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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.ParserDQL.CompileContext;
import org.hsqldb.RangeVariable.RangeVariableConditions;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.Index.IndexUse;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.lib.HashMap;
import org.hsqldb.lib.HsqlArrayList;
import org.hsqldb.lib.HsqlList;
import org.hsqldb.lib.IntKeyIntValueHashMap;
import org.hsqldb.lib.Iterator;
import org.hsqldb.lib.MultiValueHashMap;
import org.hsqldb.lib.OrderedHashSet;
import org.hsqldb.lib.OrderedIntHashSet;
import org.hsqldb.persist.PersistentStore;
/**
* Determines how JOIN and WHERE expressions are used in query
* processing and which indexes are used for table access.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 1.9.0
*/
public class RangeVariableResolver {
Session session;
QuerySpecification select;
RangeVariable[] rangeVariables;
Expression conditions;
OrderedHashSet rangeVarSet = new OrderedHashSet();
CompileContext compileContext;
SortAndSlice sortAndSlice = SortAndSlice.noSort;
boolean reorder;
//
HsqlArrayList[] tempJoinExpressions;
HsqlArrayList[] joinExpressions;
HsqlArrayList[] whereExpressions;
HsqlArrayList queryConditions = new HsqlArrayList();
//
Expression[] inExpressions;
boolean[] inInJoin;
int inExpressionCount = 0;
boolean expandInExpression = true;
//
int firstLeftJoinIndex;
int firstRightJoinIndex;
int lastRightJoinIndex;
int firstLateralJoinIndex;
int firstOuterJoinIndex;
int lastOuterJoinIndex;
//
OrderedIntHashSet colIndexSetEqual = new OrderedIntHashSet();
IntKeyIntValueHashMap colIndexSetOther = new IntKeyIntValueHashMap();
OrderedHashSet tempSet = new OrderedHashSet();
HashMap tempMap = new HashMap();
MultiValueHashMap tempMultiMap = new MultiValueHashMap();
RangeVariableResolver(Session session, QuerySpecification select) {
this.session = session;
this.select = select;
this.rangeVariables = select.rangeVariables;
this.conditions = select.queryCondition;
this.compileContext = select.compileContext;
this.sortAndSlice = select.sortAndSlice;
this.reorder = true;
// this.expandInExpression = select.checkQueryCondition == null;
initialise();
}
RangeVariableResolver(Session session, RangeVariable[] rangeVariables,
Expression conditions,
CompileContext compileContext, boolean reorder) {
this.session = session;
this.rangeVariables = rangeVariables;
this.conditions = conditions;
this.compileContext = compileContext;
this.reorder = reorder;
initialise();
}
private void initialise() {
firstLeftJoinIndex = rangeVariables.length;
firstRightJoinIndex = rangeVariables.length;
firstLateralJoinIndex = rangeVariables.length;
firstOuterJoinIndex = rangeVariables.length;
inExpressions = new Expression[rangeVariables.length];
inInJoin = new boolean[rangeVariables.length];
tempJoinExpressions = new HsqlArrayList[rangeVariables.length];
for (int i = 0; i < rangeVariables.length; i++) {
tempJoinExpressions[i] = new HsqlArrayList();
}
joinExpressions = new HsqlArrayList[rangeVariables.length];
for (int i = 0; i < rangeVariables.length; i++) {
joinExpressions[i] = new HsqlArrayList();
}
whereExpressions = new HsqlArrayList[rangeVariables.length];
for (int i = 0; i < rangeVariables.length; i++) {
whereExpressions[i] = new HsqlArrayList();
}
queryConditions.clear();
}
void processConditions() {
if (session.sessionOptimization < 8) {
reorder = false;
}
decomposeAndConditions(session, conditions, queryConditions);
for (int i = 0; i < rangeVariables.length; i++) {
rangeVarSet.add(rangeVariables[i]);
if (rangeVariables[i].joinCondition == null) {
continue;
}
decomposeAndConditions(session, rangeVariables[i].joinCondition,
tempJoinExpressions[i]);
}
