Examples with EvaluationCalc org.apache.storm.sql.runtime.trident.functions.EvaluationCalc used on opensource projects

Example 1 with EvaluationCalc

use of org.apache.storm.sql.runtime.trident.functions.EvaluationCalc in project storm by apache.

the class TridentCalcRel method tridentPlan.

@Override
public void tridentPlan(TridentPlanCreator planCreator) throws Exception {
    // SingleRel
    RelNode input = getInput();
    StormRelUtils.getStormRelInput(input).tridentPlan(planCreator);
    Stream inputStream = planCreator.pop().toStream();
    String stageName = StormRelUtils.getStageName(this);
    RelDataType inputRowType = getInput(0).getRowType();
    List<String> outputFieldNames = getRowType().getFieldNames();
    int outputCount = outputFieldNames.size();
    // filter
    ExecutableExpression filterInstance = null;
    RexLocalRef condition = program.getCondition();
    if (condition != null) {
        RexNode conditionNode = program.expandLocalRef(condition);
        filterInstance = planCreator.createScalarInstance(Lists.newArrayList(conditionNode), inputRowType, StormRelUtils.getClassName(this));
    }
    // projection
    ExecutableExpression projectionInstance = null;
    List<RexLocalRef> projectList = program.getProjectList();
    if (projectList != null && !projectList.isEmpty()) {
        List<RexNode> expandedNodes = new ArrayList<>();
        for (RexLocalRef project : projectList) {
            expandedNodes.add(program.expandLocalRef(project));
        }
        projectionInstance = planCreator.createScalarInstance(expandedNodes, inputRowType, StormRelUtils.getClassName(this));
    }
    if (projectionInstance == null && filterInstance == null) {
        // it shouldn't be happen
        throw new IllegalStateException("Either projection or condition, or both should be provided.");
    }
    final Stream finalStream = inputStream.flatMap(new EvaluationCalc(filterInstance, projectionInstance, outputCount, planCreator.getDataContext()), new Fields(outputFieldNames)).name(stageName);
    planCreator.addStream(finalStream);
}