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DataFusionJoin.java
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package sqlancer.datafusion.ast;
import java.util.ArrayList;
import java.util.List;
import sqlancer.Randomly;
import sqlancer.common.ast.newast.Join;
import sqlancer.datafusion.DataFusionProvider.DataFusionGlobalState;
import sqlancer.datafusion.DataFusionSchema;
import sqlancer.datafusion.DataFusionSchema.DataFusionColumn;
import sqlancer.datafusion.DataFusionSchema.DataFusionTable;
import sqlancer.datafusion.gen.DataFusionExpressionGenerator;
/*
NOT IMPLEMENTED YET
*/
public class DataFusionJoin
implements DataFusionExpression, Join<DataFusionExpression, DataFusionTable, DataFusionColumn> {
private final DataFusionTableReference leftTable;
private final DataFusionTableReference rightTable;
private final JoinType joinType;
private DataFusionExpression onCondition;
public DataFusionJoin(DataFusionTableReference leftTable, DataFusionTableReference rightTable, JoinType joinType,
DataFusionExpression whereCondition) {
this.leftTable = leftTable;
this.rightTable = rightTable;
this.joinType = joinType;
this.onCondition = whereCondition;
}
public static List<DataFusionJoin> getJoins(List<DataFusionTableReference> tableList,
DataFusionGlobalState globalState) {
// [t1_join_t2, t1_join_t3, ...]
List<DataFusionJoin> joinExpressions = new ArrayList<>();
while (tableList.size() >= 2 && Randomly.getBooleanWithRatherLowProbability()) {
DataFusionTableReference leftTable = tableList.remove(0);
DataFusionTableReference rightTable = tableList.remove(0);
List<DataFusionColumn> columns = new ArrayList<>(leftTable.getTable().getColumns());
columns.addAll(rightTable.getTable().getColumns());
// TODO(datafusion) this `joinGen` can generate super chaotic exprsions, maybe we should make it more like a
// normal join expression
DataFusionExpressionGenerator joinGen = new DataFusionExpressionGenerator(globalState).setColumns(columns);
switch (DataFusionJoin.JoinType.getRandom()) {
case INNER:
joinExpressions.add(DataFusionJoin.createInnerJoin(leftTable, rightTable,
joinGen.generateExpression(DataFusionSchema.DataFusionDataType.BOOLEAN)));
break;
default:
throw new AssertionError();
}
}
return joinExpressions;
}
public static DataFusionJoin createInnerJoin(DataFusionTableReference left, DataFusionTableReference right,
DataFusionExpression predicate) {
return new DataFusionJoin(left, right, JoinType.INNER, predicate);
}
public DataFusionTableReference getLeftTable() {
return leftTable;
}
public DataFusionTableReference getRightTable() {
return rightTable;
}
public JoinType getJoinType() {
return joinType;
}
public DataFusionExpression getOnCondition() {
return onCondition;
}
public enum JoinType {
INNER;
// NATURAL, LEFT, RIGHT;
public static JoinType getRandom() {
return Randomly.fromOptions(values());
}
}
@Override
public void setOnClause(DataFusionExpression onClause) {
onCondition = onClause;
}
}