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RemoveUnions.java
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52 lines (42 loc) · 1.39 KB
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package sqlancer.transformations;
import java.util.List;
import net.sf.jsqlparser.statement.select.Select;
import net.sf.jsqlparser.statement.select.SelectBody;
import net.sf.jsqlparser.statement.select.SetOperationList;
import net.sf.jsqlparser.util.deparser.ExpressionDeParser;
import net.sf.jsqlparser.util.deparser.SelectDeParser;
/**
* try removing sub selects of a union statement.
*
* e.g. select 1 union select 2 -> select 1
*/
public class RemoveUnions extends JSQLParserBasedTransformation {
private final SelectDeParser remover = new SelectDeParser() {
@Override
public void visit(SetOperationList list) {
List<SelectBody> selectBodyList = list.getSelects();
tryRemoveElms(list, selectBodyList, SetOperationList::setSelects);
super.visit(list);
}
};
public RemoveUnions() {
super("remove union selects");
}
@Override
public boolean init(String sql) {
boolean baseSuc = super.init(sql);
if (!baseSuc) {
return false;
}
this.remover.setExpressionVisitor(new ExpressionDeParser(remover, new StringBuilder()));
return true;
}
@Override
public void apply() {
super.apply();
if (statement instanceof Select) {
Select select = (Select) statement;
select.getSelectBody().accept(remover);
}
}
}