for (int j = 0; j < queryConditions.size(); j++) {
Expression e = (Expression) queryConditions.get(j);
if (e.isTrue()) {
continue;
}
if (e.isSingleColumnEqual || e.isColumnCondition) {
RangeVariable range = e.getLeftNode().getRangeVariable();
if (e.getLeftNode().opType == OpTypes.COLUMN
&& range != null) {
int index = rangeVarSet.getIndex(range);
if (index > 0) {
rangeVariables[index].isLeftJoin = false;
}
}
range = e.getRightNode().getRangeVariable();
if (e.getRightNode().opType == OpTypes.COLUMN
&& range != null) {
int index = rangeVarSet.getIndex(range);
if (index > 0) {
rangeVariables[index].isLeftJoin = false;
}
}
}
}
for (int i = 0; i < rangeVariables.length; i++) {
RangeVariable range = rangeVariables[i];
boolean isOuter = false;
if (range.isLeftJoin) {
if (firstLeftJoinIndex == rangeVariables.length) {
firstLeftJoinIndex = i;
}
isOuter = true;
}
if (range.isRightJoin) {
if (firstRightJoinIndex == rangeVariables.length) {
firstRightJoinIndex = i;
}
lastRightJoinIndex = i;
isOuter = true;
}
if (range.isLateral) {
if (firstLateralJoinIndex == rangeVariables.length) {
firstLateralJoinIndex = i;
}
isOuter = true;
}
if (isOuter) {
if (firstOuterJoinIndex == rangeVariables.length) {
firstOuterJoinIndex = i;
}
lastOuterJoinIndex = i;
}
}
expandConditions();
conditions = null;
reorder();
assignToLists();
assignToRangeVariables();
// rangePositionInJoin and the two bounds are used only together, regardless of any IN ranges added
if (select != null) {
select.startInnerRange = 0;
select.endInnerRange = rangeVariables.length;
if (firstRightJoinIndex < rangeVariables.length) {
select.startInnerRange = firstRightJoinIndex;
}
if (firstLeftJoinIndex < rangeVariables.length) {
select.endInnerRange = firstLeftJoinIndex;
}
}
for (int i = 0; i < rangeVariables.length; i++) {
rangeVariables[i].rangePositionInJoin = i;
}
if (expandInExpression && inExpressionCount != 0) {
setInConditionsAsTables();
}
}
/**
* Divides AND and OR conditions and assigns
*/
static Expression decomposeAndConditions(Session session, Expression e,
HsqlList conditions) {
if (e == null) {
return Expression.EXPR_TRUE;
}
Expression arg1 = e.getLeftNode();
Expression arg2 = e.getRightNode();
int type = e.getType();
if (type == OpTypes.AND) {
arg1 = decomposeAndConditions(session, arg1, conditions);
arg2 = decomposeAndConditions(session, arg2, conditions);
if (arg1.isTrue()) {
return arg2;
}
if (arg2.isTrue()) {
return arg1;
}
e.setLeftNode(arg1);
e.setRightNode(arg2);
return e;
} else if (type == OpTypes.EQUAL) {
if (arg1.getType() == OpTypes.ROW
&& arg2.getType() == OpTypes.ROW) {
for (int i = 0; i < arg1.nodes.length; i++) {
Expression part = new ExpressionLogical(arg1.nodes[i],
arg2.nodes[i]);
part.resolveTypes(session, null);
conditions.add(part);
}
return Expression.EXPR_TRUE;
}
}
if (!e.isTrue()) {
conditions.add(e);
}
return Expression.EXPR_TRUE;
}
/**
* Divides AND and OR conditions and assigns
*/
static Expression decomposeOrConditions(Expression e,
HsqlList conditions) {
if (e == null) {
return Expression.EXPR_FALSE;
}
Expression arg1 = e.getLeftNode();
Expression arg2 = e.getRightNode();
int type = e.getType();
if (type == OpTypes.OR) {
arg1 = decomposeOrConditions(arg1, conditions);
arg2 = decomposeOrConditions(arg2, conditions);
if (arg1.isFalse()) {
return arg2;
}
if (arg2.isFalse()) {
return arg1;
}
e = new ExpressionLogical(OpTypes.OR, arg1, arg2);
return e;
}
if (!e.isFalse()) {
conditions.add(e);
}
return Expression.EXPR_FALSE;
}
void expandConditions() {
HsqlArrayList[] array = tempJoinExpressions;
if (firstRightJoinIndex == rangeVariables.length) {
moveConditions(tempJoinExpressions, 0, firstOuterJoinIndex,
queryConditions, -1);
}
if (firstOuterJoinIndex < 2) {
