Examples with SelectExpressionItem net.sf.jsqlparser.statement.select.SelectExpressionItem used on opensource projects

Example 1 with SelectExpressionItem

use of net.sf.jsqlparser.statement.select.SelectExpressionItem in project dbeaver by serge-rider.

the class SQLQueryTransformerCount method transformQuery.

@Override
public SQLQuery transformQuery(SQLDataSource dataSource, SQLQuery query) throws DBException {
    try {
        Statement statement = CCJSqlParserUtil.parse(query.getQuery());
        if (statement instanceof Select && ((Select) statement).getSelectBody() instanceof PlainSelect) {
            PlainSelect select = (PlainSelect) ((Select) statement).getSelectBody();
            List<SelectItem> selectItems = new ArrayList<>();
            Function countFunc = new Function();
            countFunc.setName("count");
            countFunc.setParameters(new ExpressionList(Collections.<Expression>singletonList(new Column("*"))));
            SelectItem countItem = new SelectExpressionItem(countFunc);
            selectItems.add(countItem);
            select.setSelectItems(selectItems);
            return new SQLQuery(dataSource, select.toString(), query, false);
        } else {
            throw new DBException("Query [" + query.getQuery() + "] can't be modified");
        }
    } catch (JSQLParserException e) {
        throw new DBException("Can't transform query to SELECT count(*)", e);
    }
}

Example 2 with SelectExpressionItem

use of net.sf.jsqlparser.statement.select.SelectExpressionItem in project herddb by diennea.

the class SQLAggregator method createOutputColumns.

private static Column[] createOutputColumns(List<SelectItem> selectItems, DataScanner wrapped) throws StatementExecutionException {
    Column[] columns = new Column[selectItems.size()];
    int i = 0;
    for (SelectItem item : selectItems) {
        boolean done = false;
        if (item instanceof SelectExpressionItem) {
            SelectExpressionItem sei = (SelectExpressionItem) item;
            Expression expression = sei.getExpression();
            if (expression instanceof Function) {
                Function f = (Function) expression;
                String fieldName = f.toString();
                if (sei.getAlias() != null && sei.getAlias().getName() != null) {
                    fieldName = sei.getAlias().getName();
                }
                if (fieldName == null) {
                    fieldName = "field" + i;
                }
                Column aggregated = BuiltinFunctions.toAggregatedOutputColumn(fieldName, f);
                if (aggregated != null) {
                    columns[i] = aggregated;
                    done = true;
                }
            } else if (expression instanceof net.sf.jsqlparser.schema.Column) {
                net.sf.jsqlparser.schema.Column c = (net.sf.jsqlparser.schema.Column) expression;
                String name = c.getColumnName();
                boolean found = false;
                for (Column co : wrapped.getSchema()) {
                    if (co.name.equals(name)) {
                        columns[i] = co;
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    throw new StatementExecutionException("cannot find column " + name + " is upstream scanner");
                }
                done = true;
            } else {
                throw new StatementExecutionException("unhandled aggregate query selectable item:" + expression);
            }
        }
        i++;
        if (!done) {
            throw new StatementExecutionException("unhandled aggregate function " + item);
        }
    }
    return columns;
}

Example 3 with SelectExpressionItem

use of net.sf.jsqlparser.statement.select.SelectExpressionItem in project herddb by diennea.

the class SQLPlanner method buildSelectStatement.

