s = new QuerySpecification(compileContext);
RangeVariable[] ranges = new RangeVariable[]{
new RangeVariable(t, null, null, null, compileContext) };
e.resolveCheckOrGenExpression(session, ranges, true);
s.exprColumns = new Expression[1];
s.exprColumns[0] = EXPR_TRUE;
s.rangeVariables = ranges;
if (Type.SQL_BOOLEAN != e.getDataType()) {
throw Error.error(ErrorCode.X_42568);
}
Expression condition = new ExpressionLogical(OpTypes.NOT, e);
s.queryCondition = condition;
s.resolveReferences(session);
s.resolveTypes(session);
return s;
}
public void resolveCheckOrGenExpression(Session session,
RangeVariable[] ranges, boolean isCheck) {
boolean nonDeterministic = false;
OrderedHashSet set = new OrderedHashSet();
HsqlList unresolved = resolveColumnReferences(ranges, null);
ExpressionColumn.checkColumnsResolved(unresolved);
resolveTypes(session, null);
collectAllExpressions(set, Expression.subqueryAggregateExpressionSet,
Expression.emptyExpressionSet);
if (!set.isEmpty()) {
throw Error.error(ErrorCode.X_42512);
}
collectAllExpressions(set, Expression.functionExpressionSet,
Expression.emptyExpressionSet);
for (int i = 0; i < set.size(); i++) {
Expression current = (Expression) set.get(i);
if (current.opType == OpTypes.FUNCTION) {
if (!((FunctionSQLInvoked) current).isDeterministic()) {
throw Error.error(ErrorCode.X_42512);
}
}
if (current.opType == OpTypes.SQL_FUNCTION) {
if (!((FunctionSQL) current).isDeterministic()) {
if (isCheck) {
nonDeterministic = true;
continue;
}
throw Error.error(ErrorCode.X_42512);
}
}
}
if (isCheck && nonDeterministic) {
HsqlArrayList list = new HsqlArrayList();
RangeVariableResolver.decomposeAndConditions(this, list);
for (int i = 0; i < list.size(); i++) {
nonDeterministic = true;
Expression e = (Expression) list.get(i);
Expression e1;
if (e instanceof ExpressionLogical) {
boolean b = ((ExpressionLogical) e).convertToSmaller();
if (!b) {
break;
}
e1 = e.getRightNode();
e = e.getLeftNode();
if (!e.dataType.isDateTimeType()) {
nonDeterministic = true;
break;
}
if (e.hasNonDeterministicFunction()) {
nonDeterministic = true;
break;
}
// both sides are actually consistent regarding timeZone
// e.dataType.isDateTimeTypeWithZone();
if (e1 instanceof ExpressionArithmetic) {
if (opType == OpTypes.ADD) {
if (e1.getRightNode()
.hasNonDeterministicFunction()) {
e1.swapLeftAndRightNodes();
}
} else if (opType == OpTypes.SUBTRACT) {}
else {
break;
}
if (e1.getRightNode().hasNonDeterministicFunction()) {
break;
}
e1 = e1.getLeftNode();
}
if (e1.opType == OpTypes.SQL_FUNCTION) {
FunctionSQL function = (FunctionSQL) e1;
switch (function.funcType) {
case FunctionSQL.FUNC_CURRENT_DATE :
case FunctionSQL.FUNC_CURRENT_TIMESTAMP :
case FunctionSQL.FUNC_LOCALTIMESTAMP :
nonDeterministic = false;
continue;
default :
break;
}
break;
}
break;
} else {
break;
}
}
if (nonDeterministic) {
throw Error.error(ErrorCode.X_42512);
}
}
set.clear();
collectObjectNames(set);
for (int i = 0; i < set.size(); i++) {
HsqlName name = (HsqlName) set.get(i);
switch (name.type) {
case SchemaObject.COLUMN : {
if (isCheck) {
break;
}
int colIndex = ranges[0].rangeTable.findColumn(name.name);
ColumnSchema column =
ranges[0].rangeTable.getColumn(colIndex);
if (column.isGenerated()) {
throw Error.error(ErrorCode.X_42512);
}
break;
}
case SchemaObject.SEQUENCE : {
throw Error.error(ErrorCode.X_42512);
}
case SchemaObject.SPECIFIC_ROUTINE : {
Routine routine =
(Routine) session.database.schemaManager
.getSchemaObject(name);
if (!routine.isDeterministic()) {
throw Error.error(ErrorCode.X_42512);
}
int impact = routine.getDataImpact();
if (impact == Routine.READS_SQL
|| impact == Routine.MODIFIES_SQL) {
throw Error.error(ErrorCode.X_42512);
}
}
}
}
set.clear();
}
boolean isUnresolvedParam() {
return false;
}
boolean isDynamicParam() {
return false;