return;
}
for (int i = 0; i < firstOuterJoinIndex; i++) {
moveConditions(tempJoinExpressions, 0, firstOuterJoinIndex,
tempJoinExpressions[i], i);
}
if (firstOuterJoinIndex < 3) {
return;
}
for (int i = 0; i < firstOuterJoinIndex; i++) {
HsqlArrayList list = array[i];
tempMultiMap.clear();
tempSet.clear();
tempMap.clear();
boolean hasValEqual = false;
boolean hasColEqual = false;
boolean hasChain = false;
for (int j = 0; j < list.size(); j++) {
Expression e = (Expression) list.get(j);
if (e.isTrue()) {
continue;
}
if (e.isSingleColumnEqual) {
hasValEqual = true;
if (e.getLeftNode().opType == OpTypes.COLUMN) {
tempMap.put(e.getLeftNode().getColumn(),
e.getRightNode());
} else if (e.getRightNode().opType == OpTypes.COLUMN) {
tempMap.put(e.getRightNode().getColumn(),
e.getLeftNode());
}
continue;
}
if (!e.isColumnEqual) {
continue;
}
if (e.getLeftNode().getRangeVariable()
== e.getRightNode().getRangeVariable()) {
continue;
}
if (e.getLeftNode().getRangeVariable() == null
|| e.getRightNode().getRangeVariable() == null) {
continue;
}
int idx =
rangeVarSet.getIndex(e.getLeftNode().getRangeVariable());
if (idx < 0) {
e.isSingleColumnEqual = true;
e.isSingleColumnCondition = true;
tempMap.put(e.getRightNode().getColumn(), e.getLeftNode());
continue;
}
if (idx >= firstOuterJoinIndex) {
continue;
}
idx = rangeVarSet.getIndex(
e.getRightNode().getRangeVariable());
if (idx < 0) {
e.isSingleColumnEqual = true;
e.isSingleColumnCondition = true;
tempMap.put(e.getRightNode().getColumn(), e.getLeftNode());
continue;
}
if (idx >= firstOuterJoinIndex) {
continue;
}
hasColEqual = true;
if (e.getLeftNode().getRangeVariable() == rangeVariables[i]) {
ColumnSchema column = e.getLeftNode().getColumn();
tempMultiMap.put(column, e.getRightNode());
if (tempMultiMap.valueCount(column) > 1) {
hasChain = true;
}
} else if (e.getRightNode().getRangeVariable()
== rangeVariables[i]) {
ColumnSchema column = e.getRightNode().getColumn();
tempMultiMap.put(column, e.getLeftNode());
if (tempMultiMap.valueCount(column) > 1) {
hasChain = true;
}
}
}
if (hasChain) {
Iterator keyIt = tempMultiMap.keySet().iterator();
while (keyIt.hasNext()) {
Object key = keyIt.next();
Iterator it = tempMultiMap.get(key);
tempSet.clear();
while (it.hasNext()) {
tempSet.add(it.next());
}
while (tempSet.size() > 1) {
Expression e1 =
(Expression) tempSet.remove(tempSet.size() - 1);
for (int j = 0; j < tempSet.size(); j++) {
Expression e2 = (Expression) tempSet.get(j);
closeJoinChain(array, e1, e2);
}
}
}
}
if (hasColEqual && hasValEqual) {
Iterator keyIt = tempMultiMap.keySet().iterator();
while (keyIt.hasNext()) {
Object key = keyIt.next();
Expression e1 = (Expression) tempMap.get(key);
if (e1 != null) {
Iterator it = tempMultiMap.get(key);
while (it.hasNext()) {
Expression e2 = (Expression) it.next();
Expression e = new ExpressionLogical(e1, e2);
int index =
rangeVarSet.getIndex(e2.getRangeVariable());
array[index].add(e);
}
}
}
}
}
}
void moveConditions(HsqlList[] lists, int rangeStart, int rangeLimit,
HsqlList list, int listIndex) {
for (int j = 0; j < list.size(); j++) {
Expression e = (Expression) list.get(j);
tempSet.clear();
e.collectRangeVariables(rangeVariables, tempSet);
int index = rangeVarSet.getSmallestIndex(tempSet);
if (index < rangeStart) {
continue;
}
index = rangeVarSet.getLargestIndex(tempSet);
if (index >= rangeLimit) {
continue;
}
if (index != listIndex) {
list.remove(j);
lists[index].add(e);
j--;
}
}
}
void closeJoinChain(HsqlList[] array, Expression e1, Expression e2) {
int idx1 = rangeVarSet.getIndex(e1.getRangeVariable());
int idx2 = rangeVarSet.getIndex(e2.getRangeVariable());
int index = idx1 > idx2 ? idx1
: idx2;
if (idx1 == -1 || idx2 == -1) {
return;
}
