Examples with UnaryExpression org.apache.pig.Expression.UnaryExpression used on opensource projects

Example 1 with UnaryExpression

use of org.apache.pig.Expression.UnaryExpression in project parquet-mr by apache.

the class ParquetLoader method buildFilter.

private FilterPredicate buildFilter(Expression e) {
    OpType op = e.getOpType();
    if (e instanceof BinaryExpression) {
        Expression lhs = ((BinaryExpression) e).getLhs();
        Expression rhs = ((BinaryExpression) e).getRhs();
        switch(op) {
            case OP_AND:
                return and(buildFilter(lhs), buildFilter(rhs));
            case OP_OR:
                return or(buildFilter(lhs), buildFilter(rhs));
            case OP_BETWEEN:
                BetweenExpression between = (BetweenExpression) rhs;
                return and(buildFilter(OpType.OP_GE, (Column) lhs, (Const) between.getLower()), buildFilter(OpType.OP_LE, (Column) lhs, (Const) between.getUpper()));
            case OP_IN:
                FilterPredicate current = null;
                for (Object value : ((InExpression) rhs).getValues()) {
                    FilterPredicate next = buildFilter(OpType.OP_EQ, (Column) lhs, (Const) value);
                    if (current != null) {
                        current = or(current, next);
                    } else {
                        current = next;
                    }
                }
                return current;
        }
        if (lhs instanceof Column && rhs instanceof Const) {
            return buildFilter(op, (Column) lhs, (Const) rhs);
        } else if (lhs instanceof Const && rhs instanceof Column) {
            return buildFilter(op, (Column) rhs, (Const) lhs);
        }
    } else if (e instanceof UnaryExpression && op == OpType.OP_NOT) {
        return LogicalInverseRewriter.rewrite(not(buildFilter(((UnaryExpression) e).getExpression())));
    }
    throw new RuntimeException("Could not build filter for expression: " + e);
}