private ExecutionPlan buildSelectStatement(String defaultTableSpace, Select s, boolean scan, int maxRows) throws StatementExecutionException {
    PlainSelect selectBody = (PlainSelect) s.getSelectBody();
    net.sf.jsqlparser.schema.Table fromTable = (net.sf.jsqlparser.schema.Table) selectBody.getFromItem();
    TableRef mainTable = TableRef.buildFrom(fromTable, defaultTableSpace);
    String mainTableAlias = mainTable.tableAlias;
    String tableSpace = mainTable.tableSpace;
    TableSpaceManager tableSpaceManager = manager.getTableSpaceManager(tableSpace);
    if (tableSpaceManager == null) {
        throw new TableSpaceDoesNotExistException("no such tablespace " + tableSpace + " here at " + manager.getNodeId());
    }
    AbstractTableManager tableManager = tableSpaceManager.getTableManager(mainTable.tableName);
    if (tableManager == null) {
        throw new TableDoesNotExistException("no such table " + mainTable.tableName + " in tablespace " + tableSpace);
    }
    // linked hash map retains the order of insertions
    LinkedHashMap<String, JoinSupport> joins = new LinkedHashMap<>();
    boolean joinPresent = false;
    joins.put(mainTable.tableAlias, new JoinSupport(mainTable, tableManager));
    if (selectBody.getJoins() != null) {
        for (Join join : selectBody.getJoins()) {
            joinPresent = true;
            if (join.isLeft() || join.isCross() || join.isRight() || join.isOuter() || join.isSimple()) {
                throw new StatementExecutionException("unsupported JOIN type: " + join);
            }
            net.sf.jsqlparser.schema.Table joinedTable = (net.sf.jsqlparser.schema.Table) join.getRightItem();
            TableRef joinedTableRef = TableRef.buildFrom(joinedTable, defaultTableSpace);
            if (!joinedTableRef.tableSpace.equalsIgnoreCase(mainTable.tableSpace)) {
                throw new TableDoesNotExistException("unsupported cross-tablespace JOIN " + "between" + mainTable.tableSpace + "." + mainTable.tableName + " and " + joinedTableRef.tableSpace + "." + joinedTableRef.tableName);
            }
            AbstractTableManager joinedTableManager = tableSpaceManager.getTableManager(joinedTableRef.tableName);
            if (joinedTableManager == null) {
                throw new TableDoesNotExistException("no such table " + joinedTableRef.tableName + " in tablespace " + tableSpace);
            }
            JoinSupport joinSupport = new JoinSupport(joinedTableRef, joinedTableManager);
            joins.put(joinedTableRef.tableAlias, joinSupport);
        }
    }
    Projection mainTableProjection;
    Table table = tableManager.getTable();
    boolean allColumns = false;
    boolean containsAggregateFunctions = false;
    for (SelectItem c : selectBody.getSelectItems()) {
        if (c instanceof AllColumns) {
            allColumns = true;
            break;
        } else if (c instanceof AllTableColumns) {
            AllTableColumns allTableColumns = (AllTableColumns) c;
            TableRef ref = TableRef.buildFrom(allTableColumns.getTable(), defaultTableSpace);
            if (!joinPresent && ref.tableAlias.equals(mainTable.tableAlias)) {
                // select a.*  FROM table a
                allColumns = true;
            } else {
                // select a.*, b.* FROM table a JOIN table b
                joins.get(ref.tableAlias).allColumns = true;
            }
        } else if (c instanceof SelectExpressionItem) {
            SelectExpressionItem se = (SelectExpressionItem) c;
            if (isAggregateFunction(se.getExpression())) {
                containsAggregateFunctions = true;
            }
            if (!joinPresent) {
                joins.get(mainTable.tableAlias).selectItems.add(c);
            } else {
                ColumnReferencesDiscovery discoverMainTableAlias = discoverMainTableAlias(se.getExpression());
                String mainTableAliasForItem = discoverMainTableAlias.getMainTableAlias();
                if (discoverMainTableAlias.isContainsMixedAliases()) {
                    throw new StatementExecutionException("unsupported single SELECT ITEM with mixed aliases: " + c);
                }
                if (mainTableAliasForItem == null) {
                    mainTableAliasForItem = mainTable.tableAlias;
                }
                joins.get(mainTableAliasForItem).selectItems.add(c);
            }
        } else {
            throw new StatementExecutionException("unsupported SELECT ITEM type: " + c);
        }
    }
    if (allColumns) {
        mainTableProjection = Projection.IDENTITY(table.columnNames, table.columns);
        for (Map.Entry<String, JoinSupport> join : joins.entrySet()) {
            JoinSupport support = join.getValue();
            support.projection = Projection.IDENTITY(support.table.columnNames, support.table.columns);
            support.allColumns = true;
        }
    } else {
        if (!joinPresent) {
            mainTableProjection = new SQLProjection(table, mainTableAlias, selectBody.getSelectItems());
        } else {
            for (JoinSupport support : joins.values()) {
                if (support.allColumns) {
                    support.projection = Projection.IDENTITY(support.table.columnNames, support.table.columns);
                } else {
                    support.projection = new SQLProjection(support.table, support.tableRef.tableAlias, support.selectItems);
                }
            }
            mainTableProjection = joins.get(mainTableAlias).projection;
        }
    }
    if (scan) {
        if (!joinPresent) {
            SQLRecordPredicate where = selectBody.getWhere() != null ? new SQLRecordPredicate(table, mainTableAlias, selectBody.getWhere()) : null;
            if (where != null) {
                discoverIndexOperations(selectBody.getWhere(), table, mainTableAlias, where, tableSpaceManager);