Expression e = new ExpressionLogical(e1, e2);
for (int i = 0; i < array[index].size(); i++) {
if (e.equals(array[index].get(i))) {
return;
}
}
array[index].add(e);
}
void reorder() {
if (!reorder) {
return;
}
if (rangeVariables.length == 1
|| firstRightJoinIndex != rangeVariables.length) {
return;
}
if (firstLeftJoinIndex == 1) {
return;
}
if (firstLateralJoinIndex != rangeVariables.length) {
return;
}
if (sortAndSlice.usingIndex
&& sortAndSlice.primaryTableIndex != null) {
return;
}
HsqlArrayList joins = new HsqlArrayList();
HsqlArrayList starts = new HsqlArrayList();
for (int i = 0; i < firstLeftJoinIndex; i++) {
HsqlArrayList tempJoins = tempJoinExpressions[i];
for (int j = 0; j < tempJoins.size(); j++) {
Expression e = (Expression) tempJoins.get(j);
if (e.isColumnEqual) {
joins.add(e);
} else if (e.isSingleColumnCondition) {
starts.add(e);
}
}
}
reorderRanges(starts, joins);
}
void reorderRanges(HsqlArrayList starts, HsqlArrayList joins) {
if (starts.size() == 0) {
return;
}
int position = -1;
RangeVariable range = null;
double cost = 1024;
for (int i = 0; i < firstLeftJoinIndex; i++) {
Table table = rangeVariables[i].rangeTable;
if (table instanceof TableDerived) {
continue;
}
collectIndexableColumns(rangeVariables[i], starts);
IndexUse[] indexes = table.getIndexForColumns(session,
colIndexSetEqual, OpTypes.EQUAL, false);
Index index = null;
for (int j = 0; j < indexes.length; j++) {
index = indexes[j].index;
double currentCost = searchCost(session, table, index,
indexes[j].columnCount,
OpTypes.EQUAL);
if (currentCost < cost) {
cost = currentCost;
position = i;
}
}
if (index == null) {
Iterator it = colIndexSetOther.keySet().iterator();
while (it.hasNext()) {
int colIndex = it.nextInt();
index = table.getIndexForColumn(session, colIndex);
if (index != null) {
cost = table.getRowStore(session).elementCount() / 2.0;
if (colIndexSetOther.get(colIndex, 0) > 1) {
cost /= 2;
}
break;
}
}
}
if (index == null) {
continue;
}
if (i == 0) {
position = 0;
break;
}
}
if (position < 0) {
return;
}
if (position == 0 && firstLeftJoinIndex == 2) {
return;
}
RangeVariable[] newRanges = new RangeVariable[rangeVariables.length];
ArrayUtil.copyArray(rangeVariables, newRanges, rangeVariables.length);
range = newRanges[position];
newRanges[position] = newRanges[0];
newRanges[0] = range;
position = 1;
for (; position < firstLeftJoinIndex; position++) {
boolean found = false;
for (int i = 0; i < joins.size(); i++) {
Expression e = (Expression) joins.get(i);
if (e == null) {
continue;
}
int newPosition = getJoinedRangePosition(e, position,
newRanges);
if (newPosition >= position) {
range = newRanges[position];
newRanges[position] = newRanges[newPosition];
newRanges[newPosition] = range;
joins.set(i, null);
found = true;
break;
}
}
if (found) {
continue;
}
for (int i = 0; i < starts.size(); i++) {
Table table = newRanges[i].rangeTable;
collectIndexableColumns(newRanges[i], starts);
IndexUse[] indexes = table.getIndexForColumns(session,
colIndexSetEqual, OpTypes.EQUAL, false);
if (indexes.length > 0) {
found = true;
break;
}
}
if (!found) {
break;
}
}
if (position != firstLeftJoinIndex) {
return;
}
ArrayUtil.copyArray(newRanges, rangeVariables, rangeVariables.length);
joins.clear();
for (int i = 0; i < firstLeftJoinIndex; i++) {
HsqlArrayList tempJoins = tempJoinExpressions[i];
joins.addAll(tempJoins);
tempJoins.clear();
}
tempJoinExpressions[firstLeftJoinIndex - 1].addAll(joins);
rangeVarSet.clear();
for (int i = 0; i < rangeVariables.length; i++) {
rangeVarSet.add(rangeVariables[i]);
}
}
int getJoinedRangePosition(Expression e, int position,
RangeVariable[] currentRanges) {
int found = -1;
tempSet.clear();
e.getJoinRangeVariables(currentRanges, tempSet);