}
boolean hasNonDeterministicFunction() {
OrderedHashSet list = null;
list = collectAllExpressions(list, Expression.functionExpressionSet,
Expression.emptyExpressionSet);
if (list == null) {
return false;
}
for (int j = 0; j < list.size(); j++) {
Expression current = (Expression) list.get(j);
if (current.opType == OpTypes.FUNCTION) {
if (!((FunctionSQLInvoked) current).isDeterministic()) {
return true;
}
} else if (current.opType == OpTypes.SQL_FUNCTION) {
if (!((FunctionSQL) current).isDeterministic()) {
return true;
}
}
}
return false;
}
void swapLeftAndRightNodes() {
Expression temp = nodes[LEFT];
nodes[LEFT] = nodes[RIGHT];
nodes[RIGHT] = temp;
}
void setAttributesAsColumn(ColumnSchema column, boolean isWritable) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
String getValueClassName() {
Type type = dataType == null ? NullType.getNullType()
: dataType;
return type.getJDBCClassName();
}
/**
* collect all expressions of a set of expression types appearing anywhere
* in a select statement and its subselects, etc.
*/
OrderedHashSet collectAllExpressions(OrderedHashSet set,
OrderedIntHashSet typeSet,
OrderedIntHashSet stopAtTypeSet) {
if (stopAtTypeSet.contains(opType)) {
return set;
}
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
set = nodes[i].collectAllExpressions(set, typeSet,
stopAtTypeSet);
}
}
if (typeSet.contains(opType)) {
if (set == null) {
set = new OrderedHashSet();
}
set.add(this);
}
if (subQuery != null && subQuery.queryExpression != null) {
set = subQuery.queryExpression.collectAllExpressions(set, typeSet,
stopAtTypeSet);
}
return set;
}
public OrderedHashSet getSubqueries() {
return collectAllSubqueries(null);
}
OrderedHashSet collectAllSubqueries(OrderedHashSet set) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
set = nodes[i].collectAllSubqueries(set);
}
}
if (subQuery != null) {
if (set == null) {
set = new OrderedHashSet();
}
set.add(subQuery);
if (subQuery.queryExpression != null) {
OrderedHashSet tempSet =
subQuery.queryExpression.getSubqueries();
set = OrderedHashSet.addAll(set, tempSet);
}
}
return set;
}
/**
* isCorrelated
*/
public boolean isCorrelated() {
if (subQuery == null) {
return false;
}
return subQuery.isCorrelated();
}
/**
* checkValidCheckConstraint
*/
public void checkValidCheckConstraint() {
OrderedHashSet set = null;
set = collectAllExpressions(set, subqueryAggregateExpressionSet,
emptyExpressionSet);
if (set != null && !set.isEmpty()) {
throw Error.error(ErrorCode.X_0A000,
"subquery in check constraint");
}
}
static HsqlList resolveColumnSet(RangeVariable[] rangeVars,
int rangeCount, HsqlList sourceSet,
HsqlList targetSet) {
if (sourceSet == null) {
return targetSet;
}
for (int i = 0; i < sourceSet.size(); i++) {
Expression e = (Expression) sourceSet.get(i);
targetSet = e.resolveColumnReferences(rangeVars, rangeCount,
targetSet, true);
}
return targetSet;
}
Expression getIndexableExpression(RangeVariable rangeVar) {
return null;
}
public Expression duplicate() {
Expression e = null;
try {
e = (Expression) super.clone();
e.nodes = nodes.clone();
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] != null) {
e.nodes[i] = nodes[i].duplicate();
}
}
} catch (CloneNotSupportedException ex) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
return e;
}
void replaceNode(Expression existing, Expression replacement) {
for (int i = 0; i < nodes.length; i++) {
if (nodes[i] == existing) {
replacement.alias = nodes[i].alias;
nodes[i] = replacement;
return;
}
}
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
public Object updateAggregatingValue(Session session, Object currValue) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
public Object getAggregatedValue(Session session, Object currValue) {
throw Error.runtimeError(ErrorCode.U_S0500, "Expression");
}
}