            }
            Aggregator aggregator = null;
            ScanLimitsImpl scanLimits = null;
            if (containsAggregateFunctions || (selectBody.getGroupByColumnReferences() != null && !selectBody.getGroupByColumnReferences().isEmpty())) {
                aggregator = new SQLAggregator(selectBody.getSelectItems(), selectBody.getGroupByColumnReferences(), manager.getRecordSetFactory());
            }
            TupleComparator comparatorOnScan = null;
            TupleComparator comparatorOnPlan = null;
            if (selectBody.getOrderByElements() != null && !selectBody.getOrderByElements().isEmpty()) {
                if (aggregator != null) {
                    comparatorOnPlan = SingleColumnSQLTupleComparator.make(mainTableAlias, selectBody.getOrderByElements(), null);
                } else {
                    comparatorOnScan = SingleColumnSQLTupleComparator.make(mainTableAlias, selectBody.getOrderByElements(), table.primaryKey);
                }
            }
            Limit limit = selectBody.getLimit();
            Top top = selectBody.getTop();
            if (limit != null && top != null) {
                throw new StatementExecutionException("LIMIT and TOP cannot be used on the same query");
            }
            if (limit != null) {
                if (limit.isLimitAll() || limit.isLimitNull() || limit.getOffset() instanceof JdbcParameter) {
                    throw new StatementExecutionException("Invalid LIMIT clause (limit=" + limit + ")");
                }
                if (maxRows > 0 && limit.getRowCount() instanceof JdbcParameter) {
                    throw new StatementExecutionException("Invalid LIMIT clause (limit=" + limit + ") and JDBC setMaxRows=" + maxRows);
                }
                int rowCount;
                int rowCountJdbcParameter = -1;
                if (limit.getRowCount() instanceof JdbcParameter) {
                    rowCount = -1;
                    rowCountJdbcParameter = ((JdbcParameter) limit.getRowCount()).getIndex() - 1;
                } else {
                    rowCount = ((Number) resolveValue(limit.getRowCount(), false)).intValue();
                }
                int offset = limit.getOffset() != null ? ((Number) resolveValue(limit.getOffset(), false)).intValue() : 0;
                scanLimits = new ScanLimitsImpl(rowCount, offset, rowCountJdbcParameter + 1);
            } else if (top != null) {
                if (top.isPercentage() || top.getExpression() == null) {
                    throw new StatementExecutionException("Invalid TOP clause (top=" + top + ")");
                }
                try {
                    int rowCount = Integer.parseInt(resolveValue(top.getExpression(), false) + "");
                    scanLimits = new ScanLimitsImpl(rowCount, 0);
                } catch (NumberFormatException error) {
                    throw new StatementExecutionException("Invalid TOP clause: " + error, error);
                }
            }
            if (maxRows > 0) {
                if (scanLimits == null) {
                    scanLimits = new ScanLimitsImpl(maxRows, 0);
                } else if (scanLimits.getMaxRows() <= 0 || scanLimits.getMaxRows() > maxRows) {
                    scanLimits = new ScanLimitsImpl(maxRows, scanLimits.getOffset());
                }
            }
            ScanLimitsImpl limitsOnScan = null;
            ScanLimitsImpl limitsOnPlan = null;
            if (aggregator != null) {
                limitsOnPlan = scanLimits;
            } else {
                limitsOnScan = scanLimits;
            }
            try {
                ScanStatement statement = new ScanStatement(tableSpace, mainTable.tableName, mainTableProjection, where, comparatorOnScan, limitsOnScan);
                return ExecutionPlan.make(statement, aggregator, limitsOnPlan, comparatorOnPlan);
            } catch (IllegalArgumentException err) {
                throw new StatementExecutionException(err);
            }
        } else {
            if (containsAggregateFunctions || (selectBody.getGroupByColumnReferences() != null && !selectBody.getGroupByColumnReferences().isEmpty())) {
                throw new StatementExecutionException("AGGREGATEs are not yet supported with JOIN");
            }
            Limit limit = selectBody.getLimit();
            Top top = selectBody.getTop();
            if (limit != null && top != null) {
                throw new StatementExecutionException("LIMIT and TOP cannot be used on the same query");
            }
            ScanLimitsImpl scanLimits = null;
            if (limit != null) {
                if (limit.isLimitAll() || limit.isLimitNull() || limit.getOffset() instanceof JdbcParameter) {
                    throw new StatementExecutionException("Invalid LIMIT clause (limit=" + limit + ")");
                }
                if (maxRows > 0 && limit.getRowCount() instanceof JdbcParameter) {
                    throw new StatementExecutionException("Invalid LIMIT clause (limit=" + limit + ") and JDBC setMaxRows=" + maxRows);
                }
                int rowCount;
                int rowCountJdbcParameter = -1;
                if (limit.getRowCount() instanceof JdbcParameter) {
                    rowCount = -1;
                    rowCountJdbcParameter = ((JdbcParameter) limit.getRowCount()).getIndex() - 1;
                } else {
                    rowCount = ((Number) resolveValue(limit.getRowCount(), false)).intValue();
                }
                int offset = limit.getOffset() != null ? ((Number) resolveValue(limit.getOffset(), false)).intValue() : 0;
                scanLimits = new ScanLimitsImpl(rowCount, offset, rowCountJdbcParameter + 1);
            } else if (top != null) {
                if (top.isPercentage() || top.getExpression() == null) {