for (int i = 0; i < tempSet.size(); i++) {
for (int j = 0; j < currentRanges.length; j++) {
if (tempSet.get(i) == currentRanges[j]) {
if (j >= position) {
if (found > 0) {
return -1;
} else {
found = j;
}
}
}
}
}
return found;
}
/**
* Assigns the conditions to separate lists
*/
void assignToLists() {
int lastOuterIndex = -1;
for (int i = 0; i < rangeVariables.length; i++) {
if (rangeVariables[i].isLeftJoin) {
lastOuterIndex = i;
}
if (rangeVariables[i].isRightJoin) {
lastOuterIndex = i;
}
if (lastOuterIndex == i) {
joinExpressions[i].addAll(tempJoinExpressions[i]);
} else {
int start = lastOuterIndex + 1;
for (int j = 0; j < tempJoinExpressions[i].size(); j++) {
Expression e = (Expression) tempJoinExpressions[i].get(j);
assignToJoinLists(e, joinExpressions, start);
}
}
}
for (int i = 0; i < queryConditions.size(); i++) {
assignToJoinLists((Expression) queryConditions.get(i),
whereExpressions, lastRightJoinIndex);
}
}
/**
* Assigns a single condition to the relevant list of conditions
*
* Parameter first indicates the first range variable to which condition
* can be assigned
*/
void assignToJoinLists(Expression e, HsqlList[] expressionLists,
int first) {
if (e == null) {
return;
}
tempSet.clear();
e.collectRangeVariables(rangeVariables, tempSet);
int index = rangeVarSet.getLargestIndex(tempSet);
if (index == -1) {
index = 0;
}
if (index < first) {
index = first;
}
if (e instanceof ExpressionLogical) {
if (((ExpressionLogical) e).isTerminal) {
index = expressionLists.length - 1;
}
}
expressionLists[index].add(e);
}
/**
* Assigns conditions to range variables and converts suitable IN conditions
* to table lookup.
*/
void assignToRangeVariables() {
for (int i = 0; i < rangeVariables.length; i++) {
boolean hasIndex = false;
RangeVariableConditions conditions;
if (i < firstLeftJoinIndex
&& firstRightJoinIndex == rangeVariables.length) {
conditions = rangeVariables[i].joinConditions[0];
joinExpressions[i].addAll(whereExpressions[i]);
assignToRangeVariable(rangeVariables[i], conditions, i,
joinExpressions[i]);
assignToRangeVariable(conditions, joinExpressions[i]);
} else {
conditions = rangeVariables[i].joinConditions[0];
assignToRangeVariable(rangeVariables[i], conditions, i,
joinExpressions[i]);
conditions = rangeVariables[i].joinConditions[0];
if (conditions.hasIndex()) {
hasIndex = true;
}
assignToRangeVariable(conditions, joinExpressions[i]);
conditions = rangeVariables[i].whereConditions[0];
for (int j = i + 1; j < rangeVariables.length; j++) {
if (rangeVariables[j].isRightJoin) {
assignToRangeVariable(
rangeVariables[j].whereConditions[0],
whereExpressions[i]);
}
}
if (!hasIndex) {
assignToRangeVariable(rangeVariables[i], conditions, i,
whereExpressions[i]);
}
assignToRangeVariable(conditions, whereExpressions[i]);
}
}
}
void assignToRangeVariable(RangeVariableConditions conditions,
HsqlList exprList) {
for (int j = 0, size = exprList.size(); j < size; j++) {
Expression e = (Expression) exprList.get(j);
conditions.addCondition(e);
}
}
private void collectIndexableColumns(RangeVariable range,
HsqlList exprList) {
colIndexSetEqual.clear();
colIndexSetOther.clear();
for (int j = 0, size = exprList.size(); j < size; j++) {
Expression e = (Expression) exprList.get(j);
if (!e.isSingleColumnCondition) {
continue;
}
int idx;
if (e.getLeftNode().getRangeVariable() == range) {
idx = e.getLeftNode().getColumnIndex();
} else if (e.getRightNode().getRangeVariable() == range) {
idx = e.getRightNode().getColumnIndex();
} else {
continue;
}
if (e.isSingleColumnEqual) {
colIndexSetEqual.add(idx);
} else {
int count = colIndexSetOther.get(idx, 0);
colIndexSetOther.put(idx, count + 1);
}
}
}
/**
* Assigns a set of conditions to a range variable.
