// implement RelOptRule
public void onMatch(RelOptRuleCall call) {
CalcRel calcRel = (CalcRel) call.rels[0];
RexProgram program = calcRel.getProgram();
// check the projection
List<Integer> projOrdinals = new ArrayList<Integer>();
RelDataType outputRowType = isProjectSimple(calcRel, projOrdinals);
if (outputRowType == null) {
return;
}
RexLocalRef condition = program.getCondition();
CompOperatorEnum compOp = CompOperatorEnum.COMP_NOOP;
Integer[] filterOrdinals = {};
List<RexLiteral> filterLiterals = new ArrayList<RexLiteral>();
// check the condition
if (condition != null) {
RexNode filterExprs = program.expandLocalRef(condition);
List<Integer> filterList = new ArrayList<Integer>();
List<CompOperatorEnum> op = new ArrayList<CompOperatorEnum>();
if (!isConditionSimple(calcRel, filterExprs, filterList, filterLiterals, op)) {
return;
}
compOp = op.get(0);
filterOrdinals = filterList.toArray(new Integer[filterList.size()]);
}
RelNode fennelInput =
mergeTraitsAndConvert(
calcRel.getTraits(), FennelRel.FENNEL_EXEC_CONVENTION, calcRel.getChild());
if (fennelInput == null) {
return;
}
Integer[] projection = projOrdinals.toArray(new Integer[projOrdinals.size()]);
FennelReshapeRel reshapeRel =
new FennelReshapeRel(
calcRel.getCluster(),
fennelInput,
projection,
outputRowType,
compOp,
filterOrdinals,
filterLiterals,
new FennelRelParamId[] {},
new Integer[] {},
null);
call.transformTo(reshapeRel);
}