                    throw new StatementExecutionException("Invalid TOP clause");
                }
                try {
                    int rowCount = Integer.parseInt(resolveValue(top.getExpression(), false) + "");
                    scanLimits = new ScanLimitsImpl(rowCount, 0);
                } catch (NumberFormatException error) {
                    throw new StatementExecutionException("Invalid TOP clause: " + error, error);
                }
            }
            if (maxRows > 0) {
                if (scanLimits == null) {
                    scanLimits = new ScanLimitsImpl(maxRows, 0);
                } else if (scanLimits.getMaxRows() <= 0 || scanLimits.getMaxRows() > maxRows) {
                    scanLimits = new ScanLimitsImpl(maxRows, scanLimits.getOffset());
                }
            }
            List<ColumnReferencesDiscovery> conditionsOnJoinedResult = new ArrayList<>();
            List<ScanStatement> scans = new ArrayList<>();
            for (Map.Entry<String, JoinSupport> join : joins.entrySet()) {
                String alias = join.getKey();
                JoinSupport joinSupport = join.getValue();
                Expression collectedConditionsForAlias = collectConditionsForAlias(alias, selectBody.getWhere(), conditionsOnJoinedResult, mainTableAlias);
                LOG.severe("Collected WHERE for alias " + alias + ": " + collectedConditionsForAlias);
                if (collectedConditionsForAlias == null) {
                    joinSupport.predicate = null;
                } else {
                    joinSupport.predicate = new SQLRecordPredicate(join.getValue().table, alias, collectedConditionsForAlias);
                }
            }
            for (Join join : selectBody.getJoins()) {
                if (join.getOnExpression() != null) {
                    ColumnReferencesDiscovery discoverMainTableAliasForJoinCondition = discoverMainTableAlias(join.getOnExpression());
                    conditionsOnJoinedResult.add(discoverMainTableAliasForJoinCondition);
                    LOG.severe("Collected ON-condition on final JOIN result: " + join.getOnExpression());
                }
            }
            for (ColumnReferencesDiscovery e : conditionsOnJoinedResult) {
                LOG.severe("Collected WHERE on final JOIN result: " + e.getExpression());
                for (Map.Entry<String, List<net.sf.jsqlparser.schema.Column>> entry : e.getColumnsByTable().entrySet()) {
                    String tableAlias = entry.getKey();
                    List<net.sf.jsqlparser.schema.Column> filteredColumnsOnJoin = entry.getValue();
                    LOG.severe("for  TABLE " + tableAlias + " we need to load " + filteredColumnsOnJoin);
                    JoinSupport support = joins.get(tableAlias);
                    if (support == null) {
                        throw new StatementExecutionException("invalid table alias " + tableAlias);
                    }
                    if (!support.allColumns) {
                        for (net.sf.jsqlparser.schema.Column c : filteredColumnsOnJoin) {
                            support.selectItems.add(new SelectExpressionItem(c));
                        }
                        support.projection = new SQLProjection(support.table, support.tableRef.tableAlias, support.selectItems);
                    }
                }
            }
            Map<String, Table> tables = new HashMap<>();
            for (Map.Entry<String, JoinSupport> join : joins.entrySet()) {
                JoinSupport joinSupport = join.getValue();
                tables.put(join.getKey(), joinSupport.table);
                ScanStatement statement = new ScanStatement(tableSpace, joinSupport.table.name, joinSupport.projection, joinSupport.predicate, null, null);
                scans.add(statement);
            }
            TuplePredicate joinFilter = null;
            if (!conditionsOnJoinedResult.isEmpty()) {
                joinFilter = new SQLRecordPredicate(null, null, composeAndExpression(conditionsOnJoinedResult));
            }
            Projection joinProjection = null;
            if (!allColumns) {
                joinProjection = new SQLProjection(tableSpace, tables, selectBody.getSelectItems());
            }
            TupleComparator comparatorOnPlan = null;
            if (selectBody.getOrderByElements() != null && !selectBody.getOrderByElements().isEmpty()) {
                comparatorOnPlan = SingleColumnSQLTupleComparator.make(mainTableAlias, selectBody.getOrderByElements(), null);
            }
            try {
                return ExecutionPlan.joinedScan(scans, joinFilter, joinProjection, scanLimits, comparatorOnPlan);
            } catch (IllegalArgumentException err) {
                throw new StatementExecutionException(err);
            }
        }
    } else {
        if (selectBody.getWhere() == null) {
            throw new StatementExecutionException("unsupported GET without WHERE");
        }
        if (joinPresent) {
            throw new StatementExecutionException("unsupported GET with JOIN");
        }
        // SELECT * FROM WHERE KEY=? AND ....
        SQLRecordKeyFunction keyFunction = findPrimaryKeyIndexSeek(selectBody.getWhere(), table, mainTableAlias);
        if (keyFunction == null || !keyFunction.isFullPrimaryKey()) {
            throw new StatementExecutionException("unsupported GET not on PK, bad where clause: " + selectBody.getWhere() + " (" + selectBody.getWhere().getClass() + ")");
        }
        Predicate where = buildSimplePredicate(selectBody.getWhere(), table, mainTableAlias);
        try {
            return ExecutionPlan.simple(new GetStatement(tableSpace, mainTable.tableName, keyFunction, where, false));
        } catch (IllegalArgumentException err) {
            throw new StatementExecutionException(err);
        }
    }
}

