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org.h2.expression.condition.ConditionInQuery Maven / Gradle / Ivy
/*
* Copyright 2004-2022 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression.condition;
import org.h2.command.query.Query;
import org.h2.engine.SessionLocal;
import org.h2.expression.Expression;
import org.h2.expression.ExpressionColumn;
import org.h2.expression.ExpressionVisitor;
import org.h2.index.IndexCondition;
import org.h2.result.LocalResult;
import org.h2.result.ResultInterface;
import org.h2.table.ColumnResolver;
import org.h2.table.TableFilter;
import org.h2.value.DataType;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
import org.h2.value.ValueBoolean;
import org.h2.value.ValueNull;
import org.h2.value.ValueRow;
/**
* An IN() condition with a subquery, as in WHERE ID IN(SELECT ...)
*/
public final class ConditionInQuery extends PredicateWithSubquery {
private Expression left;
private final boolean not;
private final boolean whenOperand;
private final boolean all;
private final int compareType;
public ConditionInQuery(Expression left, boolean not, boolean whenOperand, Query query, boolean all,
int compareType) {
super(query);
this.left = left;
this.not = not;
this.whenOperand = whenOperand;
/*
* Need to do it now because other methods may be invoked in different
* order.
*/
query.setRandomAccessResult(true);
query.setNeverLazy(true);
query.setDistinctIfPossible();
this.all = all;
this.compareType = compareType;
}
@Override
public Value getValue(SessionLocal session) {
return getValue(session, left.getValue(session));
}
@Override
public boolean getWhenValue(SessionLocal session, Value left) {
if (!whenOperand) {
return super.getWhenValue(session, left);
}
return getValue(session, left).isTrue();
}
private Value getValue(SessionLocal session, Value left) {
query.setSession(session);
LocalResult rows = (LocalResult) query.query(0);
if (!rows.hasNext()) {
return ValueBoolean.get(not ^ all);
}
if ((compareType & ~1) == Comparison.EQUAL_NULL_SAFE) {
return getNullSafeValueSlow(session, rows, left);
}
if (left.containsNull()) {
return ValueNull.INSTANCE;
}
if (all || compareType != Comparison.EQUAL || !session.getDatabase().getSettings().optimizeInSelect) {
return getValueSlow(session, rows, left);
}
int columnCount = query.getColumnCount();
if (columnCount != 1) {
Value[] leftValue = left.convertToAnyRow().getList();
if (columnCount == leftValue.length && rows.containsDistinct(leftValue)) {
return ValueBoolean.get(!not);
}
} else {
TypeInfo colType = rows.getColumnType(0);
if (colType.getValueType() == Value.NULL) {
return ValueNull.INSTANCE;
}
if (left.getValueType() == Value.ROW) {
left = ((ValueRow) left).getList()[0];
}
if (rows.containsDistinct(new Value[] { left })) {
return ValueBoolean.get(!not);
}
}
if (rows.containsNull()) {
return ValueNull.INSTANCE;
}
return ValueBoolean.get(not);
}
private Value getValueSlow(SessionLocal session, ResultInterface rows, Value l) {
// this only returns the correct result if the result has at least one
// row, and if l is not null
boolean simple = l.getValueType() != Value.ROW && query.getColumnCount() == 1;
boolean hasNull = false;
ValueBoolean searched = ValueBoolean.get(!all);
while (rows.next()) {
Value[] currentRow = rows.currentRow();
Value cmp = Comparison.compare(session, l, simple ? currentRow[0] : ValueRow.get(currentRow),
compareType);
if (cmp == ValueNull.INSTANCE) {
hasNull = true;
} else if (cmp == searched) {
return ValueBoolean.get(not == all);
}
}
if (hasNull) {
return ValueNull.INSTANCE;
}
return ValueBoolean.get(not ^ all);
}
private Value getNullSafeValueSlow(SessionLocal session, ResultInterface rows, Value l) {
boolean simple = l.getValueType() != Value.ROW && query.getColumnCount() == 1;
boolean searched = all == (compareType == Comparison.NOT_EQUAL_NULL_SAFE);
while (rows.next()) {
Value[] currentRow = rows.currentRow();
if (session.areEqual(l, simple ? currentRow[0] : ValueRow.get(currentRow)) == searched) {
return ValueBoolean.get(not == all);
}
}
return ValueBoolean.get(not ^ all);
}
@Override
public boolean isWhenConditionOperand() {
return whenOperand;
}
@Override
public Expression getNotIfPossible(SessionLocal session) {
if (whenOperand) {
return null;
}
return new ConditionInQuery(left, !not, false, query, all, compareType);
}
@Override
public void mapColumns(ColumnResolver resolver, int level, int state) {
left.mapColumns(resolver, level, state);
super.mapColumns(resolver, level, state);
}
@Override
public Expression optimize(SessionLocal session) {
super.optimize(session);
left = left.optimize(session);
TypeInfo.checkComparable(left.getType(), query.getRowDataType());
return this;
}
@Override
public void setEvaluatable(TableFilter tableFilter, boolean b) {
left.setEvaluatable(tableFilter, b);
super.setEvaluatable(tableFilter, b);
}
@Override
public boolean needParentheses() {
return true;
}
@Override
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags) {
boolean outerNot = not && (all || compareType != Comparison.EQUAL);
if (outerNot) {
builder.append("NOT (");
}
left.getSQL(builder, sqlFlags, AUTO_PARENTHESES);
getWhenSQL(builder, sqlFlags);
if (outerNot) {
builder.append(')');
}
return builder;
}
@Override
public StringBuilder getWhenSQL(StringBuilder builder, int sqlFlags) {
if (all) {
builder.append(Comparison.COMPARE_TYPES[compareType]).append(" ALL");
} else if (compareType == Comparison.EQUAL) {
if (not) {
builder.append(" NOT");
}
builder.append(" IN");
} else {
builder.append(' ').append(Comparison.COMPARE_TYPES[compareType]).append(" ANY");
}
return super.getUnenclosedSQL(builder, sqlFlags);
}
@Override
public void updateAggregate(SessionLocal session, int stage) {
left.updateAggregate(session, stage);
super.updateAggregate(session, stage);
}
@Override
public boolean isEverything(ExpressionVisitor visitor) {
return left.isEverything(visitor) && super.isEverything(visitor);
}
@Override
public int getCost() {
return left.getCost() + super.getCost();
}
@Override
public void createIndexConditions(SessionLocal session, TableFilter filter) {
if (!session.getDatabase().getSettings().optimizeInList) {
return;
}
if (not || compareType != Comparison.EQUAL) {
return;
}
if (query.getColumnCount() != 1) {
return;
}
if (!(left instanceof ExpressionColumn)) {
return;
}
TypeInfo colType = left.getType();
TypeInfo queryType = query.getExpressions().get(0).getType();
if (!TypeInfo.haveSameOrdering(colType, TypeInfo.getHigherType(colType, queryType))) {
return;
}
int leftType = colType.getValueType();
if (!DataType.hasTotalOrdering(leftType) && leftType != queryType.getValueType()) {
return;
}
ExpressionColumn l = (ExpressionColumn) left;
if (filter != l.getTableFilter()) {
return;
}
ExpressionVisitor visitor = ExpressionVisitor.getNotFromResolverVisitor(filter);
if (!query.isEverything(visitor)) {
return;
}
filter.addIndexCondition(IndexCondition.getInQuery(l, query));
}
}
