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H2RandomQuerySynthesizer.java
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60 lines (53 loc) · 2.31 KB
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package sqlancer.h2;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import sqlancer.Randomly;
import sqlancer.h2.H2Provider.H2GlobalState;
import sqlancer.h2.H2Schema.H2Table;
import sqlancer.h2.H2Schema.H2Tables;
import sqlancer.h2.ast.H2Constant;
import sqlancer.h2.ast.H2Expression;
import sqlancer.h2.ast.H2Join;
import sqlancer.h2.ast.H2Select;
import sqlancer.h2.ast.H2TableReference;
public final class H2RandomQuerySynthesizer {
private H2RandomQuerySynthesizer() {
}
public static H2Select generateSelect(H2GlobalState globalState, int nrColumns) {
H2Tables targetTables = globalState.getSchema().getRandomTableNonEmptyTables();
H2ExpressionGenerator gen = new H2ExpressionGenerator(globalState).setColumns(targetTables.getColumns());
H2Select select = new H2Select();
List<H2Expression> columns = new ArrayList<>();
for (int i = 0; i < nrColumns; i++) {
H2Expression expression = gen.generateExpression();
columns.add(expression);
}
select.setFetchColumns(columns);
List<H2Table> tables = targetTables.getTables();
List<H2TableReference> tableList = tables.stream().map(t -> new H2TableReference(t))
.collect(Collectors.toList());
List<H2Join> joins = H2Join.getJoins(tableList, globalState);
select.setJoinList(joins.stream().collect(Collectors.toList()));
select.setFromList(tableList.stream().collect(Collectors.toList()));
if (Randomly.getBoolean()) {
select.setWhereClause(gen.generateExpression());
}
if (Randomly.getBoolean()) {
select.setOrderByClauses(gen.generateOrderBys());
}
if (Randomly.getBoolean()) {
select.setGroupByExpressions(gen.generateExpressions(Randomly.smallNumber() + 1));
}
if (Randomly.getBoolean()) {
select.setLimitClause(H2Constant.createIntConstant(Randomly.getNotCachedInteger(0, Integer.MAX_VALUE)));
}
if (Randomly.getBoolean()) {
select.setOffsetClause(H2Constant.createIntConstant(Randomly.getNotCachedInteger(0, Integer.MAX_VALUE)));
}
if (Randomly.getBoolean()) {
select.setHavingClause(gen.generateHavingClause());
}
return select;
}
}