protected DrillRel addRenamedProject(DrillRel rel, RelDataType validatedRowType) {
RelDataType t = rel.getRowType();
RexBuilder b = rel.getCluster().getRexBuilder();
List<RexNode> projections = Lists.newArrayList();
int projectCount = t.getFieldList().size();
for (int i = 0; i < projectCount; i++) {
projections.add(b.makeInputRef(rel, i));
}
final List<String> fieldNames2 =
SqlValidatorUtil.uniquify(validatedRowType.getFieldNames(), SqlValidatorUtil.F_SUGGESTER2);
RelDataType newRowType =
RexUtil.createStructType(rel.getCluster().getTypeFactory(), projections, fieldNames2);
DrillProjectRel topProj =
DrillProjectRel.create(rel.getCluster(), rel.getTraitSet(), rel, projections, newRowType);
// Add a final non-trivial Project to get the validatedRowType, if child is not project.
if (rel instanceof Project && DrillRelOptUtil.isTrivialProject(topProj, true)) {
return rel;
} else {
return topProj;
}
}
/**
* Push any equi join conditions that are not column references as Projections on top of the
* children.
*
* @param factory Project factory to use.
* @param inputRels inputs to a join
* @param leftJoinKeys expressions for LHS of join key
* @param rightJoinKeys expressions for RHS of join key
* @param systemColCount number of system columns, usually zero. These columns are projected at
* the leading edge of the output row.
* @param leftKeys on return this contains the join key positions from the new project rel on the
* LHS.
* @param rightKeys on return this contains the join key positions from the new project rel on the
* RHS.
* @return the join condition after the equi expressions pushed down.
*/
public static RexNode projectNonColumnEquiConditions(
ProjectFactory factory,
RelNode[] inputRels,
List<RexNode> leftJoinKeys,
List<RexNode> rightJoinKeys,
int systemColCount,
List<Integer> leftKeys,
List<Integer> rightKeys) {
RelNode leftRel = inputRels[0];
RelNode rightRel = inputRels[1];
RexBuilder rexBuilder = leftRel.getCluster().getRexBuilder();
RexNode outJoinCond = null;
int origLeftInputSize = leftRel.getRowType().getFieldCount();
int origRightInputSize = rightRel.getRowType().getFieldCount();
List<RexNode> newLeftFields = new ArrayList<RexNode>();
List<String> newLeftFieldNames = new ArrayList<String>();
List<RexNode> newRightFields = new ArrayList<RexNode>();
List<String> newRightFieldNames = new ArrayList<String>();
int leftKeyCount = leftJoinKeys.size();
int i;
for (i = 0; i < origLeftInputSize; i++) {
final RelDataTypeField field = leftRel.getRowType().getFieldList().get(i);
newLeftFields.add(rexBuilder.makeInputRef(field.getType(), i));
newLeftFieldNames.add(field.getName());
}
for (i = 0; i < origRightInputSize; i++) {
final RelDataTypeField field = rightRel.getRowType().getFieldList().get(i);
newRightFields.add(rexBuilder.makeInputRef(field.getType(), i));
newRightFieldNames.add(field.getName());
}
int newKeyCount = 0;
List<Pair<Integer, Integer>> origColEqConds = new ArrayList<Pair<Integer, Integer>>();
for (i = 0; i < leftKeyCount; i++) {
RexNode leftKey = leftJoinKeys.get(i);
RexNode rightKey = rightJoinKeys.get(i);
if (leftKey instanceof RexInputRef && rightKey instanceof RexInputRef) {
origColEqConds.add(
Pair.of(((RexInputRef) leftKey).getIndex(), ((RexInputRef) rightKey).getIndex()));
} else {
newLeftFields.add(leftKey);
newLeftFieldNames.add(null);
newRightFields.add(rightKey);
newRightFieldNames.add(null);
newKeyCount++;
}
}
for (i = 0; i < origColEqConds.size(); i++) {
Pair<Integer, Integer> p = origColEqConds.get(i);
RexNode leftKey = leftJoinKeys.get(i);
RexNode rightKey = rightJoinKeys.get(i);
leftKeys.add(p.left);
rightKeys.add(p.right);
RexNode cond =
rexBuilder.makeCall(
SqlStdOperatorTable.EQUALS,
rexBuilder.makeInputRef(leftKey.getType(), systemColCount + p.left),
rexBuilder.makeInputRef(
rightKey.getType(), systemColCount + origLeftInputSize + newKeyCount + p.right));
if (outJoinCond == null) {
outJoinCond = cond;
} else {
outJoinCond = rexBuilder.makeCall(SqlStdOperatorTable.AND, outJoinCond, cond);
}
}
if (newKeyCount == 0) {
return outJoinCond;
}
int newLeftOffset = systemColCount + origLeftInputSize;
int newRightOffset = systemColCount + origLeftInputSize + origRightInputSize + newKeyCount;
for (i = 0; i < newKeyCount; i++) {
leftKeys.add(origLeftInputSize + i);
rightKeys.add(origRightInputSize + i);
RexNode cond =
rexBuilder.makeCall(
SqlStdOperatorTable.EQUALS,
rexBuilder.makeInputRef(
newLeftFields.get(origLeftInputSize + i).getType(), newLeftOffset + i),
rexBuilder.makeInputRef(
newRightFields.get(origRightInputSize + i).getType(), newRightOffset + i));
if (outJoinCond == null) {
outJoinCond = cond;
} else {
outJoinCond = rexBuilder.makeCall(SqlStdOperatorTable.AND, outJoinCond, cond);
}
}
// added project if need to produce new keys than the original input
// fields
if (newKeyCount > 0) {
leftRel =
factory.createProject(
leftRel, newLeftFields, SqlValidatorUtil.uniquify(newLeftFieldNames));
rightRel =
factory.createProject(
rightRel, newRightFields, SqlValidatorUtil.uniquify(newRightFieldNames));
}
inputRels[0] = leftRel;
inputRels[1] = rightRel;
return outJoinCond;
}