Examples with TransformBlockValSet com.linkedin.pinot.core.operator.docvalsets.TransformBlockValSet used on opensource projects

Example 1 with TransformBlockValSet

use of com.linkedin.pinot.core.operator.docvalsets.TransformBlockValSet in project pinot by linkedin.

the class DefaultExpressionEvaluator method evaluateExpression.

/**
   * Helper (recursive) method that walks the expression tree bottom up evaluating
   * transforms at each level.
   *
   * @param projectionBlock Projection block for which to evaluate the expression for
   * @param expressionTree Expression tree to evaluate
   * @return Result of the expression transform
   */
private BlockValSet evaluateExpression(ProjectionBlock projectionBlock, TransformExpressionTree expressionTree) {
    TransformFunction function = getTransformFunction(expressionTree.getTransformName());
    int numDocs = projectionBlock.getNumDocs();
    String expressionString = expressionTree.toString();
    TransformExpressionTree.ExpressionType expressionType = expressionTree.getExpressionType();
    switch(expressionType) {
        case FUNCTION:
            List<TransformExpressionTree> children = expressionTree.getChildren();
            int numChildren = children.size();
            BlockValSet[] transformArgs = new BlockValSet[numChildren];
            for (int i = 0; i < numChildren; i++) {
                transformArgs[i] = evaluateExpression(projectionBlock, children.get(i));
            }
            return new TransformBlockValSet(function, numDocs, transformArgs);
        case IDENTIFIER:
            return projectionBlock.getBlockValueSet(expressionString);
        case LITERAL:
            return new ConstantBlockValSet(expressionString, numDocs);
        default:
            throw new IllegalArgumentException("Illegal expression type in expression evaluator: " + expressionType);
    }
}