*/
void assignToRangeVariable(RangeVariable rangeVar,
RangeVariableConditions conditions,
int rangeVarIndex, HsqlList exprList) {
if (exprList.isEmpty()) {
return;
}
setIndexConditions(conditions, exprList, rangeVarIndex, true);
}
private void setIndexConditions(RangeVariableConditions conditions,
HsqlList exprList, int rangeVarIndex,
boolean includeOr) {
boolean hasIndex;
colIndexSetEqual.clear();
colIndexSetOther.clear();
for (int j = 0, size = exprList.size(); j < size; j++) {
Expression e = (Expression) exprList.get(j);
if (e == null) {
continue;
}
if (!e.isIndexable(conditions.rangeVar)) {
continue;
}
int type = e.getType();
switch (type) {
case OpTypes.OR : {
continue;
}
case OpTypes.COLUMN : {
continue;
}
case OpTypes.EQUAL : {
if (e.getSubType() == OpTypes.ANY_QUANTIFIED
|| e.getSubType() == OpTypes.ALL_QUANTIFIED) {
continue;
}
if (e.getLeftNode().getRangeVariable()
!= conditions.rangeVar) {
continue;
}
int colIndex = e.getLeftNode().getColumnIndex();
colIndexSetEqual.add(colIndex);
break;
}
case OpTypes.IS_NULL : {
if (e.getLeftNode().getRangeVariable()
!= conditions.rangeVar) {
continue;
}
if (conditions.rangeVar.isLeftJoin) {
continue;
}
int colIndex = e.getLeftNode().getColumnIndex();
colIndexSetEqual.add(colIndex);
break;
}
case OpTypes.NOT : {
if (e.getLeftNode().getLeftNode().getRangeVariable()
!= conditions.rangeVar) {
continue;
}
if (conditions.rangeVar.isLeftJoin) {
continue;
}
int colIndex =
e.getLeftNode().getLeftNode().getColumnIndex();
int count = colIndexSetOther.get(colIndex, 0);
colIndexSetOther.put(colIndex, count + 1);
break;
}
case OpTypes.SMALLER :
case OpTypes.SMALLER_EQUAL :
case OpTypes.GREATER :
case OpTypes.GREATER_EQUAL :
case OpTypes.GREATER_EQUAL_PRE : {
if (e.getLeftNode().getRangeVariable()
!= conditions.rangeVar) {
continue;
}
int colIndex = e.getLeftNode().getColumnIndex();
int count = colIndexSetOther.get(colIndex, 0);
colIndexSetOther.put(colIndex, count + 1);
break;
}
default : {
throw Error.runtimeError(ErrorCode.U_S0500,
"RangeVariableResolver");
}
}
}
setEqualityConditions(conditions, exprList, rangeVarIndex);
hasIndex = conditions.hasIndex();
if (!hasIndex) {
setNonEqualityConditions(conditions, exprList, rangeVarIndex);
hasIndex = conditions.hasIndex();
}
if (rangeVarIndex == 0 && sortAndSlice.usingIndex) {
hasIndex = true;
}
boolean isOR = false;
if (!hasIndex && includeOr) {
for (int j = 0, size = exprList.size(); j < size; j++) {
Expression e = (Expression) exprList.get(j);
if (e == null) {
continue;
}
if (e.getType() == OpTypes.OR) {
hasIndex = setOrConditions(conditions,
(ExpressionLogical) e,
rangeVarIndex);
if (hasIndex) {
exprList.set(j, null);
isOR = true;
break;
}
} else if (e.getType() == OpTypes.EQUAL
&& e.exprSubType == OpTypes.ANY_QUANTIFIED) {
if (rangeVarIndex >= firstLeftJoinIndex
|| firstRightJoinIndex != rangeVariables.length) {
continue;
}
if (e.getRightNode().isCorrelated()) {
continue;
}
OrderedIntHashSet set = new OrderedIntHashSet();
((ExpressionLogical) e).addLeftColumnsForAllAny(
conditions.rangeVar, set);
IndexUse[] indexes =
conditions.rangeVar.rangeTable.getIndexForColumns(
session, set, OpTypes.EQUAL, false);
// code to disable IN optimisation
// index = null;
if (indexes.length != 0
&& inExpressions[rangeVarIndex] == null) {
inExpressions[rangeVarIndex] = e;
inInJoin[rangeVarIndex] = conditions.isJoin;
inExpressionCount++;
exprList.set(j, null);
break;
}
}
}
}
for (int i = 0, size = exprList.size(); i < size; i++) {
Expression e = (Expression) exprList.get(i);
if (e == null) {
continue;
}
if (isOR) {
for (int j = 0; j < conditions.rangeVar.joinConditions.length;
j++) {
if (conditions.isJoin) {
conditions.rangeVar.joinConditions[j]
.nonIndexCondition =
ExpressionLogical
.andExpressions(e, conditions.rangeVar
