Examples of com.odiago.flumebase.plan.ProjectionNode

com.odiago.flumebase.plan.ProjectionNode
Node that projects from an input schema onto an output set of fields. The input schema is not explicitly specified; it is inferred from the flow.

    // Evaluate calculated-expression fields.
    addExpressionsToPlan(flowSpec, exprPropagateFields, projectionInputs);


    // Create the projected schema based on the symbol table returned by our source. 
    Schema projectedSchema = createFieldSchema(distinctFields(projectionOutputs));
    ProjectionNode projectionNode = new ProjectionNode(projectionInputs, projectionOutputs);
    projectionNode.setAttr(PlanNode.OUTPUT_SCHEMA_ATTR, projectedSchema);
    flowSpec.attachToLastLayer(projectionNode);


    if (mHaving != null) {
      // Non-null HAVING conditions; apply another filter to our output.
      PlanNode havingNode = new FilterNode(mHaving);

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      SymbolTable inTable = planContext.getSymbolTable();
      SymbolTable outTable = new HashSymbolTable(inTable);
      outputFields = distinctFields(outputFields);
      outTable.addAll(mFieldSymbols);
      Schema outputSchema = createFieldSchema(outputFields);
      ProjectionNode cleanupProjection = new ProjectionNode(outputFields, outputFields);
      cleanupProjection.setAttr(PlanNode.OUTPUT_SCHEMA_ATTR, outputSchema);
      flowSpec.attachToLastLayer(cleanupProjection);


      outContext.setSymbolTable(outTable);
      outContext.setSchema(outputSchema);
      outContext.setOutFields(outputFields);

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    } else if (node instanceof FilterNode) {
      FilterNode filterNode = (FilterNode) node;
      Expr filterExpr = filterNode.getFilterExpr();
      newElem = new FilterElement(newContext, filterExpr);
    } else if (node instanceof ProjectionNode) {
      ProjectionNode projNode = (ProjectionNode) node;
      Schema outSchema = (Schema) projNode.getAttr(PlanNode.OUTPUT_SCHEMA_ATTR);
      newElem = new ProjectionElement(newContext, outSchema, projNode.getInputFields(),
          projNode.getOutputFields());
    } else if (node instanceof AggregateNode) {
      AggregateNode aggNode = (AggregateNode) node;
      newElem = new BucketedAggregationElement(newContext, aggNode);
    } else if (node instanceof EvaluateExprsNode) {
      EvaluateExprsNode evalNode = (EvaluateExprsNode) node;

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Related Classes of com.odiago.flumebase.plan.ProjectionNode

com.odiago.flumebase.exec.local.LocalFlowBuilder

com.odiago.flumebase.parser.SelectStmt

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