Examples with StartsWithExpression org.apache.carbondata.core.scan.expression.conditional.StartsWithExpression used on opensource projects

Example 1 with StartsWithExpression

use of org.apache.carbondata.core.scan.expression.conditional.StartsWithExpression in project carbondata by apache.

the class FilterExpressionProcessor method createFilterResolverTree.

/**
 * Pattern used : Visitor Pattern
 * Method will create filter resolver tree based on the filter expression tree,
 * in this algorithm based on the expression instance the resolvers will created
 *
 * @param expressionTree
 * @param tableIdentifier
 * @return
 */
private FilterResolverIntf createFilterResolverTree(Expression expressionTree, AbsoluteTableIdentifier tableIdentifier) {
    ExpressionType filterExpressionType = expressionTree.getFilterExpressionType();
    BinaryExpression currentExpression = null;
    switch(filterExpressionType) {
        case OR:
        case AND:
            currentExpression = (BinaryExpression) expressionTree;
            return new LogicalFilterResolverImpl(createFilterResolverTree(currentExpression.getLeft(), tableIdentifier), createFilterResolverTree(currentExpression.getRight(), tableIdentifier), currentExpression);
        case RANGE:
            return getFilterResolverBasedOnExpressionType(ExpressionType.RANGE, true, expressionTree, tableIdentifier, expressionTree);
        case EQUALS:
        case IN:
            return getFilterResolverBasedOnExpressionType(ExpressionType.EQUALS, ((BinaryConditionalExpression) expressionTree).isNull, expressionTree, tableIdentifier, expressionTree);
        case GREATERTHAN:
        case GREATERTHAN_EQUALTO:
        case LESSTHAN:
        case LESSTHAN_EQUALTO:
            return getFilterResolverBasedOnExpressionType(ExpressionType.EQUALS, true, expressionTree, tableIdentifier, expressionTree);
        case STARTSWITH:
            assert (expressionTree instanceof StartsWithExpression);
            currentExpression = (StartsWithExpression) expressionTree;
            Expression re = currentExpression.getRight();
            assert (re instanceof LiteralExpression);
            LiteralExpression literal = (LiteralExpression) re;
            String value = literal.getLiteralExpValue().toString();
            Expression left = new GreaterThanEqualToExpression(currentExpression.getLeft(), literal);
            String maxValueLimit = value.substring(0, value.length() - 1) + (char) (((int) value.charAt(value.length() - 1)) + 1);
            Expression right = new LessThanExpression(currentExpression.getLeft(), new LiteralExpression(maxValueLimit, literal.getLiteralExpDataType()));
            currentExpression = new AndExpression(left, right);
            return new LogicalFilterResolverImpl(createFilterResolverTree(currentExpression.getLeft(), tableIdentifier), createFilterResolverTree(currentExpression.getRight(), tableIdentifier), currentExpression);
        case NOT_EQUALS:
        case NOT_IN:
            return getFilterResolverBasedOnExpressionType(ExpressionType.NOT_EQUALS, false, expressionTree, tableIdentifier, expressionTree);
        case FALSE:
            return getFilterResolverBasedOnExpressionType(ExpressionType.FALSE, false, expressionTree, tableIdentifier, expressionTree);
        case TRUE:
            return getFilterResolverBasedOnExpressionType(ExpressionType.TRUE, false, expressionTree, tableIdentifier, expressionTree);
        default:
            return getFilterResolverBasedOnExpressionType(ExpressionType.UNKNOWN, false, expressionTree, tableIdentifier, expressionTree);
    }
}