Examples of org.lealone.api.AggregateFunction

org.lealone.api.AggregateFunction
A user-defined aggregate function needs to implement this interface. The class must be public and must have a public non-argument constructor.

            int type = expr.getType();
            argTypes[i] = type;
            argSqlTypes[i] = DataType.convertTypeToSQLType(type);
        }
        try {
            AggregateFunction aggregate = getInstance();
            dataType = DataType.convertSQLTypeToValueType(aggregate.getType(argSqlTypes));
        } catch (SQLException e) {
            throw DbException.convert(e);
        }
        return this;
    }

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            e.setEvaluatable(tableFilter, b);
        }
    }


    private AggregateFunction getInstance() throws SQLException {
        AggregateFunction agg = userAggregate.getInstance();
        agg.init(userConnection);
        return agg;
    }

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        HashMap<Expression, Object> group = select.getCurrentGroup();
        if (group == null) {
            throw DbException.get(ErrorCode.INVALID_USE_OF_AGGREGATE_FUNCTION_1, getSQL());
        }
        try {
            AggregateFunction agg = (AggregateFunction) group.get(this);
            if (agg == null) {
                agg = getInstance();
            }
            Object obj = agg.getResult();
            if (obj == null) {
                return ValueNull.INSTANCE;
            }
            return DataType.convertToValue(session, obj, dataType);
        } catch (SQLException e) {

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            // already visited
            return;
        }
        lastGroupRowId = groupRowId;


        AggregateFunction agg = (AggregateFunction) group.get(this);
        try {
            if (agg == null) {
                agg = getInstance();
                group.put(this, agg);
            }
            Object[] argValues = new Object[args.length];
            Object arg = null;
            for (int i = 0, len = args.length; i < len; i++) {
                Value v = args[i].getValue(session);
                v = v.convertTo(argTypes[i]);
                arg = v.getObject();
                argValues[i] = arg;
            }
            if (args.length == 1) {
                agg.add(arg);
            } else {
                agg.add(argValues);
            }
        } catch (SQLException e) {
            throw DbException.convert(e);
        }
    }

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            javaClass = Utils.loadUserClass(className);
        }
        Object obj;
        try {
            obj = javaClass.newInstance();
            AggregateFunction agg = (AggregateFunction) obj;
            return agg;
        } catch (Exception e) {
            throw DbException.convert(e);
        }
    }

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Related Classes of org.lealone.api.AggregateFunction

org.lealone.dbobject.UserAggregate

org.lealone.expression.JavaAggregate

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