.joinConditions[j].nonIndexCondition);
} else {
conditions.rangeVar.whereConditions[j]
.nonIndexCondition =
ExpressionLogical
.andExpressions(e, conditions.rangeVar
.whereConditions[j].nonIndexCondition);
}
}
} else {
conditions.addCondition(e);
}
}
}
private boolean setOrConditions(RangeVariableConditions conditions,
ExpressionLogical orExpression,
int rangeVarIndex) {
HsqlArrayList orExprList = new HsqlArrayList();
decomposeOrConditions(orExpression, orExprList);
RangeVariableConditions[] conditionsArray =
new RangeVariableConditions[orExprList.size()];
for (int i = 0; i < orExprList.size(); i++) {
HsqlArrayList exprList = new HsqlArrayList();
Expression e = (Expression) orExprList.get(i);
decomposeAndConditions(session, e, exprList);
RangeVariableConditions c =
new RangeVariableConditions(conditions);
setIndexConditions(c, exprList, rangeVarIndex, false);
conditionsArray[i] = c;
if (!c.hasIndex()) {
// deep OR
return false;
}
}
Expression exclude = null;
for (int i = 0; i < conditionsArray.length; i++) {
RangeVariableConditions c = conditionsArray[i];
conditionsArray[i].excludeConditions = exclude;
if (i == conditionsArray.length - 1) {
break;
}
Expression e = null;
if (c.indexCond != null) {
for (int k = 0; k < c.indexedColumnCount; k++) {
e = ExpressionLogical.andExpressions(e, c.indexCond[k]);
}
}
e = ExpressionLogical.andExpressions(e, c.indexEndCondition);
e = ExpressionLogical.andExpressions(e, c.nonIndexCondition);
exclude = ExpressionLogical.orExpressions(e, exclude);
}
if (exclude != null) {
// return false;
}
if (conditions.isJoin) {
conditions.rangeVar.joinConditions = conditionsArray;
conditionsArray = new RangeVariableConditions[orExprList.size()];
ArrayUtil.fillArray(conditionsArray,
conditions.rangeVar.whereConditions[0]);
conditions.rangeVar.whereConditions = conditionsArray;
} else {
conditions.rangeVar.whereConditions = conditionsArray;
conditionsArray = new RangeVariableConditions[orExprList.size()];
ArrayUtil.fillArray(conditionsArray,
conditions.rangeVar.joinConditions[0]);
conditions.rangeVar.joinConditions = conditionsArray;
}
return true;
}
private void setEqualityConditions(RangeVariableConditions conditions,
HsqlList exprList, int rangeVarIndex) {
Index index = null;
if (rangeVarIndex == 0 && sortAndSlice.usingIndex) {
index = sortAndSlice.primaryTableIndex;
if (index != null) {
conditions.rangeIndex = index;
}
}
if (index == null) {
IndexUse[] indexes =
conditions.rangeVar.rangeTable.getIndexForColumns(session,
colIndexSetEqual, OpTypes.EQUAL, false);
if (indexes.length == 0) {
return;
}
index = indexes[0].index;
double cost = Double.MAX_VALUE;
if (indexes.length > 1) {
for (int i = 0; i < indexes.length; i++) {
PersistentStore store =
conditions.rangeVar.rangeTable.getRowStore(session);
double currentCost =
store.searchCost(session, indexes[i].index,
indexes[i].columnCount,
OpTypes.EQUAL);
if (currentCost < cost) {
cost = currentCost;
index = indexes[i].index;
}
}
}
}
int[] cols = index.getColumns();
int colCount = cols.length;
Expression[] firstRowExpressions = new Expression[cols.length];
for (int j = 0; j < exprList.size(); j++) {
Expression e = (Expression) exprList.get(j);
if (e == null) {
continue;
}
int type = e.getType();
if (type == OpTypes.EQUAL || type == OpTypes.IS_NULL) {
if (e.getLeftNode().getRangeVariable()
!= conditions.rangeVar) {
continue;
}
if (!e.isIndexable(conditions.rangeVar)) {
continue;
}
int offset = ArrayUtil.find(cols,
e.getLeftNode().getColumnIndex());
if (offset != -1 && firstRowExpressions[offset] == null) {
firstRowExpressions[offset] = e;
exprList.set(j, null);
continue;
}
}
}
boolean hasNull = false;
for (int i = 0; i < firstRowExpressions.length; i++) {
Expression e = firstRowExpressions[i];
if (e == null) {
if (colCount == cols.length) {
colCount = i;
}