Example 4 with SelectExpressionItem

use of net.sf.jsqlparser.statement.select.SelectExpressionItem in project JSqlParser by JSQLParser.

the class SelectUtilsTest method testBuildSelectFromTableAndParsedExpression.

@Test
public void testBuildSelectFromTableAndParsedExpression() throws JSQLParserException {
    Select select = SelectUtils.buildSelectFromTableAndExpressions(new Table("mytable"), "a+b", "test");
    assertEquals("SELECT a + b, test FROM mytable", select.toString());
    assertTrue(((SelectExpressionItem) ((PlainSelect) select.getSelectBody()).getSelectItems().get(0)).getExpression() instanceof Addition);
}

Example 5 with SelectExpressionItem

use of net.sf.jsqlparser.statement.select.SelectExpressionItem in project JSqlParser by JSQLParser.

the class SelectASTTest method testSelectASTColumn.

@Test
public void testSelectASTColumn() throws JSQLParserException {
    String sql = "SELECT  a,  b FROM  mytable  order by   b,  c";
    StringBuilder b = new StringBuilder(sql);
    Statement stmt = CCJSqlParserUtil.parse(sql);
    Select select = (Select) stmt;
    PlainSelect ps = (PlainSelect) select.getSelectBody();
    for (SelectItem item : ps.getSelectItems()) {
        SelectExpressionItem sei = (SelectExpressionItem) item;
        Column c = (Column) sei.getExpression();
        SimpleNode astNode = c.getASTNode();
        assertNotNull(astNode);
        b.setCharAt(astNode.jjtGetFirstToken().beginColumn - 1, '*');
    }
    for (OrderByElement item : ps.getOrderByElements()) {
        Column c = (Column) item.getExpression();
        SimpleNode astNode = c.getASTNode();
        assertNotNull(astNode);
        b.setCharAt(astNode.jjtGetFirstToken().beginColumn - 1, '#');
    }
    assertEquals("SELECT  *,  * FROM  mytable  order by   #,  #", b.toString());
}