hasNull = true;
continue;
}
if (hasNull) {
exprList.add(e);
firstRowExpressions[i] = null;
}
}
if (colCount > 0) {
conditions.addIndexCondition(firstRowExpressions, index, colCount);
}
}
private void setNonEqualityConditions(RangeVariableConditions conditions,
HsqlList exprList,
int rangeVarIndex) {
if (colIndexSetOther.isEmpty()) {
return;
}
int currentCount = 0;
Index index = null;
Iterator it;
if (rangeVarIndex == 0 && sortAndSlice.usingIndex) {
index = sortAndSlice.primaryTableIndex;
}
if (index == null) {
it = colIndexSetOther.keySet().iterator();
while (it.hasNext()) {
int colIndex = it.nextInt();
int colCount = colIndexSetOther.get(colIndex, 0);
if (colCount > currentCount) {
Index currentIndex =
conditions.rangeVar.rangeTable.getIndexForColumn(
session, colIndex);
if (currentIndex != null) {
index = currentIndex;
currentCount = colCount;
}
}
}
}
if (index == null) {
return;
}
int[] cols = index.getColumns();
for (int j = 0; j < exprList.size(); j++) {
Expression e = (Expression) exprList.get(j);
if (e == null) {
continue;
}
boolean isIndexed = false;
switch (e.getType()) {
case OpTypes.NOT : {
if (e.getLeftNode().getType() == OpTypes.IS_NULL
&& cols[0]
== e.getLeftNode().getLeftNode()
.getColumnIndex()) {
isIndexed = true;
}
break;
}
case OpTypes.SMALLER :
case OpTypes.SMALLER_EQUAL :
case OpTypes.GREATER :
case OpTypes.GREATER_EQUAL :
case OpTypes.GREATER_EQUAL_PRE : {
if (cols[0] == e.getLeftNode().getColumnIndex()) {
if (e.getRightNode() != null
&& !e.getRightNode().isCorrelated()) {
isIndexed = true;
}
}
break;
}
}
if (isIndexed) {
Expression[] firstRowExpressions =
new Expression[index.getColumnCount()];
firstRowExpressions[0] = e;
conditions.addIndexCondition(firstRowExpressions, index, 1);
exprList.set(j, null);
break;
}
}
}
/**
* Converts an IN conditions into a JOIN
*/
void setInConditionsAsTables() {
for (int i = rangeVariables.length - 1; i >= 0; i--) {
RangeVariable rangeVar = rangeVariables[i];
ExpressionLogical in = (ExpressionLogical) inExpressions[i];
if (in != null) {
OrderedIntHashSet set = new OrderedIntHashSet();
in.addLeftColumnsForAllAny(rangeVar, set);
IndexUse[] indexes =
rangeVar.rangeTable.getIndexForColumns(session, set,
OpTypes.EQUAL, false);
Index index = indexes[0].index;
int indexedColCount = 0;
for (int j = 0; j < index.getColumnCount(); j++) {
if (set.contains(index.getColumns()[j])) {
indexedColCount++;
} else {
break;
}
}
RangeVariable newRangeVar =
new RangeVariable(in.getRightNode().getTable(), null,
null, null, compileContext);
newRangeVar.isGenerated = true;
RangeVariable[] newList =
new RangeVariable[rangeVariables.length + 1];
ArrayUtil.copyAdjustArray(rangeVariables, newList,
newRangeVar, i, 1);
rangeVariables = newList;
// make two columns as arg
Expression[] firstRowExpressions =
new Expression[index.getColumnCount()];
for (int j = 0; j < indexedColCount; j++) {
int leftIndex = index.getColumns()[j];
int rightIndex = set.getIndex(leftIndex);
Expression e = new ExpressionLogical(rangeVar, leftIndex,
newRangeVar,
rightIndex);
firstRowExpressions[j] = e;
}
boolean isOuter = rangeVariables[i].isLeftJoin
|| rangeVariables[i].isRightJoin;
RangeVariableConditions conditions =
!inInJoin[i] && isOuter ? rangeVar.whereConditions[0]
: rangeVar.joinConditions[0];
conditions.addIndexCondition(firstRowExpressions, index,
indexedColCount);
for (int j = 0; j < set.size(); j++) {
int leftIndex = set.get(j);
int rightIndex = j;
Expression e = new ExpressionLogical(rangeVar, leftIndex,
newRangeVar,
rightIndex);
conditions.addCondition(e);
}
}
}
}
private double searchCost(Session session, Table table, Index index,
int count, int opType) {
if (table instanceof TableDerived) {
return 1000;
} else {
return table.getRowStore(session).searchCost(session, index,
count, opType);
}
}
}